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 0x88c3d252ed16b274f049d0da3eeff0fb5af44523e007f31f6e731b399e657641. 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/e0021fd4-9312-46f6-973d-90a735a2d95a.json and https://artists.proofprofile.net/proofs/artist/e0021fd4-9312-46f6-973d-90a735a2d95a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x8031c76446949a34d5d79e3ed8e4c3fb43cc0771ca8f9e71a606b16e57904070. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES71G2411299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4493092ab8c1e8524de374b97b348aed84f95b4507d44e3e106d424a0123385f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES71G2411315.
Veinte Estudios Artísticos de Concierto para Violín Con Acompañamiento de un Segundo Violín: 1º Cuaderno: I. Estudio Melódico y del Saltillo
Jesús de Monasterio: Estudios Artísticos para Dos Violines (El Patrimonio Musical Hispano 9)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f750dc21c68f3ae10469e19cfe732c9337d2293b7c0ef7af24ed8f6fe322ad9. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ES98S1600156.
Veinte Estudios Artísticos de Concierto para Violín Con Acompañamiento de un Segundo Violín: 1º Cuaderno: VI. Estudio del Staccato a la Cuerda y Volante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648f26c9d2c83a62ee59ae22fe2fe925e1884b14d78ca2901fad712629be3cd3. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/ES98S1600161.
Veinte Estudios Artísticos de Concierto para Violín Con Acompañamiento de un Segundo Violín: 2º Cuaderno: II. Estudio de Trémolo de Mano Izquierda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94957564d39796c226c5ae36654600101034e549d608fff7df4bda1fa15f606. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/ES98S1600167.
Veinte Estudios Artísticos de Concierto para Violín Con Acompañamiento de un Segundo Violín: 2º Cuaderno: III. Estudio de Doble Cuerda Interrumpida
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8151e74433ed572be992a3ecac147e068f1815d4d3ca8a0d5a81b6061b46e101. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ES98S1600168.
Veinte Estudios Artísticos de Concierto para Violín Con Acompañamiento de un Segundo Violín: 2º Cuaderno: VI. Estudio de Trinos y de Notas de Adorno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4dad7f9e1e722f50d280700a34728040e88a476633378d7d18afafc9b8a7bc. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES98S1600171.