The term Yankee and its contracted form Yank have several interrelated meanings, all referring to people from the United States. Their various meanings depend on the context, and may refer to New Engl
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a5ebf62bed7af7d4318d038b3f1d8bb256765af4bbd0ce95e7769e8b1fdba2. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a93e27c3-cfa1-453c-b7ff-060b4d5e3874.json and https://artists.proofprofile.net/proofs/artist/a93e27c3-cfa1-453c-b7ff-060b4d5e3874.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).