{"algorithm":"Ed25519","publicKeyHex":"0e1b40472f388090c765bfeb6c67b9eedbfeba7cfb194fdf47f5b2dc333251e6","purpose":"x402 Budget-Preflight-Gate MCP signing only (separate from the receive wallet's EVM key)","note":"Re-verify a signed allow/deny decision by re-supplying the SAME {agent_id, action_amount_usd, policy} + decidedAt: recompute the SHA-256 of the canonical evidenceCore and verify ed25519Sig against publicKeyHex."}