EthSignature

The EthSignature class represents an Ethereum signature.

Used to parse the signed result returned by the device.

Parameters

Parameter	Type	Description
`signature`	`Buffer`	The signature data (65 bytes: r + s + v)
`requestId`	`Buffer`	The request ID (optional)
`origin`	`string`	The origin information (optional)

UR Example


UR:ETH-SIGNATURE/OTADTPDAGDSWNNYAHGTOKPFPIAPANNROLNSAVYDTHHAOHDFPCATKCPPFYLENGAGLMKMUCAYKFPFSDREOMENTPKBGEONDCHFDNBKOSSTPDWETSGBZDNCMCHKPNYDMKIDPTDRYJSDRTKCTIOFPQZHFLNSKVACLMNIYTKLGISFRWLKTZTREAEAXIYGWJTIHGRIHKKPLGDEEDS

Decoding Example


import { URDecoder } from '@ngraveio/bc-ur';
import { EthSignature } from '@keystonehq/bc-ur-registry-eth';
 
const dec = new URDecoder();
// push each scanned frame string into the decoder
// dec.receivePart(frame)
 
if (dec.isComplete()) {
  const ur = dec.resultUR(); // ur.type should be 'eth-signature'
  const sig = EthSignature.fromCBOR(ur.cbor);
  
  const requestId = sig.getRequestId();
  const signature = sig.getSignature();
  
  // Extract r, s, v components
  const r = signature.slice(0, 32);
  const s = signature.slice(32, 64);
  const v = signature.slice(64, 65);
  
  // Attach to transaction and broadcast
}

Signature Format

The signature is 65 bytes:

r (32 bytes): First part of ECDSA signature
s (32 bytes): Second part of ECDSA signature
v (1 byte): Recovery ID