Infura product tips and Web3 tutorials for developers building decentralized applications.

Infura Developer Tutorials

Tutorials

Getting Started With Infura

Comparing NFT Standards - ERC-721 vs ERC-721a vs ERC-1155

Wanna be in the same league as Damien Hirst, DC, and Niftys? Then build your NFT
on the Palm network! 

Infura and Palm NFT Studio [https://twitter.com/PalmNft] are excited to announce
that the Palm network is now available to all users of Infura. Nearly 430,000
developers now have access to create NFTs on the Palm network. 

The Palm NFT Studio

The Palm network is an Ethereum sidechain dedicated to selling, purchasing, and
trading NFTs that are associated with real-world and digital assets. Palm
provides low gas costs and fast transaction finality. The network is over 99%
more energy efficient than Proof of Work-based blockchain networks, providing
artists with a more sustainable solution today, while Ethereum upgrades to Proof
of Stake in the Merge, tentatively scheduled for release in July 2022.

The Palm NFT Studio has collaborated with Damien Hirst
[https://palm.io/studio/damien-hirst-currency-nft-updates/], DC
[https://palm.io/studio/creating-a-sustainable-future-for-digital-fandoms/], 
Niftys and Warner Brothers
[https://palm.io/studio/niftys-launches-the-matrix-resurrections-nft-project-on-the-palm-network/] 
and other artists in minting NFTs on the Palm network. 

How to mint an NFT on Palm

For users looking to mint NFT projects, the Palm network provides an effective
solution to create NFTs that are able to be bridged back to Ethereum.

To access the Palm mainnet or testnet endpoints, here’s how to get started:

1. Login [http://infura.io/login] to your Infura account and select an existing
Ethereum project (or create a new Ethereum project
[https://docs.infura.io/infura/create-a-project] if you have not yet). 

2. Click on the settings of the project to view the Palm API endpoints
[https://docs.infura.io/infura/networks/palm/getting-started/accessing-palm-api-endpoints]
.

Using Palm mainet and testnet is free as part of all Infura plans, and requests
sent to the API count as part of your existing plan. No action is required to
activate Palm, and the availability of Palm testnet allows you to have an
environment to begin developing and testing your NFT project before going live. 

See our documentation on Palm [https://docs.infura.io/infura/networks/palm] for
more information, as well as links to helpful tutorials
[https://docs.infura.io/infura/networks/palm/tutorials].

Get in touch and start building

Interested in creating your own NFTs, but do not know where to start? 

Learn more from Infura’s Director of Engineering, Kris Shinn, on minting NFTs
using Infura and Replit [/minting-nfts-with-infura-and-replit/], based on his 
EthDenver 2022 [https://www.youtube.com/watch?v=kim7T4GDFOM] presentation. 

Let us know how you are using NFTs in our Discord and feel free to ask questions
in our community [https://community.infura.io/]. 

Just getting started with Infura? Our docs will get you building
[https://docs.infura.io/infura/].

Ethereum Network Updates, Upgrades, Hard Forks

Infura - Ethereum Network Updates

Network

The Palm network is now available for all NFT creators on Infura

Last July, we published Ethereum JavaScript Libraries: web3.js vs. ethers.js
(Part I) [/ethereum-javascript-libraries-web3-js-vs-ethers-js-part-i/] to
provide “a comparison of web3.js and ethers.js, focusing on their similarities
and differences, so that you can better understand the nuances of the
libraries.”

To recap, we dove into the documentation of both libraries. We then used a
modified version of a software evaluation framework Andres Canal established in
his article “Using Quill,js to Build a WYSIWYG Editor for your Website
[https://www.scalablepath.com/blog/using-quill-js-build-wysiwyg-editor-website/]
” to guide the reader toward making the best decision in choosing which library
to use.

The article was “written with the intent of educating developers to understand
the tradeoffs between the two libraries to be able to make a decision of which
library to use for their particular use case.”

How have the conclusions from that article changed over the course of the past
year?

Table 1: Comparison of Conclusions about Web3.js and Ethers.js

July 2020October 2021Web3.js has a community of users and maintainers associated
with the Ethereum Foundation. Web3.js has a good API reference and has been
around since 2015. Many projects are using it and the library has been the go-to
in many "Build Your First dApp" tutorials.Web3.js is best for those who prefer
the most-used Ethereum javascript library that is also maintained by a
blockchain-focused firm. Web3.js's strengths are its tests and community.
Documentation is currently modest in design and scope and can definitely be
improved.Ethers.js is excellent because it is a small, compact library with a
large number of test cases. It has good “Getting Started” documentation, making
it accessible to new users. Developers find ethers.js simple and intuitive and
the library has gained in popularity over the past two years, seeing increased
downloads and usage by projects.Ethers.js is best for those who prefer
lightweight, user-friendly libraries with robust testing and documentation.
Ethers.js’s strengths are its documentation, tests and community. It could have
more maintainers in order to create some redundancy in the development team -
currently a single individual.

Let’s dive into the updated data and explain why these conclusions have changed.

1) How important is the popularity of the library?
To use Andres Canal’s definition,

“A popular project on Github means exactly what you expect it to. Namely, that
there are lots of people questioning, contributing, and supporting it. This
activity tends to result in more reliable software. You can check the popularity
of any project by looking at how many stars it has, how many issues are opened,
how many pull requests are pending, and how many contributors worked on the
project.”

Web3.js has about 11,600 stars
[https://github.com/ChainSafe/web3.js/pulse/monthly] and ethers.js 3,100
[https://github.com/ethers-io/ethers.js/pulse/monthly] as of Oct. 14, 2021. 
Web3.js is used by 112,849 repositories
[https://github.com/ChainSafe/web3.js/network/dependents?package_id=UGFja2FnZS0xNTA1NzY4MA%3D%3D]
, compared with 65,519 for ethers.js
[https://github.com/ethers-io/ethers.js/network/dependents?package_id=UGFja2FnZS0xNjEzMjI4Ng%3D%3D]
.

Looking back to July 2020, Web3.js had nearly 8,800 stars while ethers.js had
nearly 1,500. Web3.js was used by 51,300 repositories on GitHub, compared with
18,500 for ethers.js. 

Web3.js remains the more popular library, but impressively for both libraries,
their dependencies have at least doubled over this time period. Web3.js remains
more popular, but the overall pie of dependent projects has grown from about
69,800 to 178,368. We will dive more into the dependencies in question 3.

2) How important is the maintenance of the library?
To quote ourselves from the last article,

“We want to use libraries that are updated frequently, so that bugs are squashed
and new features are added. Though it is not perfect, looking at a month (or
two) of commits, closed issues, active issues, and the number of maintainers
over that time period can give a sense of the strengths and weaknesses of an
open source project. This also reveals patterns of maintenance, giving some
insight to the user of a library when updates and bug fixes are generally
addressed, which can be used as a proxy metric for maintenance of the library.”

Using the same metrics from our last article, we see the following for both
libraries.

Table 2: GitHub Monthly Pulse for Sept. 14, 2021 to Oct. 14, 2021

LibraryCommits to Main BranchClosed IssuesActive IssuesMaintainersweb3.js2060107
10ethers.js217391
GitHub Pulse now reveals some additional useful information about the libraries,
which gives us even more context of why we are seeing what we are seeing.

For web3.js, we can see that a single individual is responsible for the majority
of the commits, though there are three individuals that have 10 or more commits.
This is something I see as a plus. This means there is redundancy built into the
development team, in case someone were to stop contributing to the project.
Web3.js has 121 commits to branches other than the main branch, as web3.js is
transitioning off of the 1.x version as outlined in this blogpost the roadmap
for web3.js
[https://medium.com/chainsafe-systems/the-future-of-web3-js-v3-0-0-release-ecc9feecb2de] 
(which we will reference again in the next section). This indicates a lot of
work is going into the future releases.

For ethers.js, Richard Moore continues to be the sole maintainer of the library,
but there are many more people contributing to the project by opening and
closing issues on the GitHub repository, indicating that there is a community of
individuals committed to the health of the library. By virtue of a single
maintainer, it is not surprising to see fewer overall commits.

3) Who is responsible for the development of the library and how many projects
use it?
ChainSafe [https://chainsafe.io/] is the lead maintainer of the web3.js library, 
having received a grant from the Ethereum Foundation to “continue the
maintenance and further development”
[https://medium.com/chainsafe-systems/chainsafe-receives-grant-from-ef-for-web3js-9e4376f5f36a] 
of web3.js in September 2020. ChainSafe’s outline of the future plans for
web3.js
[https://medium.com/chainsafe-systems/the-future-of-web3-js-v3-0-0-release-ecc9feecb2de]
reveals major changes coming, such as the deprecation of web3-bzz and web3-shh
packages in version 3.x and an eventual move to Typescript in version 4.x. These
are exciting additions, but the tradeoff is that ChainSafe will need time to
realize these while maintaining the existing library.

Ethers [https://ethers.org/] is the lead maintainer of the ethers.js library,
which is Richard Moore’s project, so we can think of Richard Moore = Ethers.
Ethers has been the lead maintainer of the project since the inception of it.
This can be a risk for some projects, but in this case, it has made ethers.js
very quick in adding features and capabilities. For example, ethers.js is fully
TypeScript-ready with “definition files and full TypeScript source” according
to
the documentation [https://docs.ethers.io/v5/#features]. 


Table 3: Dependent Repository and Package Counts, October 15, 2021

LibraryDependent RepositoriesDependent Packagesweb3.js113,0184,685ethers.js
66,9503,505

Web3.js, likely due to the longer existence of the project, has more
repositories and packages that are dependent upon it. When compared with metrics
from our last article, ethers.js is closing the gap with web3.js when it comes
to dependent packages.

4) How important is it that the library has tests?
Answer: Very important to any dApp developer worth their salt. Luckily for us,
both libraries have gotten even better since our last article.

Ethers.js has a test suite API documented for the current v5 release on their
GitHub repository
[https://github.com/ethers-io/ethers.js/tree/master/docs/v5/testing]. The
documentation of the testing is very impressive
[https://docs.ethers.io/v5/testing/]. Check it out.

Web3.js has added test documentation
[https://github.com/ChainSafe/web3.js/blob/1.x/TESTING.md] since our last
article. This documentation, based on my personal inspection, appears robust and
clearly written.

I believe ethers.js has the lead, but web3.js has done a great job catching up
in terms of its tests and their documentation, and I feel both have great
coverage when it comes to tests. Tests are a strength for both libraries now.

5) How important is the number of downloads of the library?
As of Oct. 15, 2021, web3.js has 30,767,910 downloads
[https://npm-stat.com/charts.html?package=web3&from=2015-01-01&to=2021-10-15] 
and ethers.js has 24,284,490 downloads
[https://npm-stat.com/charts.html?package=ethers&from=2015-01-01&to=2021-10-15].
Compare that with May 20, 2020, when we first looked at this statistic, when
web3.js had 14,703,432
[https://npm-stat.com/charts.html?package=web3&from=2015-01-01&to=2020-05-20] 
downloads and ethers.js had 8,500,336
[https://npm-stat.com/charts.html?package=ethers&from=2015-01-01&to=2020-05-20]
downloads. The overall pie has grown, but the difference in downloads is
surprisingly close: a difference in total downloads of 6,484,420 on Oct. 15,
2021 compared with a difference of 6,203,096 in late May of 2020. 

When we look at weekly downloads, the two libraries are practically even: 
web3.js at 330,102 [https://www.npmjs.com/package/web3] and ethers.js at 339,318
[https://www.npmjs.com/package/ethers]. Weekly downloads of both libraries have
nearly doubled since we last checked this statistic (May 20, 2020, for those
following along): web3.js at 175,661 [https://www.npmjs.com/package/web3] and
ethers.js at 184,798 [https://www.npmjs.com/package/ethers].

6) How important is web performance?
Web performance is indirectly measured by comparing the size of the libraries,
as we are assuming smaller libraries take less time to load in the browser. 

Both libraries are small. Web3.js has decreased the size of the library to 7.28
MB [https://www.npmjs.com/package/web3] unpacked (unpacked refers to the size of
the library when published) from 10.6 MB when we last checked. Ethers.js touts
its very small size, which has increased to 322 kb uncompressed
[https://www.npmjs.com/package/ethers] from 284 kb uncompressed over the same
time period. It’s unclear what occupies 322 kb within ethers.js. NPM shows
ethers.js 10.2 MB unpacked, and I confirmed this when I downloaded to my
personal machine and calculated the size of the ethers.js package using the
Finder application on Macs. So we have to take ethers.js's word that it is small
in size, which is a big plus, though I do need to do further research to confirm
this claim is valid.

7) How important is the quality of the documentation?
Ethers.js is the clear winner when it comes to the quality of the documentation
of the library and it stands out for three key reasons.

 1. Ethers.js has an extensive “Getting Started Guide,” which helps a user
    orient themselves to both the library and the vocabulary of Ethereum.
 2. Ethers.js has useful call outs and additional information provided as part
    of the documentation, giving the end user visual cues, convenient links, and
    other helpful user experience features that make reading and using the
    documentation an enjoyable experience.
 3. Ethers.js documentation has an extremely useful feature - a toggle to single
    page view, in which all documentation is provided on a single page. This
    makes using “Ctrl + f” in the documentation a breeze, and helps with finding
    the method you are looking for quickly.

Web3.js has not had many visible changes to the documentation since our last
article and could use an update to make the user experience more pleasant.

An indirect additional comment on the documentation - ethers.org provides a very
helpful “playground,” where you can try out the library in browser: 
https://playground.ethers.org/. This useful feature lets a user get started
playing around with the library quickly and easily. While it could be argued
that remix.ethereum.org provides a similar playground experience for web3.js,
this is not the goal of remix, and remix support ethers.js as well.

8) How important is the overall usage of the library?
The last time we looked at the numbers, web3.js was the clear winner in overall
usage, with ethers.js gaining users at a rate that appeared that it would only
be time before ethers.js caught up to web3.js. The results today show that both
have healthy ecosystems and a large number of users. My personal belief is that
the overall growth of the ecosystem shows that both libraries have been adopted
by a significant number of projects and users. So, while web3.js has more
downloads, stars, and overall metrics, ethers.js is competitive to web3.js in
its usage. It’s fair to say both have been widely adopted.

9) How important is the license?
This is one area that has not changed since we last reported. Web3.js still has
the LGPLv3 license and ethers.js the MIT license. I am not a lawyer, and so this
is the hardest area for me to pick a winner. It is worth reviewing Slava
Todavchich’s article “Understanding open-source and free software licensing
[https://medium.com/@moqod_development/understanding-open-source-and-free-software-licensing-c0fa600106c9]
,” which we suggested in our July 2020 blogpost.

But wait... there is a new category!

10) How important is the community and community experience?
Yes, I am adding a new way to evaluate the two libraries, based on my experience
in Developer Relations and Software Community. I am personally looking for
robust channels where developers using the software can interact with one
another, find information about updates and hotfixes, share their use cases and
help each other debug their code. The best software projects provide this for
their users and it is a differentiating factor.

Web3.js and ethers.js have both embraced Discord as a means to communicate
directly with their community of developers. Web3.js lives within the ChainSafe
Discord Server, in the channel #web3js-general. Web3.js has used this channel
not just to interact with developers, but  as of September 2021, to promote a
web3.js developer survey to help drive the direction of changes for version 4.x
of web3.js. Ethers.js utilizes the EF JavaScript Team Discord Server, in the
#ethers channel. Both are active channels with communication on a daily basis.

Both also use Twitter to communicate changes to their audiences, though both
have relatively light follower counts. @web3_js [https://twitter.com/web3_js] 
(1,250 followers) and @ethersproject [https://twitter.com/ethersproject] (1,279
followers) only tweet to announce updates and changes to the libraries, serving
as another way for notifications about updates to get through to developers.

ChainSafe also uses their Medium account to post some updates
[https://medium.com/chainsafe-systems] about web3.js, though not a regular
cadence.

GitHub continues to be a source of discussion for communities of both libraries,
though the shift to Discord by both reflects a growing trend in the Ethereum
community, as well as in software communities in general, to commit to this tool
for a mix of synchronous and asynchronous communication.

The verdict is that both take development and interaction with their communities
seriously.

What’s the next step? 

You should go ahead and test out the libraries themselves with Infura, and we
created a tutorial for just this purpose: Ethereum JavaScript Libraries:
web3.js
vs ethers.js (Part II)
[/ethereum-javascript-libraries-web3-js-vs-ethers-js-part-ii/]. The best way to
see if my evaluation is valid is to kick the tires on both libraries.

In conclusion, instead of declaring a winner, it seems that Ethereum itself is
benefitting from having two leading JavaScript front-end libraries. More
libraries being built that can utilize the features of web3.js and ethers.js
will push them to be even better (like web3-react
[https://github.com/NoahZinsmeister/web3-react], for example). In updating this
article, I have been struck by the growth of downloads and dependencies of both
libraries, making me of the opinion that you can choose either and feel
comfortable with the decision. I hope this illuminated some ways you can
evaluate both to choose what works best for you.

Get started [https://infura.io/register] building on Infura for free today.

Ethereum JavaScript Libraries: Web3.js vs Ethers.js: An Update

As the clock ticks down to the Merge, the Teku and Infura teams have continued
refining their collaboration. In case you missed it, these two teams have
created an eye-poppingly fast Ethereum 2.0 client sync experience
[https://consensys.net/blog/teku/teku-and-infura-team-up-to-make-the-fastest-ethereum-2-0-client-sync/]
. Since then, they have continued refining their integration and made some
important discoveries and improvements.

Attestations with Teku
One of those discoveries was that validators linked to a remote beacon node
could have significant performance issues: specifically, a lot of missed
attestations. Obviously, this is a pretty crucial issue. It turned out to be not
just a problem with a remote beacon node, but specifically a remote beacon node
behind load balancers, including Infura’s load balancers. 

If you’re interested in the blow-by-blow, check out the Github issue here
[https://github.com/ConsenSys/teku/issues/4090].

The solution the team came to was to implement an option to disable early
attestation publishing when the block is received: 

--validators-early-attestations-enabled[=<FALSE>]

Find the full Teku documentation on this issue here
[https://docs.teku.consensys.net/en/latest/Reference/CLI/CLI-Syntax/#validators-early-attestations-enabled]
.

This option allowed validators connecting to Infura beacon nodes to have
performance equivalent to validators connected to a local beacon node, which in
and of itself is impressive. It would appear that this is a fix not just for
nodes connecting through Infura, but for any context where Teku validators are
using load-balanced beacon nodes.

The second innovation the team has made surrounding attestations is batch 
attestations. This consists of sending all attestations produced for a given
slot to the beacon node in a single batch. In the context of Infura, this allows
running a lot more validators without hitting rate limits.

The future of history
Another feature that the team has been working on, which isn’t quite ready yet
for a full release, is an innovative way to store historical state without
having a hard drive the size of the Library of Alexandria. 

With increasing adoption of decentralized technology, there is more and more
demand, and even novel use cases, for historical chain data. The most
top-of-mind for many in the space is tax compliance. Institutions and even
individuals are increasingly in need of solutions for being able to query,
quickly and cheaply, historical chain data.

Like most great things in this space, the solution being developed uses Merkle
tries. Without getting too deep into the woods (pun intended), as it’s not
finished yet, the technique essentially takes the difference between slots and
stores the branch updates. The applicability for this is tremendous, so watch
this space for more updates.

Safety through Diversity
As we approach the reality of Ethereum 2.0, more and more voices are calling out
a topic of vital importance: client diversity. The Ethereum Proof of Work
consensus mechanism is, at this point, venerable and battle-tested, at least in
blockchain terms, and is resistant to 51% of attacks. As the network transitions
to Proof of Stake, the threat remains that a single Ethereum client will be
running on a majority of validator nodes. This opens the door not only for a
malicious attack, but also for single points of failure bringing down the entire
network. 

For more explanation, check out this very readable primer
[https://blog.ethereum.org/2020/08/21/validated-why-client-diversity-matters/] 
that should bring a lot of issues into focus. There are so many reasons to make
the move to a Proof-of-Stake consensus model, and the network is on track to do
so. It would be a stunning failure of vision and quite simply, wildly unsafe to
move Ethereum to a PoS network that has a majority of any Ethereum client. 

Even if we were to assume that all clients were going to act in the best
interests of the network as a whole, which in and of itself is a leap most
aren’t willing to take, the Ethereum network is a sprawling global entity with
external dependencies. No client should be able to be a single point of failure
for the entire network. 

As we build the Beacon Chain and validators up and out, client diversity must be
included as an essential consideration.

Learn more about Infura’s Eth2 API [https://infura.io/docs/eth2] here and sign
up [https://infura.io/register] for a free account.

Teku + Infura to 2.0: How to Handle Attestations

SoK: Validating Bridges as a Scaling Solution for Blockchains

So, why would you need a hybrid infrastructure model alongside Infura? 

Let’s think about how your database is set up. You probably have your own
database, which is great. What happens if that database goes down? Would your
app continue to run seamlessly, delivering the experience you want your
customers to get? Or, would your database shutdown cause outages and crashes in
your app? 

If the dataset you’re hosting is a public dataset, you have a new paradigm for
making your infrastructure much more resilient and reliable by integrating
Infura into your overall strategy. Infura implements a reverse proxy pattern
internally and can be a highly reliable and performant node in your
infrastructure stack, allowing you the ability to have a portion (or all) of
your traffic routed to Infura. 

You can choose to keep your database as your primary database with Infura as a
backup, or vice versa. In this way, Infura will act as an always-on backup for
your database, providing a level of flexibility previously not available with a
single database running. 

You also have the opportunity to use Infura as a stats comparison tool to make
sure your performance is up to par. Alternatively, you may need to handle more
load (request traffic) than your infrastructure can currently handle. You can
route the overflow to an Infura project ID to handle spikes in traffic so your
service stays up and running. 

There are many opportunities for you to use Infura alongside your own in-house
node infrastructure to improve your user experience. Let’s dive a little deeper
on how we accomplish this.

What does it mean when Infura implements a reverse proxy pattern?
Let’s review what a normal proxy is first, and then we’ll flip it and reverse
it, a la Missy Elliott, to talk about the reverse proxy. A proxy server (or web
proxy or forward proxy) is a server located in front of a group of client
machines (computers). When those computers make requests, the proxy server
intercepts those requests and communicates with the target web servers on behalf
of those clients. Basically, a proxy is a fancy word for a request/response
middleman. 

If you’re a visual learner, here’s a diagram from Cloudflare that shows just
where that forward proxy sits:

What is a reverse proxy? 
A reverse proxy is a server that typically sits on the edge of your
infrastructure. It is responsible for receiving requests from web clients and
subsequently routing them to one or more backend web servers. 

Here’s another great diagram from Cloudflare to show how the reverse proxy fits
in to the whole flow:




One of the main reasons to use a reverse proxy server is load balancing,
ensuring the flow of traffic between clients and servers remains smooth. This is
one of the main advantages of using both your own node and Infura. In addition,
it allows you to cache content and provides web acceleration for improved
performance. Lastly, reverse proxies allow for more efficient, secure SSL
encryption and protection from DDoS attacks and related security issues. 

As we previously mentioned, Infura can be used as a reverse proxy to assist with
ensuring the flow of traffic for your clients and servers stays as smooth as
possible, making for a more enjoyable user experience.

Some examples of a reverse proxy in action
Let’s first look at how we can set up a very simple reverse proxy using Caddy. 

We will use our localhost and a backend HTTP service running on 127.0.0.1:9000
to make sure we’re getting our reverse proxy working correctly. 

First, download Caddy [https://caddyserver.com/]. Once that’s downloaded, check
out their Getting Started guide here
[https://caddyserver.com/docs/getting-started]. Or, follow along to learn how to
set up a simple reverse proxy! 


At this point, you may be running your own node, but since it takes too long to
sync one for this article, we can substitute with a simple NodeJS stub to check
that our reverse proxy is working correctly. I simply named mine main.js.


const http = require('http');

const hostname = '127.0.0.1';
const port = 9000;

const server = http.createServer((req, res) => {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   res.end('Reverse proxy success!\n');
});

server.listen(port, hostname, () => {
   console.log(`Server running at http://${hostname}:${port}/`);
});


This sets up a backend HTTP service running on 127.0.0.1:9000 mentioned earlier
and will display a “Reverse proxy success!” message if our proxy is working
correctly. To start this, run `node main.js` in a different terminal window and
leave that connection open! 

Next, we will want to create a Caddyfile
[https://caddyserver.com/docs/quick-starts/caddyfile] (literally create a new
text file in whatever directory you’re working in and name it Caddyfile). Once
you have that set up, we will set up our simple reverse proxy itself inside the
Caddyfile with just two lines: 

localhost 

reverse_proxy 127.0.0.1:9000


In this instance, reverse_proxy is where we want to get our information from
(the original site), and localhost is where we are redirecting to using our
reverse proxy. 

Now, from the same directory as your Caddyfile in a new terminal window from
your `node main.js`, run:

caddy run


This will start the caddy server and will allow your reverse proxy to work! Now,
you’ll notice when you run this that you don’t see the “Reverse proxy success!”
message popping up. 

That’s because this just started the server. You now need to make a request to “
https://localhost” and you’ll see the message. To do this, open another terminal
window (that makes three now, for those of us keeping track), and simply run:

curl https://localhost


Running this command will give you the “Reverse proxy success!” message we were
looking for, and now you know you’ve successfully set up a simple reverse proxy. 

Enter Infura!
Now that we’ve gotten a basic reverse proxy up and running, let’s try one using
an Infura endpoint. We will keep our overall setup of using a Caddyfile the
same, but we won’t need the backend HTTP service running in the background, as
that will be switched to an Infura endpoint. 

We’re going to change up how our Caddyfile looks:

localhost 

reverse_proxy https://rinkeby.infura.io {
   header_up Host {/v3/<YOUR_PROJECT_ID>}
}


You will notice that we’ve added in a “header_up Host” inside the reverse_proxy 
section. This allows us to include our Project ID to both the Rinkeby endpoint
and the localhost endpoint we are proxying to. 

To test this out, we will need to send a request, so I used web3_clientVersion 
as an example: 

curl https://localhost/v3/<YOUR_PROJECT_ID> \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"web3_clientVersion","params": [],"id":1}'


When we run this, we get the following output: 

{"jsonrpc":"2.0","id":1,"result":"Geth/v1.10.8-omnibus-aef5bfb3/linux-amd64/go1.16.7"}


Cool! But how do I know my reverse proxy is working? Well, if you switch out
`localhost` in our curl command to `rinkeby.infura.io`, you get the same output,
which shows that our reverse proxy is running properly.

How do you use Infura as a backup for your own node?
We’re going to set things up initially the same as we did in the previous
example but with two upstreams, one to our localhost and the other to the Infura
node. 

Next, we’re going to set up load balancing. Now, what’s load balancing? Load
balancing acts like a traffic cop sitting in front of your application servers,
routing client requests across all the servers that can fulfill those requests
quickly and efficiently. 

So how do we set that up?

Since we’re using Caddy, we can refer to their docs
[https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#load-balancing] 
for the basics of how to use more than one upstream. When we look at lb_policy,
there are many ways to determine which upstream Caddy will use first. Caddy will
default to using the first listed upstream and will move down the list if the
servers stop responding. In our example, we want to have localhost:9000 from our
main.js file be the first upstream, meaning we want our reverse proxy to send
the data through our localhost first, so we will identify that by putting it
first in our list of upstreams (we will leave our Infura Rinkeby endpoint in as
the second upstream): 

localhost

reverse_proxy localhost:9000 https://rinkeby.infura.io {
   header_up Host {/v3/66172ed429624788ac264604755ba42c}
}


Since we are using the localhost:9000 port, we want to get that server back up
and running. In another terminal window, start the Node server with node main.js
.

To make sure everything is set up correctly, let’s run our request through by
running the same request from earlier but with the :9000 port included,
expecting to get the “Reverse proxy success!” message:

curl http://localhost:3000/v3/<YOUR_PROJECT_ID> \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"web3_clientVersion","params": [],"id":1}'


and we get the following output: 

Reverse proxy success!


Excellent! Now, how do we incorporate the Infura endpoint to be a fallback? 

You’ll notice we left the Infura endpoint in our Caddyfile where it originally
stood and we asked our proxy to load balance using the first upstream (our
localhost), which was how we got that “Reverse proxy success!” message. 

Now that we confirmed that we set everything up correctly on our end, we’re
going to kill the localhost server, mimicking what would happen if your private
node went down. Once we do that, our requests should automatically start routing
to the Infura node and we should get something similar to the below output:

{"jsonrpc":"2.0","id":1,"result":"Geth/v1.10.8-omnibus-aef5bfb3/linux-amd64/go1.16.7"}* Closing connection 0


But wait! We don’t get that! Instead, we get an error message. 

This is because Caddy only allows us to use either two HTTP or two HTTPS
endpoints - in our case, localhost is HTTP and our Infura endpoint is HTTPS. 

Luckily, there is a tool we can use to make this work with localhost that will
create a TLS certificate and sign it with a CA trusted locally by your device
and browser. That tool is called mkcert [https://github.com/FiloSottile/mkcert],
and it’s incredibly easy to install by following these steps
[https://web.dev/how-to-use-local-https/]. 

Keep in mind if you’re doing this with your own private HTTPS node, you likely 
will not need this additional step. 

If you are following our tutorial step-by-step (using localhost), be sure to
follow all the steps, including updating your main.js file to the below to
include the HTTPS requirement and the options constant. 

const https = require('https');
const fs = require('fs')
const options = {
   key: fs.readFileSync('<PATH_TO_CERTIFICATE-KEY_FILE>.pem'),
   cert: fs.readFileSync('<PATH_TO_CERTIFICATE_FILE>.pem')
};

const hostname = '127.0.0.1';
const port = 9000;

const server = https.createServer(options, function(req, res) {
   res.statusCode = 200;
   res.setHeader('Content-Type', 'text/plain');
   setTimeout(() => {res.end('Reverse proxy success!\n');}, 1000)
});

server.listen(port, hostname, () => {
   console.log(`Server running at https://${hostname}:${port}/`);
});


When you run the mkcert localhost command from the tutorial, the certificate key
file and certificate file used in the code above will be created.

Now that we have our localhost running with HTTPS, we can continue! Since we are
running everything with HTTPS, we need to update our Caddyfile to reflect those
changes.

localhost:3000 

reverse_proxy https://localhost:9000 https://rinkeby.infura.io {
   header_up Host {/v3/66172ed429624788ac264604755ba42c}
}


Now that we have all our files in order, let’s make sure our Node.js server is
running and send that request again. 

curl http://localhost:3000/v3/<YOUR_PROJECT_ID> \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"web3_clientVersion","params": [],"id":1}'


What do we get?

Reverse proxy success!


Perfect! That’s exactly what we want to get, as we have asked our reverse proxy
to go to https://localhost:9000 first. 

Now, what happens if we kill the Node server and send our request again?
Remember last time we did this, we got an error message. This time we should be
getting the result from our Infura Rinkeby node:

{"jsonrpc":"2.0","id":1,"result":"Geth/v1.10.8-omnibus-aef5bfb3/linux-amd64/go1.16.7"}


Success! 

Our reverse proxy is, in essence, ignoring the localhost node, as it’s not
functioning, and is defaulting to the Infura Rinkeby node! 

Super easy, right? Now you know how to use Infura as a backup node to keep your
services up and running smoothly!

Where can I learn more about reverse proxies?
Take a look at our client story from MakerDAO
[https://infura.io/customers/maker]. They currently use Infura for a multitude
of reasons, including using us as a backup node solution to ensure all
developers can use the MakerDAO toolkit! 

Another great example is the Polygon PoS network
[https://infura.io/docs/ethereum#section/Network-Add-Ons/Polygon-PoS]. We
initially began working with Polygon to share some traffic load for their
network, allowing users to access the Polygon networks via Infura endpoints and
effectively ensuring their network remains fast and functional, regardless of
traffic spikes they may see. We have since increased our partnership so we are
now handling 100% of their network traffic. 

Check out this blog post
[https://consensys.net/blog/developers/how-to-save-time-on-devops-and-scale-with-infura-lessons-from-leading-ethereum-dapps/] 
highlighting multiple companies across all verticals using a hybrid
infrastructure model of their own nodes plus Infura. Get some ideas on how we
can help you accomplish your needs, from verifying transactions to providing
backup database services! 

If you would like to run an Infura node in addition to your own, sign up
[https://infura.io/register] for a free trial today.

How to Run Your Own Node AND an Infura Node

When enterprise developers build dapps on Ethereum, they often have to consider
the entire tech stack and development process. The list of considerations range
from application features such as Web2 interfaces to deployment, which is
usually on a permissioned network hosted by a preferred cloud provider. Since
most full-stack software engineers build off of SDKs and API calls, it’s
important to establish the value of the application with consideration of the
deployment network.


Get the best of both Web2 and Web3 worlds
Many enterprise blockchain business cases build on the principles of traditional
Web2 development. Web2 focuses on operating with a fluid user experience with
attention to detail on scalable and responsive code on multiple devices. A
valuable decentralized application (dapp) in Web3 redesigns the economics and
industry roles while building on complementary existing systems -- instead of
fully replacing those systems with analogous Web3 features. 

Say you would like to reinvent a syndicated loans issuance platform such as
IPREO. This effort would require significant IT resources to spin up a minimum
viable product from the ground up if you’re recreating features like tranche
issuance calculations or calendar date exceptions. Instead, consider a path to
lesser resistance: blockchain modules that connect these digital assets to new
liquidity networks. The functionality is a re-issuance of an existing financial
instrument to ABC network with a listing on XYZ automatic market maker rather
than the full end-to-end dashboard.

To connect to pockets of liquidity, an enterprise developer must deploy with the
same smart contract language that is compatible with the Ethereum Virtual
Machine (EVM) and look to bridge the assets to networks with the desired
investor and issuer markets.

Why build on public Ethereum?
Until now, publishing enterprise dapps on Ethereum requires significant system
integration, executive buy-in and high set-up costs. Recently, we have seen more
public blockchains working with enterprises to cover non-functional technical
needs in order to meet minimum requirements of security audits and performance.
However, the relatively tribal nature of the blockchain developer subculture
means that mainstream enterprises are still conservative when it comes to
building on Ethereum.

If you are an enterprise developer, consider the following advantages of
building on public Ethereum vs. permissioned networks:

1. Faster setup and lower total cost of ownership

2. Immutability and longevity of the data stored with thousands of independent
nodes

3. Composability and low barrier of entry to decentralized finance (DeFi)



1. Faster set-up and lower total cost of ownership
This is a standard private blockchain journey for a consortium:

After you develop your dapp, a lot of time is focused on node deployment
adhering to enterprise software standards. On the business side, you are also
trying to build a consortium to agree on the benefits and adoption before the
tech is tested. 

The consortium model usually chooses a separate tech vendor that does not have
single ownership from one consortium member to prevent conflicts of interest.
The tech vendor determining deployment and long-term support likely runs the
Ethereum nodes on behalf of participants. This will get the product to market
faster and focus on the business benefits. 

The last step involves time and licenses for adding more nodes and mutualizing
infrastructure costs across participants. Compared with private networks that
remove tokens from their operation, public networks require ownership of native
tokens to fund transactions. This gas cost pays for the infrastructure -- third
parties running full nodes and running operations for mining/validating. In my
time building enterprise projects, we have never seen this happen.

The public journey is much more straightforward. After you develop your dapp,
the deployment is a choice between public networks with updated configurations
on your Truffle setup. The added complexity is the gas costs for funding and
running your transactions on this network. 

To simplify connectivity to EVM-compatible networks, you can use Infura’s 
Ethereum API [https://infura.io/product/ethereum] to connect your app instantly
with a single line of code. Simplify your transaction management with Infura
Transactions (ITX)
[/why-you-should-use-infura-transactions-instead-of-building-your-own-in-house-relayer/] 
using prepaid accounts without holding ETH on your balance sheets. ITX is a
transaction relayer that manages your transactions to prevent dropped or stuck
transactions.

You will also likely want to work with a team such as Diligence that can audit
your contracts and monitor them when they’re live.

Public Ethereum has an overall lower total cost of ownership when you compare
the operational cost of running a system on mainnet rather than focusing on the
ownership and maintenance of the network itself. 

A consortium may have more control in the private chain and face less security
and treasury reviews at first. However, your infrastructure overhead and
negotiations on consortium network matters tend to outweigh the convenience and
added features of connecting to mainnet.

2. Immutability and Longevity
The Ethereum mainnet is secured by the interaction of thousands of independent
nodes run by individuals and miners throughout the world. Private chains
typically have a small number of nodes controlled by one or a few organizations.
Those nodes can be tightly controlled, but only a few need to be compromised in
order to rewrite the chain or commit fraudulent transactions.

At ConsenSys, we’ve recommended public networks to enterprise developers for
their resilience of replicated data as you are able to recover more quickly with
a larger network of more than 15,000 independent nodes. The more peers you have,
the easier it is to find a seed and fully recover your recorded transactions. In
consensus decisions, the more blockchain validators there are to verify
transactions, the more difficult it is to coordinate a majority decision that
may lead to an attack. 

In a permissioned network, the security is governed by the node with the least
security. Your network is only as secure as the weakest link. Any added nodes to
the network may also increase the surface area of attack. Most institutions will
recommend a base software security test in order to join as a full node owner.
The node owner will have to pass standard penetration testing to prevent any
hacking on the node in case it is a bad actor to the entire network.

3. Composability and Low Barrier to Entry on DeFi

The Ethereum network powers a vibrant ecosystem of third party applications and
technology including DeFi and NFTs. A highly composable and interoperable system
allows you to connect to DeFi to build financial products that enable and
combine multiple apps to match specific user needs. The Ethereum mainnet offers
enterprise developers the ability to gain access to market liquidity and provide
innovative ways for users to participate in the exchange, trading or growth of
that liquidity. 

When we say composable, it’s much more than just an open banking API. It’s a set
of open source live protocol contracts that can be called and extended. We’ve
seen pure forks of open source code like with Uniswap to get sushiswap. The
market has seen countless copies of DeFi models such as Compound and Aave, and
it doesn’t look like things are slowing down anytime soon. 

There’s more and more real value happening in DeFi leading us to believe that
cryptocurrencies are not a fad. It is here to stay.

Watch Clemens’ presentation “Pitching Public Ethereum to Enterprises”
[https://www.youtube.com/watch?v=EgbzVFfdZyg] at EdCon 2021.

Interested in building on Ethereum? Contact us [https://infura.io/contact]to get
support on starting your enterprise project.

3 things enterprise developers should consider when deploying on Ethereum

Are you excited by blockchain but don’t have a great deal of experience coding?
It can be easy to fall down a rabbit hole of technical tutorials that make
assumptions regarding your initial development knowledge. A particularly
important topic to grasp is basic security within your code. 

As you begin to build out your very own dApp, you will have to include
information such as an Infura API key, along with a mnemonic. 

If you are new to coding, this is the equivalent of giving a stranger your
social security number and keys to your home. Once this information is public,
there is no definitive way to ensure it hasn’t been captured by a person or web
crawler, which could result in malicious behavior. 

So, how can we address this? 

Thankfully, we can use dotenv along with git to protect our sensitive
information within our project when / if we push to github.

Dotenv is a zero-dependency module that loads environment variables from a .env
file into process.env, storing configuration in the environment separate from
the code. It is often a convention for environment variables to be stored in a
.env file or other mechanisms based on the server you are using. 

Note: This article will focus on building out a project using Truffle
[https://www.trufflesuite.com/] and Infura.

In our project, we will need to run the following command:

npm i dotenv

Once the process in our terminal has been completed, we will want to make sure
we have the dependency successfully installed. Head over to your package.json
file and check to ensure that dotenv has been added under dependencies.

Next, at the root of our project, let’s create a .env file: 

Here is where you will add all of the sensitive information that should not be
shared. 

We will make sure we can access our .env information in our truffle.config file.
At the top of the truffle.config file, add the following: 

require("dotenv").config

This will tell your project to load anything that is in the .env into an
environment variable, granting you access to it. 

Now, instead of having to put our Infura api key or mnemonic in an exposed file,
we can import that information from our .env file. 

When it comes to gaining access to our project key we are going to use, sign up
to Infura [https://infura.io/register] and create a project. In your dashboard,
you should see something similar to this: 

The following code is an example between the usage of .env and exposed
information within truffle.config: 

const HDWalletProvider = require('@truffle/hdwallet-provider');
const infuraURL = 'https://rinkeby.infura.io/v3/<project id here>'
const mnemonic = "Your mnemonic here"

rinkeby: {
provider: () => new HDWalletProvider (mnemonic, infuraURL),
network_id: 4,
gas: 5500000,
confirmations: 2,
timeoutBlocks: 200,
skipDryRun: true
},

Imagine if you pushed this up to github. Anyone would have the ability to open
your truffle.config file could take advantage of your exposed mnemonic and
project id from Infura. 

Let’s take a look at that same code and implement better security practices. 

Notice how we are calling upon the information without having to directly add to
our file.

One important detail, as of now even with an .env file: if you push this project
to github, it will show the .env file, which would defeat the purpose! 

Take a look for yourself.

This is where .gitignore comes into play. We will need to create a .gitignore
file, so we can push this project up to github.

Without getting into git, a quick summary could be git is version control
software that keeps track of all of your files and the versions of them. What
.gitignore does is it tells git not to keep track of this file along with
everything it contains. 

If you want to dive deeper into git along with other foundational material, have
a look at our Basic Training
[https://courses.consensys.net/courses/bootcamp-basic-training], a free course
that helps ensure you have the fundamental tools when developing. 

At our root (similar to the level our .env file lives), we will create a
.gitignore. Inside of that file, we will add .env along with any other files you
would rather not be pushed to github. 

We can now push our project up to github and notice that our .env file is no
longer exposed. Our sensitive information is now much more secure. 

If you are experimenting with this, make sure you add your .env file to your
.gitignore before pushing. 

If you are running into issues, remember gitignore ignores only untracked files.
If your files were committed in the past, they are now tracked by git. To ignore
them, you first need to delete said files, git rm them, commit and then ignore.

Otherwise, you can delete the .env file and run 

Git rm .env --cached

Here
[https://docs.github.com/en/github/authenticating-to-github/keeping-your-account-and-data-secure/removing-sensitive-data-from-a-repository] 
is a helpful link discussing the removal of sensitive data from a repo if it was
previously committed and discusses how to clean the git history. Savvy attackers
don't just look at the most recent repository info, they'll look at the history
of it as well.

Note: If you come across it in documentation, a question you might have is
“What is env. example”

An env. example file, on the contrary to this tutorial, is actually included in
the repository, it is used as an example file for you to know what KEY=VALUE
pairs you need for your project. Most often, it is used to copy the .env file
and then change the values. 

Example of execution: 
Enter to the project root directory using your terminal.

Check if .env the file exists or not.

If the file does not exist then create a file named .env.

Now execute the command

cp .env.local .env.

So the .env.sample file has all the ENV declarations defined but without their
values. It helps other developers establish/set up the project without having to
reverse-engineer the codebase.

So after git clone, you usually execute the command `cp .env.sample .env` and
fill in the values with the Infura credentials as we saw in the example above. 

Note: When you create a new repo using github, if you scroll down you should see
the option to include a .gitignore file so you don’t have to create one yourself
in the future. 

Hopefully, you found this article on basic security practices helpful as you
begin to develop your very own projects. Feel free to join our Discord
[https://discord.gg/ADWNDYVb8b] if you want to continue the conversation, share
projects, ideas, and join the community!

Start here with a free Infura account > [https://infura.io/register]

How to Use .env to Enhance Basic Security Within Your DApp

Optimistic Ethereum is a rollup scaling solution that allows users to submit
transactions on the Ethereum network and get them executed faster for a much
lower gas cost. From the perspectives of users and developers, this is a
"parallel universe" called Layer 2, or L2, where users typically have the same
addresses as they do on the Ethereum blockchain (also called Layer 1 or L1).
There are gateways that allow messages and assets to be transferred between the
universes.

The Optimism network API largely uses the same JSON-RPC specification as
Ethereum and Infura supports all the necessary API methods for building a fully
functional application on the Optimistic Ethereum network.

Why are transactions cheaper on Optimism?
On L1 Ethereum, thousands of nodes run your transaction to verify that the
proposed block that includes it is valid. This process is expensive and has to
be paid for. Unlike on L1 Ethereum, Optimistic roll ups provide faster and
cheaper transactions because it allows users to perform most of their tasks
off-chain in a "layer 2" protocol. On Optimistic Ethereum, the smart contract
has only two tasks: deposits/withdrawals and verifying proofs of transactions on
chain. This makes the process more efficient and a lot cheaper.

Why is this safe?
The great thing about decentralization is you can trust that transactions are
executed correctly because there are thousands of computers executing them.
Honest miners would reject such a transaction. With rollups, you don't have that
level of redundancy.

The answer, in the case of optimistic rollups, is incentives. Every node in the
network has to put up a stake before it can propose a new block with the
execution results of a transaction. Every other node can check up on those
results, and if it thinks they are incorrect, dispute them. The dispute is
resolved on L1, so it is as trustworthy as anything else in Ethereum. Whichever
node lies, either proposer or disputer, loses its stake and most of it goes to
the other node involved.

Of course, the whole point is to avoid running transactions in L1. This system
achieves that by making it pointless to cheat. Any proposer who attempts to
cheat is going to be caught by the other nodes, lose its stake, and not get the
invalid transaction result accepted as valid. A disputer can force a single
transaction to go into L1 arbitration as a denial of service attack, but the
stake is high enough that it wouldn't be worth doing.

How does Infura work with Optimism?
Infura exposes endpoints for Optimistic Ethereum (the production network) and
Optimistic Kovan (the test network). You use them the same way you use any other
network, by selecting them from the menu and using the specified endpoint.

There are a few small differences between building on Layer 1 Ethereum and
Optimism:

1. You must use the JSON-RPC API as we do not support Websockets yet.
2. Search filters are not yet supported

How to Get Started on Optimism...


The main difference between Optimism and regular L1 Ethereum (other than the
cost) is the access point URL. 

| Network          | RPC URL |

… If you are using the Truffle development environment
Infura users can add the free Truffle Optimism add-on directly on their Infura
dashboard. The Truffle Optimism box also contains the configuration definitions
[https://github.com/ethereum-optimism/optimism-tutorial/tree/main/truffle#truffle-configuration] 
required to use Infura. Currently, you will need to manually add the gas costs
of transactions when you use Truffle to run deployments or tests on Optimistic
Kovan or the main Optimistic Ethereum network.

… If you are using Hardhat
To use Optimistic Ethereum or Kovan, edit hardhat.config.js's 
modules.export.networks
[https://github.com/ethereum-optimism/optimism-tutorial/pull/60/files] to add
these definitions:

> "optimistic-kovan": {
url: 'https://optimism-kovan.infura.io/v3/<Infura Project ID>',
accounts: { mnemonic: <your account mnemonic goes here> },
gasPrice: 15000000,
ovm: true // This sets the network as using the ovm and ensure
// contract will be compiled against that.
},
"optimistic-ethereum": {
url: 'https://optimism-mainnet.infura.io/v3/<Infura Project ID>',
accounts: { mnemonic: <your account mnemonic goes here> },
gasPrice: 15000000,
ovm: true // This sets the network as using the ovm and ensure
// contract will be compiled against that.
}


Then you simply run:

> npx hardhat --network optimistic-<kovan or ethereum> <command>

… If you are using Remix
When you use the Remix Optimism plugin
[https://remix-optimism-compiler-plugin.readthedocs.io/en/latest?xgtab&] to
develop for Optimism, network connections are created through the wallet. If you
use MetaMask, you can select the network Custom RPC and fill in the details:

What is Optimistic Ethereum?

If you are an existing Infura IPFS user or are currently self-hosting your data
and want to migrate to the new Infura IPFS service
[http://infura.io/dashboard/ipfs], this tutorial is your step-by-step guide.

The new Infura IPFS service is more reliable, performant and comes with a bunch
of exciting features:

 * A project dashboard with all the essential stats (usage, storage size, etc.)
 * Pinning/Unpinning API
 * Regular background publishing of your files to the rest of the IPFS P2P
   network, so your content is accessible globally

Step 1 - Create your Infura IPFS Project
Register for a new account at https://infura.io (if you don't have one already),
and set up your IPFS project following the instructions.

After the registration, you will be redirected to the settings page, where you
find your credentials: PROJECT_ID + PROJECT_SECRET.

Step 2 - Install the ipfs-copy tool
Download the pre-compiled binary based on your operating system from the Github
Release v1.0.0 [https://github.com/INFURA/ipfs-copy/releases/tag/v1.0.0].

Alternatively, you can build it from scratch with Go tools.

Use go install:

go install github.com/INFURA/ipfs-copy/cmd/ipfs-copy@latest

Or clone the source code manually and compile it:

git clone https://github.com/INFURA/ipfs-copy.git
cd ipfs-copy
make install


Verify the installation:

ipfs-copy version
> ipfs-copy version: 1.0.0


For the next step, you have two options depending on whether you want to pin
existing Infura hosted data to your project or migrate data from a different
IPFS node.

Step 3 - Migrate data
How to pin IPFS data already hosted by Infura

If you want to pin only a handful of CIDs, you can manually use the standard
IPFS API with extra authentication for the Infura IPFS service.

Here is an API pinning call example using cURL:

curl -X POST -u "YOUR_PROJECT_ID:YOUR_PROJECT_SECRET" "https://ipfs.infura.org:5001/api/v0/pin/add?arg=YOUR_IPFS_CID"


If you have tens/hundreds or even thousands of CIDs, you can put them all in a
single file and run the ipfs-copy tool.

Create a file containing IPFS CIDs separated by a line-break character \n.

Example file:

QmaEZGiDrS7kDXMxbmpamrX1sPHZUM61a3YpjDoyaC3yfJ
QmTeRJXx623WwsoDk4371kh3JKCjoDcoWrqrhY9ekRasjE
QmUsQxC5bsgX53WhQ11DkxyB4uPYLEpdgmidFhGgUFK5aK


The ipfs-copy command will read your file with all the IPFS CIDs and pin them to
your Infura IPFS project in parallel with multiple workers for optimal
performance.

ipfs-copy --cids=/home/xxx/Documents/ipfs-cids.txt --project-id=<YOUR_PROJECT_ID> --project-secret=<YOUR_PROJECT_SECRET>


How to migrate data from another node
If you currently store your data on a self-hosted IPFS node, you can migrate
too! Focus on your business and let Infura handle all the IPFS infrastructure
and monitoring.

The ipfs-copy command will iterate all pins from the source node, copy the
blocks, and pin them to your Infura IPFS project.

ipfs-copy --source-api-url=http://localhost:5001 --project-id=<YOUR_PROJECT_ID> --project-secret=<YOUR_PROJECT_SECRET>


Done! You have completed the migration to the new IPFS service!

Open your Infura project's dashboard and review all the data, their size, or
usage.

Migrate Your Files to Infura's New IPFS Service In 3 Easy Steps

如果您是现有的 Infura IPFS 用户或目前正在自托管您的数据，并想迁移到新的 Infura IPFS 服务
[http://infura.io/dashboard/ipfs]上，本教程将会按步骤教您实现。

新的 Infura IPFS 服务更可靠，性能更强，并有一系列令人兴奋的新功能。

 * 一个包含所有重要统计信息 (使用量、存储大小等) 的 project 操作面板。
 * Pinning/Unpinning API
 * 定期在后台将您的文件发布到 IPFS P2P 网络中，保证您的内容可以在全球范围内被访问。

第1步 - 创建您的 Infura IPFS Project
访问 https://infura.io 注册一个新的帐户 (如果您还没有)，并按照说明创建您的 IPFS project。

注册后，您将被重定向到设置页面，在那里您可以找到您的凭证：PROJECT_ID + PROJECT_SECRET。

第二步 - 安装 ipfs-copy 工具
从 Github Release v1.0.0
[https://github.com/INFURA/ipfs-copy/releases/tag/v1.0.0] 下载您操作系统对应的预编译二进制文件。

或者, 您可以直接通过 go 来重新构建。

使用 go get：

go get -u github.com/INFURA/ipfs-copy


或者直接克隆源码来重新编译：

git clone <https://github.com/INFURA/ipfs-copy.git>
cd ipfs-copy
make install


验证是否安装成功：

ipfs-copy version
> ipfs-copy version: 1.0.0


对于下一步，您有两个选择，取决于您是想把现有的 Infura 托管数据 pin 到您的 project 上，还是从其他的 IPFS 节点迁移数据。

第三步 - 数据迁移
如何 pin 托管在 Infura 上的 IPFS 数据
如果您只想 pin 少量的 CID (content identifier)，您可以通过 Infura 做 IPFS 服务的额外登陆认证，手动调用标准的
IPFS API。

这里是一个使用 cURL 进行 API pinning call 的样例：

curl -X POST -u "YOUR_PROJECT_ID:YOUR_PROJECT_SECRET" "<https://ipfs.infura.org:5001/api/v0/pin/add?arg=YOUR_IPFS_CID>"


如何您有数十、数百甚至数千的 CID，您可以把这些 CID 放在一个单独的配置文件中，然后运行 ipfs-copy 工具。

创建一个包含 IPFS CID 的配置文件，每个 CID 通过换行符 \n 分隔。

样例配置文件：

QmaEZGiDrS7kDXMxbmpamrX1sPHZUM61a3YpjDoyaC3yfJ
QmTeRJXx623WwsoDk4371kh3JKCjoDcoWrqrhY9ekRasjE
QmUsQxC5bsgX53WhQ11DkxyB4uPYLEpdgmidFhGgUFK5aK


ipfs-copy 命令会读取您所有包含 CID 的配置文件，然后通过多个工作线程并行地将他们 pin 到您的 Infura IPFS project 中。

ipfs-copy --cids=/home/xxx/Documents/ipfs-cids.txt --project-id=<YOUR_PROJECT_ID> --project-secret=<YOUR_PROJECT_SECRET>


如何从另外一个节点中迁移数据
如果您当前的数据自托管在一个 IPFS 节点中，您依然可以进行迁移！Infura 会帮您搞定所有关于 IPFS 的基础设施和管理，您可以全神贯注地做好您的业务。

ipfs-copy 命令将会遍历源节点中的所有 pin，复制其内容块，同时将它们 pin 到您的 Infura IPFS project。

ipfs-copy --source-api-url=http://localhost:5001 --project-id=<YOUR_PROJECT_ID> --project-secret=<YOUR_PROJECT_SECRET>


恭喜您！您已经完成了向新的 IPFS 服务的迁移!

打开您的 Infura project 的操作面板，即可查看所有的数据，文件大小或它们的使用情况。

通过 3 个简单的步骤将您的文件迁移到 Infura 新的 IPFS 服务上

In part 1 of this series
[/an-introduction-to-ipfs/?utm_source=blog&utm_medium=Tutorial:%20IPFS2&utm_campaign=Tutorials]
, we took a tour of IPFS, explored its significance, and explained how it works.
Now, we'll show you how to get started with Infura’s latest IPFS service,
including a tutorial on how to use our IPFS API to pin and unpin your data
across the IPFS network, as well as upload and access files.

So, how do you pin your data across the IPFS network via the Infura API? It’s
much easier than you think! Once you have an Infura account (sign up for free
here
[https://infura.io/register?utm_source=blog&utm_medium=Tutorial:%20IPFS2&utm_campaign=Tutorials]
), you will be able to upload your files to IPFS and access that data.

Our new IPFS service is currently in Private Beta and the following guide
requires you to have access to the Beta. To sign up, click here
[http://infura.io/dashboard/ipfs]!

First, let’s get a file uploaded to IPFS.
There are many ways to upload a file to IPFS, including going directly through
IPFS locally installed on your machine or through the Infura API. For this
tutorial, let’s go through how to add, access, pin, and unpin your file using
Python and the Infura API. There are a couple ways to do this - in this
tutorial, we’ll go through the manual step-by-step, and will provide you with
some resources for using the API wrapper for when your IPFS needs get more
complicated.

The first thing you need to do is make sure Python is downloaded on your machine
(you can download it here [https://www.python.org/downloads/]), as our script is
written in Python. Next, you’ll want to ensure you import requests:

import requests


Next, we want to identify the file we are uploading, as well as its contents, to
be uploaded to IPFS. For our example, let’s do something simple and easy to
check to make sure it’s working correctly:

import requests
files = {
'file': '<full_path_to_your_file>'
}
response = requests.post('https://ipfs.infura.io:5001/api/v0/add', files=files, auth=(<project_id>,<project_secret>))
print(response.text)


When you run `python3 <filename.py>, you should get a printout of information
for the file you just added to IPFS, like the below:

You can see that we have been given the hash that was generated so we can easily
reference this file to see it later. Keep an eye on that one - we’re going to
use it later!

Lastly, note that in the parameters, we have one called `pin`, which is
defaulted to “true” - this means that when you upload your file, it does pin it
by default so you don’t have to worry about it. Pinned data will be persisted by
Infura until manually removed by the uploader whereas added files that are not
pinned will not have any access guarantees.

If you want to go the API wrapper route, you have a few choices, all with great
documentation that should help you get set up quickly. Again, these wrappers
allow you to complete more complex tasks more efficiently than using the above
code, once you’re at that point:

 * Go: https://github.com/ipfs/go-ipfs-api
 * JavaScript: https://github.com/ipfs/js-ipfs
 * Python: https://github.com/ipfs-shipyard/py-ipfs-http-client
 * This one has been made by the community, so it’s a little less mature/used
   than the Go and JavaScript options above

Now we'll show you how to actually access your file.
We’re going to try to access the file we just uploaded to IPFS, so to do that,
we will need to declare our parameters, which in this case is the hash we found
in the last step:

import requests
params = (
('arg','QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki'),
)


This allows us to put the hash in the proper location in our request we’re about
to call to download the file and its contents. The next bit of code is very
similar to what we did to add our file to IPFS, but note that we are using cat 
instead of add in our response:

import requests
params = (
('arg','QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki'),
)
response = requests.post('https://ipfs.infura.io:5001/api/v0/cat', params=params, auth=(<project_id>,<project_secret>))
print(response)


At this point, if we print out our response, we’ll see a 200 status code, which
tells us that we have successfully completed the request and can access the data
contained in the response we have:

<Response [200]>



If you want to read your file, you can simply `print(response.text)` instead of
just `print(response)` and you’ll be able to see the text!

Congrats! You added this file to IPFS!


You’ve now successfully uploaded and downloaded/read a file through the Infura
IPFS API - congrats!

What if I want to keep my current data I’ve uploaded to IPFS?
With this new update, content that was previously uploaded to the Infura IPFS
services via the unauthenticated API will need to be migrated to the new version
of the service. We will announce a deprecation period for any unauthenticated
pins very soon but don’t worry, you'll have ample time to move your data over.
Luckily, moving your data to the new IPFS version is very easy with our new
pinning option! Here’s a great blog post
[/migrate-your-files-to-infuras-new-ipfs-service-in-3-easy-steps/] on how to
migrate your data.

How do I pin an object to IPFS now? 
Pinning an object basically allows you to tell IPFS to always keep a given
object. Pinning your file will prevent the IPFS service from garbage collecting
your object, in other words, it’ll prevent your object from disappearing
automatically via garbage collection until you explicitly unpin it. We’ll go
through an example of each pinning command located in our documentation
[https://infura.io/docs/ipfs#tag/pin]:

To pin your file, you will want to use the `pin_add` command. Note: if you
upload your file with the above instructions, your file will be automatically
pinned and you do not need to do this step!

import requests
params = (
(‘arg’, ‘QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki’),
)
response = requests.post('https://ipfs.infura.io:5001/api/v0/pin/add', params=params, auth=(<project_id>,<project_secret>))
print(response.json())


When you run this, you should see the something like the following with your
pin’s information:

{'Pins': ['QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki']}


I don't need my object anymore - can I unpin it? 
As we mentioned, your object will stay pinned until you unpin it. To unpin an
object, you’ll need to remove it from local storage by running `pin_rm`.

import requests
params = (
('arg','QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki')
)
response = requests.post('https://ipfs.dev.infura.org:5001/api/v0/pin/rm',params=params, auth=(<project_id>,<project_secret>)
print(response.json())


Again, if you just want confirmation that your unpin worked, you can run
`print(response)`, or if you want to see the printout, simply run the above
command and you’ll get the below (which looks exactly like the printout from
pinning your file):

{'Pins': ['QmeY7x2rEzyUxh2uwhXMqgBnPvcxzgNcQcUQWJG94Hv9ki']}


And that’s it! You now know how to add, pin, and unpin files to IPFS using
Infura. Have fun! Check out our documentation [https://infura.io/docs/ipfs] for
a full list of our current supported functionality and the associated urls you
can use to implement the call of your choice:

What’s next?
Subscribe to our newsletter
[https://infura.us14.list-manage.com/subscribe?u=7bec10aa5be97e80fcb0e7c52&id=13433031de] 
so you can be the first to know when new products launch. As always, if you have
questions or feature requests, you can join our community
[https://community.infura.io?utm_source=blog&utm_medium=Tutorial:%20IPFS2&utm_campaign=Tutorials] 
or reach out to us directly
[https://infura.io/contact?utm_source=blog&utm_medium=Tutorial:%20IPFS2&utm_campaign=Tutorials]
.

Part 2: Getting Started with Infura’s IPFS Service - UPDATED June 2021

The Meteoric Rise of NFTs
If you’ve been following the crypto space lately, you’ve probably seen that
Non-Fungible Tokens (NFTs) have been the talk of almost every artist and
creator. From the sale of Beeple’s “Everydays: The First 5000 Days” for $69.3M
[https://www.washingtonpost.com/entertainment/museums/beeple-digital-artwork-sale-perspective/2021/03/15/6afc1540-8369-11eb-81db-b02f0398f49a_story.html] 
to NBA Top Shot surpassing $205 million in total sales within six months
[https://hypebeast.com/2021/2/nba-top-shot-over-200-million-usd-sales-announcement] 
to EulerBeats [https://eulerbeats.com/] generating more than $1.1. Million in
royalties
[https://decrypt.co/59600/eulerbeats-generate-1-1-million-in-royalties-in-first-week] 
during its first week, interest in NFTs is at an all time high. Across the
board, we have seen NFTs enable the financialization of digital goods: art,
music, content, virtual land, gaming collectibles, and essentially anything that
benefits from verified authenticity and provable ownership rights. 

While artists have been continuously setting records with their sales, the NFT
marketplaces and galleries have also been exceeding expectations. Currently, the
gallery model, which curates an exclusive selection of art for buyers like a
traditional art gallery, has been generating less volume compared to
marketplaces, which are akin to an art bazaar where anyone can display their
works for sale. For example, the curated nature of Nifty Gateway and SuperRare
limits the number of artists who are allowed on the platforms, creating an
allure of brand recognition and exclusivity compared to platforms like OpenSea
and Rarible which allow anyone to post their NFT. That being said, both models 
have experienced immense growth in this NFT boom
[https://consensys.net/blog/codefi/how-nft-art-marketplaces-are-merging-with-defi/?utm_content=155192697&utm_medium=social&utm_source=twitter&hss_channel=tw-3129477561]
.

Monthly protocol users for Rarible [http://rarible.com/], a leading NFT
marketplace, hit an all time high for March, surpassing 58,000
[https://explore.duneanalytics.com/dashboard/rarible].

Data Source: Dune Analytics [https://duneanalytics.com/alexfal/rarible]

Superare [https://superrare.co/], the top NFT gallery, surpassed $15 million in
volume for the month of March
[https://explore.duneanalytics.com/dashboard/superrare_4].

Data Source: Dune Analytics [https://duneanalytics.com/rchen8/superrare_4]

Artists sold 2,000 works
[https://explore.duneanalytics.com/dashboard/superrare_4] on SuperRare in March,
marking an all-time high for the gallery.

Data Source: Dune Analytics [https://duneanalytics.com/rchen8/superrare_4]

Currently, NFT aggregators, issuance protocols, and generalized marketplaces are
driving the growth of the NFT space and are the more obvious market
opportunities. Below are a handful of the leading art platforms and marketplaces
today:

Source: Messari
[https://messari.io/article/nft-marketplaces-valuing-the-ebay-and-shutterstock-s-of-nfts?utm_source=MasonNystrom&utm_medium=lede-tweet&utm_campaign=NFTmarketplaces] 
 

It’s undeniable that the market is assigning real value to provable digital
ownership and this new open creative economy is here to stay. Over time, we
expect to see value continue to flow into these marketplaces and competition to
heat up as new novel platforms are introduced. We also expect that the success
of these platforms will ultimately come down to their ability to attract users
and creators by devising markets for participants to easily mint, collect,
showcase, and trade art and collectibles. The question now becomes: given the
current NFT landscape, where are the opportunities and how can we build
marketplaces to address the needs of this growing niche?

While there are many NFT marketplaces we could explore, we thought we would take
the time to introduce a new project called Barter, recently built by a ConsenSys
Academy student. We’ll show you how the project implemented an on-chain order
book for NFT trading, and how they plugged in Infura and Truffle to get it off
the ground quickly. After you review this project, you can better understand how
these marketplaces can be created, and the additional opportunities that exist
for them.

How I Built This: Barter
Barter is a project built by Robert Clark [https://twitter.com/CryptoDiplo], a
student from ConsenSys Academy [https://consensys.net/academy/] that is
specifically engineered for a future where video game assets are tradeable and
where the Metaverse (as coined by Neal Stephenson
[https://en.wikipedia.org/wiki/Neal_Stephenson]) begins to emerge as a social
phenomenon. People already buy, collect, and curate assets inside video games
(characters, armor, weapons, etc) so the ability to trade them directly with
other players would be explosive. With Barter, a direct trading interface
between two people allows for real-time negotiation as well as new item
discovery. This creates a more natural trading experience that is already the
norm across games like Rocket League and Runescape. 

In this section, we walk you through how this developer built Barter from the
ground up, using Infura and Truffle.

Project Structure
Barter's user interface is quite simple, consisting of a one-page react app that
can toggle between the “trade proposal” page and the “offers” page. Once a user
has connected their Metamask [http://metamask.io/] account and added the
recipient’s address, they click ‘Propose Trade’ and create a trade offer. A
transaction prompt appears and allows them to send the offer on-chain. For the
user on the other side of the trade, an offer will pop-up for them in the offers
box, accessible via the button in the top right corner. This offer will give
them a brief overview of the NFT and its price, along with an accept and reject
button. If the user clicks accept and sends the prompted transaction, the trade
will execute.

On the Solidity side, Barter was set up as an on-chain order book for NFT
trading. In order to successfully complete an NFT trade between two users, one
user first must create an offer and post it to the contract. Offers are address
specific, so the user making the offer must know who they want to trade with
ahead of time in order to successfully complete the trade. Once the offeror is
done configuring their trade in the UI, they can proceed to posting a TradeOffer
, an instance of which is shown below:

struct TradeOffer {
        address payable offerer;
        address payable asker;
        uint[] offer;
        uint[] ask;
        address[] offerContract;
        address[] askContract;
        uint offerLength;
        uint askLength;
        uint offerVal;
        uint askVal;
        uint feePaid;
        State state;
    }


This offer is made up of 4 main pieces of information;

1) the trader addresses,

2) arrays of offered and asked NFT IDs,

3) arrays of offered and asked NFT Contract addresses, and

4) an optional amount of ETH val that can be added to either side of the offer. 

The contract tracks an array of every offer posted, and has many safeguards put
in place to make sure there are no ways for NFTs or ETH to be sent around
without proper completion of an offer. For example, the addOffer function as
shown below is made up almost entirely of different require statements. In order
to make an offer, the contract first must verify that the offeror actually owns
the NFT, has submitted the right amount of ETH as a fee, and has tried to trade
at least one NFT, among other verifications.

function addOffer(uint[] memory _offer, address[] memory _offerContract
                    , uint[] memory _ask, address[] memory _askContract
                    , uint _offerVal, uint _askVal, address payable _targetAddress) 
                    public payable stopInEmergency() returns (bool) {
 
        require(_offer.length >= 1 || _ask.length >= 1);
        require(_offer.length == _offerContract.length);
        require(_ask.length == _askContract.length);
        require((_offerVal+fee) == msg.value);
        for(uint i = 0; i < _offer.length; i++) {
            ERC721 con = ERC721(_offerContract[i]);
            require(approvedERC721[_offerContract[i]]);
            require(con.ownerOf(_offer[i]) == msg.sender);
            require(con.isApprovedForAll(msg.sender, address(this)));
        }
 
        for(uint i = 0; i < _ask.length; i++) {
            require(approvedERC721[_askContract[i]]);
        }
 
        emit LogOfferAdded(offerCount, msg.sender);
        offersByAddress[_targetAddress].push(offerCount);
        offerCountByAddress[_targetAddress] = offerCountByAddress[_targetAddress]+1;
        offersCreatedByAddress[msg.sender].push(offerCount);
        offersCreatedCountByAddress[msg.sender] = offersCreatedCountByAddress[msg.sender]+1;
                offers[offerCount] = TradeOffer({offerer: msg.sender
            , asker: _targetAddress
            , offer: _offer
            , offerContract:_offerContract
            , ask: _ask
            , askContract:_askContract
            , offerLength:_offer.length
            , askLength:_ask.length
            , offerVal: _offerVal
            , askVal:_askVal
            , feePaid:fee
            , state: State.Active});
        offerCount = offerCount + 1;
        
        return true;
    }


There is a similar set of checks for accepting a trade, as the original offeror
may have ditched all the NFTs they originally had after the offeree took too
long to accept. This is slightly redundant from a security standpoint but it
protects against offers being created when they have no hope of being accepted.

Plugging in Infura and Truffle
Using Truffle [https://www.trufflesuite.com/] along with Infura
[https://infura.io/?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter] 
made the connection to a testnet (Ropsten) straightforward and easy. There was a
declaration of the mnemonic from the HDWalletProvider along with our Infura
ProjectID. Then we simply acquired some Ropsten ETH from one of the faucets
available and used the boilerplate Truffle code to migrate to Ropsten
[https://consensys.net/developers/onboarding-step-3/]. Once it was successfully
deployed, we got the contract IDs and replaced the contract variables in our
React code to point to the correct contracts. 

ropsten: {
   provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/${infuraKey}`),
   network_id: 3,       // Ropsten's id
   gas: 5500000,        // Ropsten has a lower block limit than mainnet
   confirmations: 2,    // # of confs to wait between deployments. (default: 0)
   timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
   skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
   }//,


Future State
The on-chain order book design choice of this project has certain limitations.
Every offer must be a transaction, which can get expensive when Ethereum is
nearing full utilization. But if this project is deployed on a high throughput
layer two (L2) solution, potentially one with video game assets with low enough
value to merit trading en masse, this interface could be a very useful tool. 

Changes to the user interface, from a matching engine perspective, could open up
other possible extensions for this project. Unlike the OpenSea
[http://opensea.io/] bulletin board approach, the trading interface approach
could be extended to allow users to set preferences for acquiring different
types of items, and a multi-party trade matching engine could sort through
different ways to help them acquire that item. Say party 3 has an item you want,
and you have what party 2 wants, but not what party 3 wants. The interface could
set up a 3 way trade to satisfy all parties involved.

One final nuance that is interesting to consider is that usually when interfaces
are built like this, they are for one specific game. Because of the
interoperability of ERC-721 this can be extended to trade any two things of
value. You could trade a digital painting for Metaverse outfit, or even swap
deeds to your homes with a friend. 

Conclusion
Overall, we’re fascinated by the increase in interest and evolution of NFTs and
expect to see even more activity in the coming year. We’re proud that developers
are leveraging Infura to build decentralized apps that allow creators to share
art and interact directly with an enthusiastic community of collectors. 

Building an NFT project? Infura is a critical part of your toolkit. Sign up for
free
[https://infura.io/register?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter] 
and unlock robust, scalable tools for Ethereum and IPFS development.


--------------------------------------------------------------------------------

Twitter [https://twitter.com/infura_io] | Newsletter
[https://infura.us14.list-manage.com/subscribe?u=7bec10aa5be97e80fcb0e7c52&id=13433031de] 
| Community
[https://community.infura.io/?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter] 
| Docs
[https://infura.io/docs?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter] 
| Contact
[https://infura.io/contact?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter] 
| Open Roles
[https://consensys.net/open-roles/?discipline=32536?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=flashbot2]

Huge thanks to Robert Kruszynski [https://twitter.com/Ro_bbieK] and Mattison
Asher for their contributions to this guide. For more Web3 tutorials, check out
the Infura Blog
[/?&utm_source=infurablog&utm_medium=referral&utm_campaign=Tutorials&utm_content=barter]
and ConsenSys Academy [http://learn.consensys.net/].

Tutorials

Infura product tips and Web3 tutorials for developers building decentralized applications.

How to Use .env to Enhance Basic Security Within Your DApp

Migrate Your Files to Infura's New IPFS Service In 3 Easy Steps

通过 3 个简单的步骤将您的文件迁移到 Infura 新的 IPFS 服务上

Part 2: Getting Started with Infura’s IPFS Service - UPDATED June 2021

How Barter Built a Direct NFT Trading Interface for Real-time Negotiation