Update Foundry + Blockscout contract verification docs

[2manslkh]

Issues with verifying contract with foundry on blockscout.

foundry-rs/foundry#4909

https://guide.scroll.io/developers/verifying-smart-contracts

Todos:

• Add alert on docs to inform users of issues
• Update docs when fix is available

[dionysuzx]

curious whats the status here, do we think it's a blockscout version issue? this is the docker image version we are using: FROM blockscout/blockscout:5.1.5

[kshyun28]

Hello @2manslkh, was trying to follow the guide for deploying and verifying contracts with foundry on Taiko.

Was able to deploy a contract just fine since the guide is available.

For verifying, I saw this issue you made, but foundry #4909 issue was already closed.

My assumption is that we can finally verify contracts using foundry.

Hence, I tried to verify using the following command
forge verify-contract 0xCAba40113D27e67676BEdFE9170BB5956a9F6F85 src/Counter.sol:Counter --chain-id 167005 --verifier-url https://explorer.test.taiko.xyz/api --verifier blockscout

But got this error instead:

Start verifying contract `0xcaba40113d27e67676bedfe9170bb5956a9f6f85` deployed on 167005
Error:
Response result is unexpectedly empty: status=0, message=Something went wrong.

Let me know if I missed anything or if there's anything else I can help with.

[2manslkh]

I am getting this error too 😓

[MarcusWentz]

I get this error too on other networks using Blockscout.

Example:

Guide
https://guide.scroll.io/developers/verifying-smart-contracts#foundry
Test Foundry repo
https://github.com/MarcusWentz/foundry-testing
Test command

forge verify-contract 0xC08bAe25c62Dc5488AC46905ADDe1609b52A3844 src/Contract.sol:SimpleStorage --chain-id 534353 --verifier-url https://blockscout.scroll.io/api --verifier blockscout

Response

Start verifying contract `0xc08bae25c62dc5488ac46905adde1609b52a3844` deployed on scroll-alpha-testnet
Error: 
Response result is unexpectedly empty: status=0, message=Something went wrong.

I updated Foundry with

foundryup

Which updated me to

forge 0.2.0 (0e72b71 2023-07-19T00:31:45.646186071Z)

but I see this issue still.

[MarcusWentz]

I get a different error on the updated Blockscout explorer the Taiko L3 explorer is using as described here:
blockscout/blockscout#7983

[MarcusWentz]

I think this might work if you add \? to the end of the Blockscout verification URL.

Test verification on Scroll

forge verify-contract 0xC08bAe25c62Dc5488AC46905ADDe1609b52A3844 src/Contract.sol:SimpleStorage --chain-id 534353 --verifier blockscout --verifier-url https://blockscout.scroll.io/api\?

Response

Start verifying contract `0xc08bae25c62dc5488ac46905adde1609b52a3844` deployed on scroll-alpha-testnet

Submitting verification for [src/Contract.sol:SimpleStorage] "0xC08bAe25c62Dc5488AC46905ADDe1609b52A3844".
Submitted contract for verification:
        Response: `OK`
        GUID: `c08bae25c62dc5488ac46905adde1609b52a384464bec9dd`
        URL:
        https://blockscout.scroll.io/address/0xc08bae25c62dc5488ac46905adde1609b52a3844

Source
foundry-rs/foundry#5160 (comment)

[MarcusWentz]

On Taiko L2 when I run

forge verify-contract 0x860eAfD65249D09268A314D7d56d686d4784A5a5 src/Contract.sol:SimpleStorage --chain-id 167005 --verifier blockscout --verifier-url https://explorer.test.taiko.xyz/api\? 

I get

Start verifying contract `0x860eafd65249d09268a314d7d56d686d4784a5a5` deployed on 167005

Submitting verification for [src/Contract.sol:SimpleStorage] "0x860eAfD65249D09268A314D7d56d686d4784A5a5".
Submitted contract for verification:
        Response: `OK`
        GUID: `860eafd65249d09268a314d7d56d686d4784a5a564beccda`
        URL:
        https://explorer.test.taiko.xyz/api?/address/0x860eafd65249d09268a314d7d56d686d4784a5a5

However on Taiko L3 when I run

forge verify-contract 0xfE854EB335786037aDb33C36936f679CA127C3CD src/Contract.sol:SimpleStorage --chain-id 167006 --verifier blockscout --verifier-url https://explorer.l3test.taiko.xyz/api\?

I get error

Start verifying contract `0xfe854eb335786037adb33c36936f679ca127c3cd` deployed on 167006
2023-07-24T19:13:02.975541Z ERROR etherscan: Failed to deserialize response: expected value at line 1 column 1 ...
Error: 
expected value at line 1 column 1

Similar to error
blockscout/blockscout#7983

[MarcusWentz]

This is working on L2:

forge create --rpc-url https://rpc.test.taiko.xyz/ --private-key $devTestnetPrivateKey src/Contract.sol:SimpleStorage --verify --verifier blockscout --verifier-url https://explorer.test.taiko.xyz/api/?

[MarcusWentz]

This is working on L3:

forge create --rpc-url https://rpc.l3test.taiko.xyz --private-key $devTestnetPrivateKey src/Contract.sol:SimpleStorage --verify --verifier blockscout --verifier-url https://blockscoutapi.l3test.taiko.xyz/api\?

[MarcusWentz]

Fixed issue and opened this documentation pull request:

#14266