{"algorithm":"Ed25519","publicKeyHex":"0e1b40472f388090c765bfeb6c67b9eedbfeba7cfb194fdf47f5b2dc333251e6","purpose":"x402 Uptime-Canary Settlement-Probe MCP signing only (separate from the receive wallet's EVM key)","note":"Re-check a signed uptime-canary probe envelope FREE at POST /v1/mcp/verify/uptime/recheck"}