{"algorithm":"Ed25519","publicKeyHex":"0e1b40472f388090c765bfeb6c67b9eedbfeba7cfb194fdf47f5b2dc333251e6","purpose":"x402 MCP/A2A Tool-Permission Threat-Model MCP signing only (separate from the receive wallet's EVM key)","note":"Read back a signed threat-model attestation FREE at GET /v1/security/threatmodel/verify/{attestation_id}"}