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 0x064b8e2d38e13b6b6c70a3ab3c54448685504f76030b907f9b52ed18c06a88f2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c45bcdb6-121e-4ce3-9579-1a9534b368bc.json and https://artists.proofprofile.net/proofs/artist/c45bcdb6-121e-4ce3-9579-1a9534b368bc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Blues Brothers - Hits from the Broadway Musical
Hairspray - Hits from the Broadway Musical
42nd Street - Hits from the Broadway Musical
Little Shop Of Horrors - Hits from the Broadway Musical
Fiddler on the Roof - Hits from the Broadway Musical
Joseph and the Amazing Technicolor Dreamcoat - Hits from the Broadway Musical
Larson: Rent - Hits from the Broadway Musical