{"op":"convert","value":1.0,"from":"nautical_mile","to":"meter","dimension":"length","result":1852.0,"conversion_factor":1852.0,"exact":true,"source":"NIST SP 811 (2008), Appendix B; BIPM SI Brochure 9th ed.","attestation":{"attested":true,"endpoint":"unit","inputs":{"value":1.0,"from":"nautical_mile","to":"meter"},"output_sha256":"f39b3f17dc2c2d14cd1256d830992f336deda5e2ad9f24d6fc974bc4d341c085","authority":{"name":"NIST SP 811 (2008), Appendix B + BIPM SI Brochure (9th ed.)","version":"SP 811 / SI 9th ed.","engine":"exact-factor table (SI base) + affine temperature","matches_published_test_values":"NIST exact conversion factors (1852 m/nmi, 0.45359237 kg/lb, 101325 Pa/atm, -40°C=-40°F)"},"deterministic":true,"reproduce":"recompute /unit with these inputs against NIST SP 811 (2008), Appendix B + BIPM SI Brochure (9th ed.); same input -> same bytes; sha256 of the canonical (sorted, attestation-stripped) JSON output must equal output_sha256.","signature":{"signer":"0xA947551dEBB8F0171F16311b1Ce8b5A8f59A8814","scheme":"EIP-191 personal_sign (secp256k1)","statement":"almanac/v1 attests: endpoint=unit output_sha256=f39b3f17dc2c2d14cd1256d830992f336deda5e2ad9f24d6fc974bc4d341c085","signature":"0xaee5455eb38890906e77e056768a92b4f9a8e76f3f75d8c3a8bbbe8e3988d4491d2436053e85fb7d0707d885761568925ad7ce1a05d9ece6409e2d692520b6921c","verify":"EIP-191 recover the signer address from (statement, signature); it must equal `signer`. `signer` is almanac's attestation key — see `endorsed_by` for the earning wallet that authorized it.","endorsed_by":{"earning_wallet":"0xa3091005a76b1480F1897a9D0C2e1c55B7767674","attestation_key":"0xA947551dEBB8F0171F16311b1Ce8b5A8f59A8814","statement":"almanac/v1 endorsement: earning wallet 0xa3091005a76b1480F1897a9D0C2e1c55B7767674 authorizes attestation key 0xA947551dEBB8F0171F16311b1Ce8b5A8f59A8814 to sign deterministic-truth attestations","signature":"0xce89c47280aa480298974acfbcc7b03ee538a24a47e3dc733889261083edcdb01bb3849b2ba892c086c4528f74a37c06df5311dfd2734f232636343f067630621b","scheme":"EIP-191 personal_sign (secp256k1)","verify":"EIP-191 recover the signer from (statement, signature); must equal earning_wallet — the same address that receives x402 payment."}}}}