SENDER_SIGNATURE_INVALID

The sender signature does not verify against the transaction bytes.

HTTP status	422
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

The signed payload and the transaction sent do not match — usually a field was changed after signing.

What to do

Rebuild the transaction, sign it once, and send exactly the bytes that were signed.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/sender-signature-invalid",
  "title": "The sender signature does not verify against the transaction bytes.",
  "status": 422,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "SENDER_SIGNATURE_INVALID",
  "retryable": false,
  "resign": "NONE",
  "hint": "Rebuild the transaction, sign it once, and send exactly the bytes that were signed."
}

See the error model for what each member means and how to handle unknown codes.