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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493b7490354b43baf4299833da4c6b13d3683bbe086b926ae5cda4a6150e3f7d. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9b94388-abab-401b-b24e-a41a46845005.json and https://artists.proofprofile.net/proofs/artist/e9b94388-abab-401b-b24e-a41a46845005.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem, Op. 48 (1893 Version): IV. Pie Jesu
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c902ffb8a5a6c6257b1b15cb3bab0fdf7d77d3e5fa8ac31f51f10fa4fa62aa. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAJY8929204.
Iphigénie en Tauride / Act 1: Introduction et choeur. "Grands Dieux ! soyez-nous secouables"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311001f1c78234c87240986bc5592e9a6e0406562b336106a6740639e97d79f7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA508401501.
Christmas Music from Medieval and Renaissance Europe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ce5ce1ef955ef5a7541cc0ac07fb967ad4b2a9d37f0be3aa931cf42b7eea0b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAJY8726306.
Musikalische Exequien, SWV 279/281: Part I:Concert in Form einer teutschen Begräbnis-Missa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f0dd04734c4eab35492985f1e67b5b6665e53f15b47aab841d5018dc41018b. 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/DEF058703290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc618edd5be565e686c46699461eb63db1c2e70d3508552759751e66e76b3be3. 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/GBAKR8810720.
Fauré: Requiem; Cantique de Jean Racine; Messe basse; 2 Motets, Op. 65
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c902ffb8a5a6c6257b1b15cb3bab0fdf7d77d3e5fa8ac31f51f10fa4fa62aa. 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/GBAJY8929204.
Raise, Raise the Voice, Z. 334: IV. Mark How Readily Each Pliant String
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e798791e59d258d2ccb09564dbe22dbb4cf3ff863959564d600e56d18ef5dc. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/GBAJY9401513.
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