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 0xe81a5d088225e5b0544dc699eb074c69ced03943f9099d3b4b2df7764b294fad. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58e580c3-e73b-4aa1-967d-03090a3d3a73.json and https://artists.proofprofile.net/proofs/artist/58e580c3-e73b-4aa1-967d-03090a3d3a73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms: String Quartet, Quintet & Sextet
Horn Trio in E flat major, Op. 40: 1. Andante - Poco più animato
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xa34a61112660e1a5a8bf5b94b878dd6fbec0af33b80ac53eff183c6a55690b83. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056802301.
25 Scottish Songs, Op. 108: No. 1, Music, Love and Wine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a15517eb5e2ddc71de392a3d0b2e9b9daf57be3402acd640e3f75445ebca69. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057030400.
Clarinet Trio in A Minor, Op. 114: I. Allegro
Brahms: Complete String Quartets, Quintets & Sextets
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b734ab5cf63f2c7d308a7949c99d456d9b63cb20142c638995dbd5d66d19a8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056802311.
Clarinet Trio in A Minor, Op. 114: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ddd74e448fdfc0504a5a9e8c28fb0bbdefbd11748d59b5b73865bbe99d6d32. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056802312.
Clarinet Trio in A Minor, Op. 114: III. Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9832a7ea33f589867d522b30fdd4aeda85ab5a134a30853da0d427b90c4a5f8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056802313.
Clarinet Trio in A Minor, Op. 114: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3697bbafff5fb8f0156300ae994ce36ad0f803be0635263b02b1879eb849fc1f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056802314.