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19 Dec



CIRCOM IN REMIX PART 2: PLAYTIME

Author: Rob Stupay

The Remix Circom plugin is a great tool for getting started with writing ZK
circuits in Circom. The Remix innovation here is that we’ve got the Circom
compiler working in the browser. This makes playing with Circom easier because…
well, because it’s Remix, so no setup is needed. Just keep in mind that the
plugin is in alpha, so it’s not for production use yet.

Under the hood, the Remix Circom plugin’s GUI (graphical user interface)
organizes your data into the correct parameters for the methods in snarks.js, so
you don’t need to dig too deep there unless you want to. And if you want to, we
also have scripts you can adapt that use snarks.js and ethers.js.

LINK TO PART 1

Part 1 Circom in Remix article (the definitions)


COMPONENTS OF THE PROOF

At a high level, to make a proof with a ZK system, you need:

 1. The inputs — both private and public
 2. The circuit
 3. The witness
 4. The constraint system
 5. The signals ( the inputs, outputs, and intermediary steps of the circuit)
 6. A special set of random numbers (from the trusted setup- the Perpetual
    Powers of Tau ceremony)

If these components don’t make sense, please see Part 1 of this series.

The proof can be generated and verified, and it can be submitted for on-chain
verification via a Solidity file which we will be generating later in
this article.

Let’s take a walk through the Circom compiler plugin.


REMIX’S SIMPLEST ZK SNARK EXAMPLE

Let’s choose a very basic example to start with. Remix has added some Workspace
Templates for Circom. When you choose one of these templates, the Circom
compiler will automatically activate.

To see these templates, create a new Workspace by clicking on the hamburger menu
in the File Explorer and choosing the Create option. Then, in the modal that
comes up, click the Choose a template pulldown menu, and the following list will
come up:

The most basic Circom example file is the simple.circom file which is located in
the Semphore template. So to start, choose this template.

Here’s the compiler:

In order to use the plugin you will need to have a .circom file active in the
File Explorer, so choose simple.circom.

Then go to the Circom compiler and the compile button can be used.

> Note: If the active file in the Editor is not a Circom file, the compile
> button in the plugin cannot be clicked.

You can either hit the Compile button or use the Ctrl+S keyboard shortcut as
shown above in the tool-tip. The compilation result will be stored in a .wasm
file in the .bin directory that is inside the circuits folder.

Next, create the R1CS constraint file by clicking the button.

Generate R1CS button with tooltip

This creates the simple.r1cs file in the .bin directory. Generating the R1CS
file can take longer than compiling the .circom file.

COMPUTE WITNESS

The prover inputs their private info for the circuit in this section.

Now dial down the Compute Witness caret.

I’ve input the following:

So my private info is 3 & 4.

When I hit the compute button, a .wtn file is created in the .bin folder.


FILES GENERATED SO FAR

We now have:

 * simple.wasm (the compilation result)
 * simple.r1cs (the constraint file)
 * simple.wtn (the witness file)

Notice there is no proof file, nor have we generated a Solidity file for doing
an on-chain verification of the proof.

Currently in the Remix Circom plugin, these steps can only be done by
running scripts.


USING THE SCRIPTS IN THE CIRCOM COMPILER

Let’s switch to a different Workspace Template to go through the run_setup and
run_verification scripts.

Hash Checker template has fewer parameters in its scripts than the Semphore
template does.

So load this template up.

BEFORE RUNNING A SCRIPT

Scripts need a compiled circom file to work with. So before running a script in
this plugin, compile calculate_hash.circom (by making it the active file in the
Editor and then in the Circom plugin’s GUI, by clicking the compile button).

This will generate the file calculate_hash.wasm in the ./circuits/.bin folder.


RUNNING SCRIPT RUN_SETUP.TS

MAKES THE R1CS FILE

First, the run_setup.ts script creates the .r1cs file in the circuits/.bin
directory, just like the Generate R1CS button did.

The setup script will then take the special randomness of the Powers of Tau
ceremony, and will contribute to it and add its phase2 as described in the
snarks.js docs and in the Circom docs.

> The trusted setup consists of two parts:

> • The powers of tau, which is independent of the circuit
> • The phase 2, which depends on the circuit

> - from Circom Docs

MAKES THE VERIFICATION KEYS

The verification keys will be used for verifying the proof.
The script generates and stores them in this file:
zk/build/verification_key.json

MAKES THE FILE FOR ONCHAIN VERIFICATION

The run_setup.ts script will also generate the Solidity file for verifying the
proof. It will also be saved in this directory.

ZK_SETUP.TXT

Finally the zk_setup.txt will be generated and saved in this directory, which
will be used for getting the zkey_final parameter when running
run_verification.ts.

Here’s what the build folder will contain after running run_setup.ts:


RUNNING RUN_VERIFICATION.TS

This script makes the proof and then will run the verification.

The inputs for the proof include:

 1. The private information: these are hard coded on lines 31–34
 2. The other preliminary files that were created in run_setup.ts, including:
    calculate_hash.r1cs, calculate_hash.wasm, zk_setup.txt,
    verification_key.json

It will create the proof as well as the public signals with this line:

    const { proof, publicSignals } = await snarkjs.groth16.prove(zkey_final, wtns);

And then, it will take the proof, the public Signals, and will verify them with
this line:

 const verified = await snarkjs.groth16.verify(vKey, publicSignals, proof, logger);

From here, see if you can use the zk_verifier.sol file. Also, try inputting a
wrong value into the proof (see line 36) to see what will happen.


COMMENTS WELCOME AND NEEDED

The Remix Circom plugin is in Alpha, so please send your comments.

One of our next updates to the plugin will a button for generating a proof. More
Remix Circom Workspace templates are also coming.

Join our Discord server and comment there, or send us an email to
remix@ethereum.org! We will have articles about each of the Circom Remix
Workspaces: Semaphore, Hash Checker, and the Rate Limiting Nullifier later in
this series.

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

Circom in Remix Part 2: Playtime was originally published in Remix Project on
Medium, where people are continuing the conversation by highlighting and
responding to this story.

More...
19 Dec



CIRCOM IN REMIX PART 1: DEFINITIONS

Author: Rob Stupay

Remix now has a Circom Compiler for running circuits and generating ZK Proofs.
This is Part 1 of a 2-part series about Circom in Remix. This article goes
through ZKProof vocabulary and concepts so you can understand the interface of
the Remix Circom compiler. But, if you want to jump ahead, here’s the link to
Part 2.

In order to work with Circom, you should go through their docs and their ZK
Background page. Many of the definitions contained in this article are from this
excellent video, Arithmetic Circuits in Circom v2.0 by Darth Cy.


BASIC ELEMENTS OF A ZK-SNARK

A ZKProof, contains these elements:

 * Public inputs that are known to everyone
 * Private inputs that are only known to the prover, who claims that these are
   the right inputs for solving the problem.
 * Problem: a function that takes private and public inputs. It is also the
   circuit, which we will get into below.
 * Prover: a person who knows the solution (the private inputs) for the problem.
   The prover runs the program that executes the circuit and generates a proof.
 * Verifier: a program or a person that takes a proof (with the public inputs),
   and can verify its validity without needing the private inputs.


ZK PROOF IS IN A MATHEMATICAL CONTEXT

The prover wants to prove to the verifier that they have a piece of information
—while hiding this information. In the context of Circom (and most ZK Proofs),
the information is a number or an encoding — like a hash of some text. And in
this mathematical context, the private input will need to satisfy a
criteria — like an equation.


THE MECHANISM OF A ZK PROOF

In a proof, there is the original, private input which is encoded and used in a
polynomial equation let’s call it f(x). Then a prover comes along and says they
have the same private input which is also encoded and used in another polynomial
equation g(x) , let’s call this the expected polynomial equation.

The verification system is a way of comparing the two equations by feeding them
arbitrary data and checking that the results are the same. The arbitrary data
must indeed be random, otherwise the proof of the private input could be faked.

Now let’s get into a technical glossary of the basics.


CIRCOM

Circom is a low-level language that describes mathematical procedures by
simplifying complex mathematical operations into circuits.


CIRCUITS

In the context of Circom, a circuit is a mathematical equation — a polynomial
equation. It is written with a series of logic gates. The logic gates of Circom
can either be where two numbers are multiplied, or where an arbitrary set of
numbers are added.

So this equation:

is rewritten as steps, where x is multiplied by x, and then the result of that
is multiplied by y, and that result is added to 6.

This is also referred to as “flattening” the equation.

Then, each step of the equation is a multiplication or summation logic gate.

By breaking down a complex equation into smaller steps, there will be
intermediary outputs. These intermediary outputs in the formula above are m1
and m2.


SIGNALS

Signals can be the original inputs, the intermediate outputs, or the
final output.


TEMPLATES

Templates are the building blocks of the Circom language. They take signals as
their inputs, and their outputs are also signals. In other languages, templates
are known as classes. But take note that in Remix, templates, used in the
context of Workspaces, are the files that load with a new Workspace.


WITNESS

The witness is generated from the signals which includes all inputs, outputs and
intermediary signals.

The intermediary signals are an ingredient in the witness to show that the
circuit went through an honest execution.

To generate the proof, only the witness is needed.


CONSTRAINTS

These are the individual steps in the computation of an equation.


R1CS — RANK 1 CONSTRAINT SYSTEM

R1CS is a protocol for organizing the constraints. For more, see this article.
Basically, R1CS flattens the equation and organizes the arrangement.


GROTH16

Groth16 is a proving system.

As described above, verification is done by sending a set of arbitrary data to
the circuit and checking that it returns the same results as the circuit derived
from the original private input.

RANDOMNESS

It is essential that the arbitrary data fed into the circuits are truly random,
otherwise a proof could be forged.

The process of getting the random points is the Trusted Setup.

Also see Darth Cy’s video about Groth16, as well as Vitalik Buterin’s
2016 article.


TRUSTED SETUP

The trusted setup is the process of creating a dataset of random numbers. It
involves any number of parties contributing randomness (also called “entropy”)
to a dataset.

The trusted setup is called a ceremony, and the specific one for Groth16 is the
Powers of Tau ceremony.

Once the randomness from the ceremony is encapsulated into a randomness file, it
is prepared for phase2.


PHASE2

Groth16 needs two types of random number sets:

 * a set from a trusted setup and that have nothing to do with a
   specific circuit
 * Phase2 number sets which are specific to a circuit

The preparation the Phase2 dataset is a process that first involves the creation
of a final ceremony file. Then the circuit you are working with is “intertwine”
and a ZKEY file is produced. The ZKEY file is required every time you want to
generate a proof for a particular circuit.

Typically, additional randomness is added to the ZKEY file.

Like French cooks who always add butter, ZKP chefs are always adding randomness
to their recipes.

Read more about Phase2 in the snarksjs docs.


GENERATING A PROOF

To generate the proof you need:

 1. Circuit-specific witness calculator — a program, which calculates witness
    from input signals (private and public)
 2. ZKey file which is a representation of the circuit
 3. input.json — a file with public and private signals.


THE BASIC BACKGROUND IS DONE!

…there’s more to study, but that’s will get you familiar with most of the terms
in the Circom compiler

So it’s time to find the proof in the pudding. And by the way, the proof in this
pudding is not in the eating, it is in evaluating the polynomials. So get your
hands out of the dessert and into some honestly random data and circuits.

Learn about how to use Remix’s Circom compiler in Part 2 , which you will
find here.

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

Circom in Remix Part 1: Definitions was originally published in Remix Project on
Medium, where people are continuing the conversation by highlighting and
responding to this story.

More...
04 Dec



REMIX RELEASE V0.38.0

Author: Aniket


THE BIG NEWS

 * New Circom ZKP workspace templates: Hash Checker & Rate Limiting Nullifier
 * Define Solidity remappings in remappings.txt file
 * Alpha release for Solidity co-pilot
 * Run free function for any selection environment


HASH CHECKER & RATE LIMITING NULLIFIER TEMPLATES FOR CIRCOM

Building on our previous release that included a Semaphore template, we added
more templates for Circom.

To get to these templates, go to the hamburger menu in the File Explorer and
make a new workspace and in the modal that comes up choose

Now I realize Rate-Limiting Nullifier sounds like school yard epithet.

> “You’re so boring!”

> “Well you‘re a Rate-Limiting Nullifier”

But Rate Limiting Nullifiers are used for limiting the number of “something”
that a user can do — for example the number of allowable post to a form and once
that number is exceeded then the offending person’s identity is revealed. It’s
used in Zero Knowledge Proofs and it gets at the algebraic nature of Circom.
Check out these new templates!


SOLIDITY REMAPPINGS IN REMIX

Create a file called remappings.txt in the root of your workspace and place your
Solidity Remappings there. This will be especially familiar to you
Foundry users.


SOLIDITY COPILOT PLUGIN (ALPHA RELEASE)

Check out our first forays into a version of Copilot for Solidity so you can get
code suggestions in the editor.

Then start coding away and see the suggestions.

Adjust the Copilot settings in the Settings panel:

THIS PLUGIN IN ALPHA

Please join our discord and send us your comments about this plugin.


THANK YOU KNOWLEDGEABLE REMIX USERS

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

We no longer follow the discussions on Gitter, so we encourage you to move over
to our Discord server for community support. Or, send us an email at
remix@ethereum.org!

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

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08 Nov



REMIX RELEASE V0.37.0

Author: Rob Stupay


THE BIG NEWS

 * Circom plugin and ZKP Circom Semaphore template
 * ERC auto-complete will load the file
 * The Remix UI now translated into Spanish, French, Italian, and Simplified
   Chinese
 * Load Recent Workspaces
 * Start Coding Button
 * Updates for compatibility with OpenZeppelin v5.0 contracts


CIRCOM PLUGIN AND ZKP CIRCOM SEMAPHORE TEMPLATE

We’ve added a Semaphore Circom template which you can load by creating a new
Workspace.

When the template loads, our new Circom compiler plugin will load.

Start playing with ZK Proofs in Remix!


ERC AUTO-COMPLETE AND FILE LOADING

Remix now auto-completes all the ERC files when typing “erc”. The selected ERC
file will load in the Editor. Try this out in an empty file:

And when you select one, the ERC file will be printed out, like this:


THE REMIX IS NOW TRANSLATED INTO SPANISH, FRENCH, ITALIAN, AND SIMPLIFIED
CHINESE

The language can be chosen in three places:

 * At the top right of the Home Tab:

 * At the bottom of the Settings Panel
 * Via a URL by using the lang parameter with the language abbreviation:

Big shout-out to our Spanish (Juan David), French (Mehdi Amari), Italian
(matlemad). And another huge shout-out to @drafish who contributed the original
i18n PRs as well as doing the Chinese translations along with Mocca. (Actually
the Chinese translations have been around for a few months now).

In case you didn’t know, the Remix docs are available in Chinese, Spanish,
French, and Italian.

To contribute to the translation of documentation, go to CrowdIn — Remix
Translation our translation management platform.

To contribute to the translation of the Remix UI go to CrowdIn-Remix UI.


HOME TAB: RECENT WORKSPACES

Your recent workspaces are now listed:


HOME TAB: START CODING

The Start Coding button will open up a new Workspace called Playground and will
load a HelloWorld file in the Editor.


SUPPORTING OPENZEPPELIN V5

We’ve updated our OpenZeppelin templates and have made the necessary updates to
support the latest release of OpenZeppelin.


THANK YOU WONDEROUS REMIX USERS

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We no longer follow the discussions on Gitter, so we encourage you to move over
to our Discord server for community support. Or, send us an email at
remix@ethereum.org!

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

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27 Sep



REMIX RELEASE V0.36.0

Author: Rob Stupay


THE BIG NEWS

 * AI comes to Remix in the Editor and in the Solidity Compiler
 * More “Quick Fixes”
 * Ephemery and SKALE Chaos Testnet added to Deploy & Run


CHATGPT

AI IN THE EDITOR: EXPLAIN A FUNCTION AND GENERATE DOCUMENTATION

You can now ask ChatGPT to explain a function or to generate documentation for a
function — right in the editor.

But to get this to work, in the Settings panel, make sure that the box is
checked to “Enable code completion in Editor.”

Then, with a Solidity file open in the Editor, you can “right-click” in the body
of a function, which will reveal a pop-up menu. Click on the option “Explain the
function” or “Generate documentation.”

The explanation or documentation will print out in the terminal.

AI IN THE SOLIDITY COMPILER: HELP WITH SOLIDITY ERRORS

In the Solidity Compiler’s error “cards”, we’ve added a prompt: “Ask GPT” which,
when clicked, will display an explanation of the error in the terminal.


NEW “QUICK FIXES” IN THE EDITOR

In the previous release we added Quick Fixes to the Editor. In this release, we
have added more Quick Fixes to:

 * Add a specific pragma
 * Add required visibility for Fallback and Receive methods
 * Add data location (e.g. storage, memory, calldata) to constructor params,
   function params and variables
 * Add virtual or override to a function
 * Mark a contract abstract

To make a “Quick Fix”, click on the big blue dot in the Editor.

Then select the suggested correction.

The “Quick Fix” will be input into the function.


NEW ENVIRONMENTS IN DEPLOY & RUN TRANSACTIONS

We’ve added two new options in the Environments select box of the Deploy & Run
Transactions plugin. These options save you the trouble of configuring you
browser wallet with the configuration info for these chains.

EPHEMERY

Ephemery is a testnet that resets after seven days. As a result, its faucets run
without clogs. It’s a great chain for heavy testing.

For more info check https://ephemery.dev or check the Ephemery Repo.

SKALE CHAOS TESTNET

The Chaos testnet is a project of Skale. Get tokens for this chain here or here.


MORE ADDITIONS

 * In the Verification — Etherscan plugin, LineaScan is now supported, so
   contracts can now be verified there too.
 * Custom error details are now shown with Injected Web3 environment. Previously
   it was for VM only.


THANK YOU WONDEROUS REMIX USERS

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We no longer follow the discussions on Gitter, so we encourage you to move over
to our Discord server for community support. Or, send us an email at
remix@ethereum.org!

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

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18 Aug



REMIX RELEASE V0.35.0

Author: Rob Stupay


THE BIG NEWS

 * “Quick Fixes” in the Remix Editor!
 * Take the Remix User Survey


REMIX USER SURVEY

Remix has a quick, one-minute survey to help us better understand you, dear
user, and your development needs. You can find the link on the home tab in the
Featured section. Or, just click here.


QUICK FIXES IN THE REMIX EDITOR

Now in Remix, fixing the license, the visibility, or the mutability is as easy
as a swatting flies in a cow pasture.

LICENSE FIXES

Have you ever forgotten to add the license to a file, and then got the warning,
and then forgot the syntax of the license?

In the image below, I left out the license and I get the warning and this blue
dot. If you can’t get the Quick Fix blue dot to appear, try clicking on the
number for the line where the error occurs.

When you click on the blue dot there are a few options:

And selecting the open-source license will add this update to the file:

VISIBILITY QUICK FIXES

When a file has a visibility error because the visibility is not specified, the
blue dot will appear to the left of the function.

Click on the dot, and a popup menu will appear.

MUTABILITY QUICK FIXES: VIEW

With the quick fix from the image above the file will look like this:

But the mutability has not been specified, so again the blue dot will appear.

Clicking the dot will show this popup menu:

MUTABILITY QUICK FIXES: PURE

When the pure keyword is needed for a pure function, the Quick Fix will
suggest it.

Clicking the blue dot will yield the suggestion:

And adding the suggestion will add the pure keyword.


THANK YOU WONDEROUS REMIX USERS

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We have migrated our community channels off Gitter and on to Discord. Although
we still follow the discussions on Gitter (now through Matrix), we encourage you
to move over to our Discord server. Or, send us an email at remix@ethereum.org!

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

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29 Jun



REMIX RELEASE V0.34.0

Author: Rob Stupay

We have entered the time of year where you can listen to your neighbors singing
in the shower as the tomatoes ripen in the garden. In this juicy Remix release,
we are singing about Linting, Verifying, and Analyzing…


0.34.0’S BIG NEWS

 * Updates for the Etherscan Verification plugin including proxy contracts!
 * Linting is added to the Static Analysis plugin
 * The File Explorer’s Workspace hamburger menu has moved to the left. Go there
   to navigate all things Workspace!
 * New scripts for verification and deployment in the hamburger menu
 * New labels in Deploy & Run showing the EVM version
 * Remix’s WalletConnect plugin is all set for WalletConnect v2.0


STATIC ANALYSIS

The Solidity Static Analysis plugin has been renamed to Solidity Analyzers. The
plugin is now packaged with the SolHint linter. The plugin also run Slither
Static analysis (if you are connecting to your filesystem with Remixd) and of
course Remix Static Analysis.

To use the plugin, a file should be already compiled.

As you can see above, Slither is disabled and will only work when you are
connecting Remix to your local filesystem with Remixd.


HAMBURGER HAMBURGER

The Workspace hamburger menu is now in the top left corner of the Workspaces
area of the File Explorer.

And, inside the hamburger we’ve added a few new options:

Add Etherscan scripts will add a folder inside the scripts folder containing
two .ts files—one for verifying, and one for getting the GUID of a verified
contract. The script for verifying has inputs for chain id and it will work for
verifying a proxy contract.

The Add contract deployer scripts also adds a couple of scripts. One script is
for automating deployment, and the other is a factory for deploying a contract
to different chains, but the contract’s address will be the same.

Go forth and run scripts!


KNOW YOUR CONTRACT’S EVM VERSION

Not all EVM versions work on all chains. We’ve added a badge in Deploy & Run
indicating which version of the EVM the contract was compiled with.


ETHERSCAN PLUGIN

For all you contract verifiers out there (which should be 100 percent of you)
we’ve made some important updates to the Etherscan plugin.

Of course, contract verification with Etherscan is not the only way to verify a
contract. You can also use the Sourcify service (when deploying, check the box
to publish to IPFS and the Sourcify service will be able to verify your
contracts) or use the Remix Sourcify plugin. But I digress…

The Etherscan plugin has been renamed and is now called:
Contract Verification — Etherscan.

You can access it from the Plugin Manager.

As of this release, in addition to Ethereum Mainnet and testnets, this plugin
now supports verification on other chains through the Etherscan family of block
explorers. But you will need to choose one of the chains where the block
explorer has an API key, and then you will need to input your API key.

For example, if you are trying to verify on an L2 chain like Optimism, you’ll
need to create an account on https://optimistic.etherscan.io/ and then get that
site’s API key. Not all of the block explorers made by Etherscan have API keys.
The Remix Contract Verification — Etherscan plugin only works where you can log
in to that block explorer to get an API key.

Once the API key is input, the plugin’s homepage is opened for verification.

The network is selected in Deploy & Run, and in your browser’s wallet (if you’re
using one). You will need to have compiled the contract, and of course, you will
also need to have deployed the contract.

VERIFYING CONTRACTS WITH CONSTRUCTOR ARGUMENTS

As of this release, you no longer need to input the encoded constructor
arguments.

You can input them just like you did when you deployed the contract.

VERIFYING A PROXY CONTRACT

Upgradeable contracts using the UUPS design pattern can now be verified in the
Etherscan plugin. Before verifying a proxy contract, the implementation contract
must already be verified.

THE IMPLEMENTATION CONTRACT PART

If you haven’t already verified the implementation contract, don’t check the
proxy box when verifying the implementation. Just verify the implementation
contract like a standard contract.

Then, and only then should you continue to verify the proxy contract.

THE PROXY CONTRACT PART

To verify the proxy (just after you’ve verified the implementation):

Click the It’s a proxy contract address checkbox.

Copy the implementation contract’s address from the Contract Address box and
paste it into the Expected Implementation Address box.

Then, paste the proxy contract address into the Contract Address box and
click Verify.

GENERATE VERIFICATION SCRIPTS

Clicking the Generate Verification Scripts button will create a folder named
etherscan in the Workspace’s scripts folder that contains .ts files for
verifying and returning the receipt status.


UPDATE TO THE WALLETCONNECT PLUGIN

As of 28 June 23, DApps and wallets that use WalletConnect will need to use
WalletConnect v2.0. The Remix WalletConnect plugin is ready for the upgrade.
Keep in mind that not all mobile wallets will work when the upgrade has
happened. Check for news about this on your mobile wallet’s docs, or here.


THANK YOU REMIX SUMMERTIME USERS

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We have migrated our community channels off Gitter and on to Discord. Although
we still follow the discussions on Gitter (now through Matrix), we encourage you
to move over to our Discord server. Or, send us an email at remix@ethereum.org!

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

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16 May



REMIX RELEASE V0.33.0

Author: Rob Stupay

Remix is dedicating this late Spring release to the lovers out there connecting
their hearts and, uhh… wallets — or at least connecting their mobile wallets to
Remix as well as telling each other the many ways they love each other, and then
inputting grand totals into a function’s argument using scientific notation.

You see, Remix is for lovers!


BIG NEWS

 * Updates to the WalletConnect plugin
 * Scientific Notation comes to Deploy & Run — so stop counting those zeros!!
 * Etherscan verification plugin updates
 * Generate documentation with a right-click in the File Explorer


WALLETCONNECT

Approve transactions on your phone’s mobile wallet by using WalletConnect. In
this release, we’ve refactored the plugin and have moved it into Remix’s
codebase.

WalletConnect is great for mimicking how your users will approve transactions in
your dApp.

Compile a file, then in Deploy & Run, at the bottom of the Environments select
box, choose WalletConnect.

WalletConnect will appear in the main panel in an Editor tab.

Hit the Connect to a wallet button. Then scan the QR code with your mobile
wallet and approve the connection to Remix.

The network that your mobile wallet is connected to will display in the “badge”
underneath the Environment section of Deploy & Run.

Switching to a different network is done in the mobile wallet itself.

The chain ID of the chain you are connected to will be shown in Deploy & Run.


SCIENTIFIC NOTATION IN FUNCTION INPUTS

Scientific notation can now be used for numbers passed as function arguments.
This means that instead of inputting 12000000000000000000, you can input 12e18.

Scientific notation will also work in an array or as a single input.

For arrays the input looks like this:

Thanks again for the suggestion, Paul! Keep ’em coming!


ETHERSCAN UPDATES

In this release, we’ve updated the Etherscan plugin.

To verify a contract, compile it and then deploy to a public network. Activate
the Etherscan plugin and input your Etherscan API key. Then choose the contract
you want to verify and input the contract’s address.

Then click Verify.

If you are connected to the wrong network, change it in Deploy & Run.


DOCUMENTATION GENERATOR IN THE FILE EXPLORER’S RIGHT-CLICK MENU

Remix’s Documentation Generator is now integrated into the File Explorer’s
right-click menu. Of course, to generate the documentation the contract needs
NatSpec comments in it.

To generate the documentation, right-click on a file in the File Explorer and
choose the Generate Docs option from the menu.

The documentation will be displayed in an Editor tab. The associated markdown
file will be created in the docs folder.


SOL2UML

We’ve added a magnifying cursor to the UML viewer, and now the scroll wheel on
the mouse controls zoom instead of position. Moving around the diagram can be
done with the browser’s scroll bars.


THANK YOU, THANK YOU, AND…

Please report any problems you find in Remix. And, as always, please send us any
suggestions about changes you’d like to see in Remix, or any functionality you
think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We have migrated our community channels off Gitter and on to Discord. Although
we still follow the discussions on Gitter (now through Matrix), we encourage you
to move over to our Discord server. Or, send us an email at remix@ethereum.org!

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

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04 Apr



REMIX IDE V0.32.0 RELEASE

Author: Rob Stupay

> “In the spring, at the end of the day, you should smell like dirt.”

> — Margaret Atwood

After going through Remix’s April release, you should smell like blockchain.


BIG NEWS

 * Upload a folder to a Workspace
 * Github Actions can now include Forking
 * Free Functions have come to Remix
 * EthDoc creates MD files
 * Trust Wallet in Remix


UPLOAD A FOLDER TO A WORKSPACE

Suppose you have a folder full of files on your hard drive that you’d like to
bring into Remix. Previously, you could have shared this folder with Remixd to
connect it to Remix, but you would also have needed to run Remixd.

Now, you can upload a folder directly to a Workspace.


DOWNLOAD A WORKSPACE

We have also added an option in the Workspace hamburger menu for downloading the
current Workspace.

NOT NEW TO THIS RELEASE BUT RELATED:

 * To download all of your current Workspaces, choose the Backup option.
 * To download a file or a folder in a Workspace, right-click on its name, and
   choose the Download option from the context menu.


UNIT TEST WITH A GITHUB ACTION ON A FORKED BLOCKCHAIN

In the Workspace hamburger menu, previously there were three options for adding
GitHub actions: Solidity Unit Testing, Mocha Chai Unit Testing, and Slither
Analysis.

In release v0.31.0, we brought forked chains to Remix. In this release, we bring
the forking to GitHub actions. You can choose a chain to fork, as well as the
block number and the EVM version.

Once you have committed and pushed to GitHub from Remix, you are set!
For more info about GitHub actions in Remix, see our blog post on the subject.


FREE FUNCTIONS IN REMIX

Free functions are functions that run outside of a contract.

> Mainly useful when prototyping, but it also makes sharing code easier than
> with libraries.

> — Paul Razvan Berg

You can now run free functions by right-clicking on the function and you’ll see
the Run the free function option.

Thanks for the suggestion Paul! Keep your suggestions coming!


GENERATE UML — DOWNLOAD OPTION

We’ve been updating the Generate UML option. You can now download a PDF or a PNG
file of your UML diagram.

To generate a UML diagram, right-click on a .sol file, and in the context menu,
select the Generate UML option. The diagram will come up in an Editor tab called
Solidity UML Generator.


DOWNLOAD COMPILATION DETAILS

The button to view compilation details is visible in the Solidity Compiler after
a file has been successfully compiled. Now these details can be downloaded.


TRUST WALLET IN REMIX

There is an expanding list of Browser Wallets. These wallets are installed as
browser extensions. It is best practice to only have one these activated in your
browser for use with Remix.

Pick the wallet of your choice. Switch wallets in the browser settings for
extensions.


DEFAULT WORKSPACE NAMES

We’ve renamed the default workspace to Basic and we have changed the number
after the name to a simple incremented integer.

You can always rename a Workspace to whatever your heart fancies.


DOCUMENTATION GENERATOR

We are in the process of updating DocGen, the plugin that creates documentation
out of NatSpec comments. This plugin is activated in the Plugin Manager. In a
future release, it will be accessed by right-clicking on a file in the File
Explorer, so stay tuned. The update in this release is that DocGen now creates a
markdown file and places the .md file in the docs folder.


THANK YOU WONDROUS USERS

Please report any problems you find in Remix. And as always, please send
suggestions about any changes you’d like to see in Remix, or any functionality
you think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this form.

We have migrated our community channels off Gitter and on to Discord. Although
we still follow the discussions on Gitter (now through Matrix), we encourage you
to move over to our Discord server. Or, send us an email at remix@ethereum.org!

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

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01 Mar



REMIX RELEASE V0.31.0 — A FORKING GOOD TIME

Author: Rob Stupay


REMIX RELEASE V0.31.0 — A FORKING GOOD TIME

> When you come to a fork in the road, take it.
> - Yogi Berra


THE BIG NEWS

 * Chain Forking! Fork a chain and play with it on the Remix VM. Works for
   Ethereum Mainnet, testnets, or the chain of your choice, all at the block
   number of your choice.
 * New Proxy Contract Upgrade checks
 * Download files and folders with a right-click
 * Zooming on UML diagrams
 * New version of Remixd v0.6.12 — DOWNLOAD IT NOW!
   npm install -g @remix-project/remixd


FORKING

You can now fork chains so that you can play with them on the Remix VM. This is
a great technique if you want to develop a contract that interacts with deployed
contracts on Mainnet. By forking Mainnet to the Remix VM local chain, you can
experiment more effectively in a local environment with test ETH.

To fork, go to the Environment select box of the Deploy & Run module.

You’ll see the four fork choices. When you select Mainnet, Sepolia, or Goerli
fork, the chosen chain will load into Remix. It may take some time to load,
depending on your connection speed. Once loaded, you’ll see ten accounts loaded
with 100ETH each.

Careful though. If you refresh the browser, you’ll lose the forked chain.

CUSTOM FORK — REMIX VM

When you choose the Custom fork a modal will pop up.

You can get the Node URL from chainlist.org. If the chain does not load, you may
need to choose a different RPC server. You will also need to choose an EVM
version appropriate to the block number. So if you choose a very old block
number, the EVM with the Merge “flavor” won’t work because this version of the
EVM came out later.


NEW CHECKS FOR PROXY CONTRACT UPGRADES

UPDATES TO HANDLING PROXY CONTRACTS

Remix has a UI for dealing with upgradeable contracts using the UUPS design
pattern. For more info about using Proxy contracts on Remix see our docs.

As of this release, Remix saves a list of the previously deployed proxy
contracts.

As you can see above, Remix displays previously deployed contracts that use this
pattern. On rollover, the tooltip will show the date of the deployment. This
information is deployed in the .deploys folder in the File Explorer.

Remix saves the storage layout and compiler solc inputs of all UUPS deployments.

NEW CHECKS

Now that the previously deployed upgradeable contracts are being saved, Remix
can make some tests to ensure that you are upgrading the right contract.

Remix checks the .deploys folder, and if it finds the contract, a comparison is
made with the upgrade. If there is an incompatibility, a warning modal
containing a list of the issues will pop up before the new contract deploys:

If the previous contract is not in the .deploys folder, Remix cannot make the
comparison, so this warning will pop up:

This warning simply means that Remix cannot make the comparison because the
previous contract is not in the .deploys folder. It might be a perfectly good
upgrade. Indeed, everyone who has made upgradeable contract deployments before
this release will get this warning.

Lastly, we have a simple check that makes sure a contract’s address is valid. If
it isn’t, you’ll get this warning:


MORE UPDATES TO THE ENVIRONMENTS SELECT BOX

The Environments select box has been updated and the code has been refactored.


FILE EXPLORER UPDATES

BACKUP A FILE OR FOLDER BY RIGHT-CLICKING ON IT

Now when you right-click on the name of a file or a folder (but not the icon)
you’ll get this popup menu:

Selecting Backup will download the file or folder to your computer.

AN UPDATE TO GENERATE UML IN THE FE RIGHT-CLICK MENU

In this release, you can now zoom in, move around the diagram, and zoom out.
Click the reset button to restore the original zoom level.

More updates are coming, so watch this space!


WARNING WHEN UPDATING A FILE OUTSIDE OF REMIX

As I hope you all know, Remixd connects a folder on your computer to Remix and
that you can connect to it by going to -connect to localhost- in the Workspaces
select box in the File Explorer. And, if you didn’t know that, now you do. To
find out more, see the docs.

But before I get to the new update, please download the latest version of Remixd
v0.6.12: npm install -g @remix-project/remixd

Now when Remixd is running (so a folder on your hard drive is connected with
Remix) and when you update a file in this shared folder from a tool outside of
Remix, a warning will pop up:


SOL COMPILER

The default Solidity Compiler is now v0.8.18.

In the Compiler’s Advanced Configurations section, we have also added the
Paris EVM.


FIXES

Flattener is updated. Calculation of gas execution costs has also been fixed.
And, in the FUNCTIONHASHES section of the Compilation Details modal, the
function hashes are now displayed.


THANKS YOU WONDROUS USERS

Please report any problems you find in Remix. Also, as always, please send
suggestions about any changes you’d like to see in Remix, or any functionality
you think would be useful to add.

For future releases, we are looking for more Beta Testers. If you are interested
in helping this effort please fill out this questionnaire.

We are migrating our community channels off Gitter and on to Discord. Although
we still follow the discussions on Gitter (now through Matrix), we encourage you
to move over to our Discord server. Or send us an email at remix@ethereum.org!

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

Remix Release v0.31.0 — a Forking Good Time was originally published in Remix
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- Welcome to Remix 0.20.0-dev -

You can use this terminal to:
 * Check transactions details and start debugging.
 * Execute JavaScript scripts:
   - Input a script directly in the command line interface
   - Select a Javascript file in the file explorer and then run
   \`remix.execute()\` or \`remix.exeCurrent()\` in the command line interface
   - Right click on a JavaScript file in the file explorer and then click
   \`Run\`

The following libraries are accessible:
 * web3 version 1.5.2
 * ethers.js
 * remix (run remix.help() for more info)


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