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 0x5340ac53b9e9bce034b64ad5b4eac2354b57fe6ee1d159302397ed3f3bafc85a. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed15a2f8-50bf-4000-a270-18224ad59a8a.json and https://artists.proofprofile.net/proofs/artist/ed15a2f8-50bf-4000-a270-18224ad59a8a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Santelmann, Vol. 5 of the Robert Hoe Collection
Santelmann, Vol. 3 of the Robert Hoe Collection
Santelmann, Vol. 4 of the Robert Hoe Collection
Santelmann, Vol. 12 of the Robert Hoe Collection
Santelmann, Vol. 10 of the Robert Hoe Collection
Santelmann, Vol. 6 of the Robert Hoe Collection
Santelmann, Vol. 8 of the Robert Hoe Collection
Santelmann, Vol. 9 of the Robert Hoe Collection
Santelmann, Vol. 14 of the Robert Hoe Collection
Santelmann, Vol. 11 of the Robert Hoe Collection
The American Bandmasters Association Commemorative Recording Series: William F. Santelmann