Ensure hardhat-verify plugin works properly in our Sourcify instance

[acuarica]

There is a Hardhat plugin that allows developers to verify contracts using Etherscan and Sourcify.

Developers who use Hardhat in their workflow may use this plugin for verification. So it's important for our users to support this plugin as well. Moreover, we can leverage this plugin as an e2e test when we expose API access for our Sourcify instance.

It looks like this plugin allows for API endpoint customization. See https://github.com/NomicFoundation/hardhat/blob/377796b177deb1bb3585d4460c0dc9bd0f3a98b1/packages/hardhat-verify/src/internal/config.ts#L34-L46. We may be able to use this to point to our instance.

Ultimately, we need to ensure a developer who installs hardhat-verify and configure the verification with our instance, can run npx hardhat verify successfully.

[svienot]

I made a very quick tour of the toolsets listed by sourcify.dev in this issue: #597

[acuarica]

They added this new configuration recently NomicFoundation/hardhat@8ce5602 😄 . We should be able to integrate with this plugin.

[acuarica]

Confirmed that our sourcify instance works with hardhat-verify plugin. Docs have been added in

• docs: include hardhat-verify plugin verification instructions #127

[acuarica]

Although it works, there might be an unrelated Etherscan error showing in the hardhat output. To suppress it, it is needed to manually disable Etherscan verification since hardhat doesn't do it automatically[1]

etherscan: {
  enabled: false,
}

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[1] NomicFoundation/hardhat#4776 (comment)