Deterministic signature test

Every wallet signs the same EIP-712 message. If ECDSA signing is deterministic (RFC 6979), the same key must produce the same 65-byte signature every time, in every wallet. That signature is what a privacy key would be derived from, so nothing needs to be stored.

1. The fixed message

Domain has no chainId, so the signature is the same on every network.

  
EIP-712 digest: 






  
2. Injected wallets (EIP-6963 + window.ethereum)

  
Import the same secret into several wallets, then sign with each. Serve this page over http; extensions do not inject into file://.

  
Looking for wallets…

  






  
3. In-browser wallet (ethers.js, kept in localStorage)

  

    

      
      or import one:
    

    
    

  

  





  
4. Signatures (persisted in localStorage)

  

  

  

    
#whensourceaddresssignaturerecoveredderived secret = keccak256(sig)

    
  

  

  

    
    
  






  
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