{"algorithm":"Ed25519","publicKeyHex":"0e1b40472f388090c765bfeb6c67b9eedbfeba7cfb194fdf47f5b2dc333251e6","purpose":"x402 Tool-Permission Threat-Model MCP signing only (separate from the receive wallet's EVM key)","note":"Re-check a signed threat-model envelope FREE at POST /v1/mcp/threatmodel/tool-permission/recheck"}