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CLOSED Gitcoin: 5) Deploy the ERC20 Proxy Contract for the Deposited SUDT #6

Closed matt-quinn closed 1 year ago

matt-quinn commented 3 years ago

This task is capped at maximum 150 submissions; so be in the first 150 valid submissions to get your payout!

5. Deploy the ERC20 Proxy Contract for the Deposited SUDT

In order to use SUDT tokens that have been moved between Layer 1 and Layer 2, you will need to deploy the ERC20 Proxy Contract to interact with them. This special Solidity smart contract has been prepared by the Nervos team to allow EVM to interact with SUDT tokens on Nervos.

The ERC20 Proxy Contract is a modified ERC20 Solidity contract where the token balance and transfer functions have been modified to interact directly with the Polyjuice EVM compatibility layer. This allows Ethereum smart contracts to use an ERC20 interface to work with SUDT tokens on Layer 2.

Task Instructions

Note: Before starting the tasks, it is recommended that you review the Task Submission section so you know what materials you will need to provide to judges to review your task submission.

We will use some example code that you will need to populate with values such as your private key and Ethereum address. After updating the values, we will execute the script to deploy the ERC20 Proxy Contract, and we'll then use it to check your SUDT balance on Nervos' Layer 2!

Note: Your private keys are used to secure your accounts and all the funds and assets contained within. It is important to keep your private keys safe, and to only use them with tools you can trust. However, on these tasks we will only be working with Testnet funds and assets that have no value. You can operate without concern knowing that there is nothing at risk.

Prerequisites

To deploy the ERC20 Proxy Contract, also known as the SUDT-ERC20 Proxy Contract, you need to first have a Layer 2 SUDT ID. This can be found by depositing an SUDT to Layer 2 using the account-cli tool, which was done in the previous task. If you have not completed this task, please do so before proceeding.

This task requires the Gitcoin Task Instruction Examples repo (gw-gitcoin-instruction) which was setup in task 2. If you do not have this repo available for any reason, please set it up now.

1. Compile the Smart Contract and Copy the Artifact

Before you deploy a smart contract you need to compile it. Our instructions will show you how to quickly compile a smart contract using the Truffle compiler.

The SUDT-ERC20 Proxy Solidity smart contract below is SudtERC20Proxy.sol, and it is located in the `gw-gitcoin-instruction/src/examples/5-erc20-proxy/contracts/SudtERC20Proxy.sol file.

The command below can be used to compile the Solidity into EVM bytecode using the Truffle compiler. This process will use Docker. If you do not have Docker installed, please revisit the task setup and requirements page.

cd ~/projects/gw-gitcoin-instruction/src/examples/5-erc20-proxy
yarn compile

After the command is complete you will find the compiled file in the build/contracts directory. ie: src/examples/5-erc20-proxy/build/contracts/ERC20.json

2. Deploy the SUDT-ERC20 Proxy Contract Using Web3.js

Next we will use the example code to deploy the smart contract. Open the file src/examples/5-erc20-proxy/index.js in an editor of your choosing. You will need to update the values in index.js to match your Ethereum private key and SUDT ID.

Ethereum Private Key

This private key will be used to deploy the smart contract, and it should be the same Ethereum private key that funds were added to in the previous tasks. Make sure you use your Ethereum private key for Layer 2, not your Nervos CKB Layer 1 private key. Replace <YOUR_ETHEREUM_PRIVATE_KEY> with this value. Always make sure your private key is prefixed with "0x".

const ACCOUNT_PRIVATE_KEY = '<YOUR_ETHEREUM_PRIVATE_KEY>';

SUDT ID

The SUDT ID is needed by the deployed contract in order to associate it with a specific SUDT token. This creates a 1:1 binding between the Ethereum smart contract and the Layer 2 SUDT token that cannot be changed once deployed. Replace <YOUR_SUDT_ID> with the SUDT ID from the token you created earlier.

const SUDT_ID = '<YOUR_SUDT_ID>';

SUDT_NAME, SUDT_SYMBOL, and SUDT_TOTAL_SUPPLY

The other constant values SUDT_NAME, SUDT_SYMBOL, and SUDT_TOTAL_SUPPLY can be left as is. They are provided for compatibility reasons with ERC20, but these values don't have any effect at this time.

Run the Script

After all values have been replaced, use the following commands in a console to execute the script.

cd ~/projects/gw-gitcoin-instruction/src/examples/5-erc20-proxy
node index.js

After running the command, the contract should deploy without any errors. You will be presented with a transaction hash, and an Ethereum contract address. The transaction hash is provided by Godwoken, and Ethereum contract address is provided by Polyjuice. Keep track of these values as they will be needed in the future tasks and for task submission.

Example Output:

➜ node index.js
Using Ethereum address: 0xD173313A51f8fc37BcF67569b463abd89d81844f
Deploying contract...
Transaction hash: 0xcfa9a2e6d691fd095b4cb2edbea3437bd6de7fedd210e8a55c2ccc5c24b32ad5
Deployed SUDT-ERC20 Proxy contract address: 0xc013772cAAaBf6ca3F584B6D7b98e73a701233b5

3. Check your Layer 2 SUDT balance

Once the SUDT-ERC20 proxy smart contract has been deployed for your SUDT, you can check the token balance for any account. This can be done by calling the ERC20ProxyContract.balanceOf method. It accepts the account or smart contract address as first and the only argument. One important thing to remember though is that this is a Polyjuice address, not your Ethereum address. When dealing with addresses on-chain in smart contract calls, you will almost always want to use Polyjuice address.

What is a Polyjuice address, you ask? A Polyjuice address is the address that Nervos' Layer 2 uses internally to track the Ethereum address behind it. The concept of Polyjuice address exists because of the cross-chain Layer 2 architecture used by Nervos. It is not possible to use the Ethereum address on Nervos Layer 2 because Nervos Layer 2 is designed to also support many other type of blockchain accounts. The addresses from all these different blockchains must be standardized to a single format that Nervos can utilize internally.

Don't worry though, it's extremely easy to go from the Ethereum to Polyjuice address and vice-versa. The example code to demonstrate this is included in examples/5-erc20-proxy/check-sudt-balance.js. You can also use account-cli tool to do a one time conversion using command-line. The instructions for account-cli can be found here.

Next we will check an SUDT balance using the provided example code. Open the file src/examples/5-erc20-proxy/check-sudt-balance.js in an editor of your choosing. You will need to update the values in index.js to match your Ethereum address and the ERC20 Proxy Contract address.

Ethereum Address

The script will need to know which Ethereum address we will check the balance of. Replace <YOUR_ETHEREUM_ADDRESS> with the Ethereum address that you previously deposited your SUDT to.

const ETHEREUM_ADDRESS = '<YOUR_ETHEREUM_ADDRESS>';

ERC20 Proxy Contract Address

You should have received SUDT-ERC20 proxy contract address as a result of previous step of this tutorial. Replace <YOUR_SUDT_PROXY_CONTRACT_ADDRESS> with the address of the deployed ERC20 Proxy Cntract.

const SUDT_PROXY_CONTRACT_ADDRESS = '<YOUR_SUDT_PROXY_CONTRACT_ADDRESS>';

Run the Script

After all values have been replaced, use the following commands in a console to execute the script.

cd ~/projects/gw-gitcoin-instruction/src/examples/5-erc20-proxy
node check-sudt-balance.js

Example Output:

➜ node check-sudt-balance.js
Using Ethereum address: 0xD173313A51f8fc37BcF67569b463abd89d81844f
Corresponding Polyjuice address: 0xa3cd0b1d997e5281dd574dd34155945febcf73a4
Checking SUDT balance...
80

Congratulations, the number you see at the end of the console output is the balance of SUDT tokens on Layer 2 for your Ethereum account!

You should see a value that is greater than zero since the instructions indicated that you should use the Ethereum account which already had tokens. If you see 0 then recheck the steps above starting with the Ethereum address.

Task Submission

To complete the tasks, add the following materials to a document on your Github and submit for review by the judges (include the link in your Gitcoin submission):

  1. A screenshot of the console output immediately after deploying smart contract.
  2. The address of the ERC20 Proxy Contract you deployed (in text format).
  3. A screenshot of the console output immediately after checking your SUDT balance.
  4. The Ethereum address that was checked (in text format).

Bonus: Get Layer 2 SUDT ID from Layer 1 SUDT Issuer Lock Hash (AKA SUDT Type Args)

If you have already deposited a SUDT and you don't know its Layer 2 SUDT ID there is a JavaScript code that you can use to retrieve it.

You need to prepare Layer 1 SUDT Issuer Lock Hash (AKA SUDT Type Args) and use src/examples/5-erc20-proxy/get-sudt-id.js.

Note: Remember to replace <YOUR_SUDT_TYPE_ARGS> inside the script before using it.

Helpful Links

gitcoinbot commented 3 years ago

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

Work has been started.

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  1. A screenshot of the console output immediately after deploying smart contract.
  2. The address of the ERC20 Proxy Contract you deployed (in text format).
  3. A screenshot of the console output immediately after checking your SUDT balance.
  4. The Ethereum address that was checked (in text format). 23) domix14 has started work.

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In order to use SUDT tokens that have been moved between Layer 1 and Layer 2, you will need to deploy the ERC20 Proxy Contract to interact with them. This special Solidity smart contract has been prepared by the Nervos team to allow EVM to interact with SUDT tokens on Nervos.

The ERC20 Proxy Contract is a modified ERC20 Solidity contract where the token balance and transfer functions have been modified to interact directly with the Polyjuice EVM compatibility layer. This allows Ethereum smart contracts to use an ERC20 interface to work with SUDT tokens on Layer 2. 63) dex68 has started work.

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gitcoinbot commented 3 years ago

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

Work for 4000.0 CKB (40.40 USD @ $0.01/CKB) has been submitted by:

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  103. @stwith
  104. @wangjianyeart
  105. @tharunrai14
  106. @armujahid
  107. @waverune
  108. @mistakeone
  109. @mrjacobsullivan
  110. @rzbck
  111. @kidneyweakx
  112. @zzhengzhuo
  113. @stgllr
  114. @baoanh1310
  115. @s1119858711
  116. @gapro8
  117. @knnlrts
  118. @celoaken
  119. @chiragbadhe
  120. @carlososuna11
  121. @jeasterman
  122. @nhaga
  123. @cesheep
  124. @pfed-prog
  125. @stefanofa
  126. @luiscrag
  127. @preet-aulokh
  128. @miklosbarabas
  129. @lofravaz
  130. @postman56
  131. @ulices2
  132. @dziobakwszafie
  133. @mashmzc
  134. @long-blade
  135. @awaissaeeed
  136. @yiniandawn
  137. @nabilanam
  138. @zyra-zia
  139. @walkertraylor
  140. @dorian333
  141. @misty444
  142. @sgnovo8
  143. @azmora
  144. @philippeomalley
  145. @feravasica
  146. @reiss2000
  147. @berkayermis
  148. @rncrypto06
  149. @quocson95
  150. @pulth
  151. @herzog5
  152. @haxyz
  153. @tanishqdsharma
  154. @hoangnd298
  155. @billkirschner
  156. @chaitanyasjoshi
  157. @u2rust
  158. @caneryy
  159. @elfelf2
  160. @superburst
  161. @ufrok1
  162. @meathewww
  163. @howinoc
  164. @mmcel
  165. @locvalucha
  166. @aliabdullah54
  167. @amitesh03
  168. @vivensy
  169. @sondq
  170. @michsss
  171. @quocson100
  172. @cocdap
  173. @kenyatta666
  174. @sunydev
  175. @dhruv035
  176. @selimkafa
  177. @iktumi
  178. @u1dxpool
  179. @deepansharya1111
  180. @thanhnhann
  181. @gentlebutapril
  182. @dikky88
  183. @ody123
  184. @raghav1997
  185. @gaspreth
  186. @jcervante
  187. @defaultrectr0
  188. @ajit766
  189. @hhuuaa
  190. @huazhouwang
  191. @thien-nguyen1308
  192. @fsy412
  193. @gdawson771
  194. @techmeupnl
  195. @icaroo
  196. @jackieyewang
  197. @rkr-dev
  198. @superheavytoken
  199. @ysongh
  200. @mxdui
  201. @terryboy
  202. @bulentbozdag
  203. @arnaudatcomet
  204. @kizna1ver
  205. @hdbhandari
  206. @stone-rocket
  207. @demoncash08
  208. @voldown
  209. @amrosaeed
  210. @crispysandwhich
  211. @andrewpsp
  212. @liushooter
  213. @jnditifei
  214. @chochinlu
  215. @puppetmaster66
  216. @hashan89
  217. @ykoyote
  218. @josemariasosa
  219. @playflycode
  220. @asfman
  221. @cuongtuanvu
  222. @food
  223. @schrubitteflau
  224. @rynsm4rt
  225. @deryyy
  226. @ppecotot
  227. @erredll
  228. @helmihidzir
  229. @flippinroo2
  230. @topma
  231. @larricane
  232. @earthnook
  233. @7kms
  234. @oceansxq
  235. @sharpcx

@mattquinn-nervos please take a look at the submitted work:

deryyy commented 3 years ago

not paying