[bug] Invalid signature when using smart accounts with SIWE

[kenjicncr]

Link to minimal reproducible example

https://github.com/reown-com/web-examples/tree/main/dapps/appkit-siwe

Summary

Description

When attempting to sign in with a smart account using Sign-In with Ethereum (SIWE), the signature verification is failing despite the signature being correctly formatted and coming from a valid smart account.

Since email sign-ups default to smart accounts, this make them unuseable for verifcation

Current Behavior

• Smart account signature verification fails with "Invalid signature" error
• The signature is properly formatted and starts with 0x
• Using @reown/appkit-siwe for verification

Expected Behavior

• Smart account signatures should be properly verified
• Authentication should succeed with valid smart account signatures

Reproduction Steps

1. Set up Next.js app with @reown/appkit-siwe
2. Configure NextAuth with SIWE
3. Attempt to sign in with a smart account
4. Observe signature verification failure

Example Signature

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...

Environment

• Next.js App Router
• @reown/appkit-siwe: latest
• next-auth: latest

Additional Context

The signature format indicates this is coming from a smart account rather than an EOA wallet. The verification process needs to handle smart account signatures differently from regular EOA signatures.

List of related npm package versions

@reown/appkit-siwe: latest
next-auth: latest

[elix1er]

got the same. drove me nuts. wait for appkit // siwe v1.5.0 release bump soon, fixes been FINALLY merged. 🚀

[elix1er]

@magiziz ETA public release ?

[kenjicncr]

@elix1er thanks glad i'm not the only one.

for some reason, one click sign w/ solana stopped working as well. the modal just stopped showing anymore

[elix1er]

pull the latest now. or @canary.