Sign message via coinbase generates invalid signature

[AndreyBS1]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Describe the bug

What I am doing:

1. Connect wallet via "metaMask" / "coinbase" connector.
2. Use "signMessage" / "signMessageAsync" from "useSignMessage".

What I expected:

Same signatures from MetaMask and CoinBase which I can verify with "verifyMessage" from "viem"

What is actually happening:

Signature from CoinBase is invalid: it's much longer and contains a lot of "0" chars. Also I can't verify it.

I tried to transform message to hash, to bites and prepare message through siwe library (according to CoinBase Smart Wallet documentation), but result was always the same.

Link to Minimal Reproducible Example

No response

Steps To Reproduce

// use-sign-message.ts
export const useSignMessage = () => {
const { isConnected, address } = useAccount()
const { signMessageAsync } = useSignMessage()

const sign = async () => {
if (!isConnected || !address) {
throw new Error('Wallet is not connected')
}

  const message = 'message'
  const signature = await signMessageAsync({ message })
  console.log('signature:', signature)
  // With MetaMask --- "signature: 0xc41fc1885f5bf07fd63ad159104b88300dba8847455ab15c350931ea7aba8e980f6010b315dcba426be097b6d0e5fe43946cba2f7d8df59ca9797bca9f106fda1c"
  // With CoinBase --- "signature: 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"

  return signature

}

return { sign }
}

What Wagmi package(s) are you using?

wagmi

Wagmi Package(s) Version(s)

2.13.3

Viem Version

2.19.1

TypeScript Version

5.5.4

Anything else?

react version: 18.3.1
vite version: 5.3.5

[github-actions]

Hello @AndreyBS1.

Please provide a minimal reproduction using StackBlitz, TypeScript Playground (for type issues), or a separate minimal GitHub repository.

Minimal reproductions are required as they save us a lot of time reproducing your config/environment and issue, and allow us to help you faster.

Once a minimal reproduction is added, a team member will confirm it works, then re-open the issue.

[github-actions]

This issue has been locked since it has been closed for more than 14 days.

If you found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest Wagmi version. If you have any questions or comments you can create a new discussion thread.