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 0x6fecfeb6a1b8846eecc89b9fb00310f69da295f8b4d0803d384254c4e6c274fd. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ac27582-1f5a-4e9d-ba45-ac36d194f210.json and https://artists.proofprofile.net/proofs/artist/3ac27582-1f5a-4e9d-ba45-ac36d194f210.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Clavelito No Le da el Santo - Guaracha
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 0xe4d57f9cdc2a7a0cbf4e608cb1a419e46aebfb2f5bd5a76e20e3d1515bf4cc4b. 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/QMFMF1386093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5656797845b1ca2b07f65b7b1ceb18e75141ba28f666f78a488789fff4ddbc8. 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/QMFMF1386101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031e1a878c9f73349dbc66b973cbecc9d144dff753d91d99991c1bc7dc7ebfa6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMFME1333721.
Las Mulatas del Cha Cha Chá - Cha Cha Chá
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde21226219672ae3d6f4ab5b8af4da322ab66b8cfad5843d2672338e529ec038. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QMDA71301066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b0bde876c6e73f3bfdf554113d743b89ad858ad7970a24040a7906aabed572. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US6R21396120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380659dcd240d7b75d14c7fcd2a35c633f2b7725c2bb9330cbc8b31e7416db36. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US6R21396124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf3f55bc4a28cd277f327e079fa415497782c84968ba850c97f348fb497a510. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/US6R21396133.
50 Hits de la Vieja Radio Cubana Vol. 11
Best Of Discos Fidel, Vol. 2 - Tesoros Musicales Desde Cuba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0c37a34cd8d154aed37d7b4f15af00cb7e795b46184e68b82afe8ee0a23c6f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6MZ1414706.
The Music of Cuba / Boleros & Sones / Recordings 1948 - 1950, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb478dcd9048ac9adcfc7e179b083e9a520c8e2e9a845040b21404bbdcaa590. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GRHR11009802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dd357690b5651d077d980273c92976089e066af99f708004cab2cd0bc1b50b. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ES5531006786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7069f24104757484440593508611bd2475ea127560cd22fdeb17f5ef7a940506. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES5531227497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845790f21323c6c92c0f7d92550b5259f2e7bd5d66032a035aeef7778887463e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USSVU1100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b2d890adb0787292bbeb15d93f346b738c3bf5340189ba8a7db103bb8244e8. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USSVU1100007.
San Francisco Conservatory Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf744f6daa973e322ed341fcd0ca82334449154d5ccf8960ee5eebb0c91c63b36. 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/USSVU1100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ef611c475b2506d9b3d518e3f794bb81c463f62e69d9e623467b3b77969ff5. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/BGA261846114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a80257a92eb10956ce18acc53f4bd18521a2ccbdfdcfaf47ff5fad0da39217. 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/BGA261846118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c9d322a579fd564e8cf7a28377317174ecab21bcef59aca2f7fea9da4fd970. 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/QM4TW1578660.
Best Of Discos Fidel, Vol. 1 - Tesoros Musicales Desde Cuba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a208acf11140b08218191187704fb9e655afa647cfb800fa49065e485dd9811. 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/QMBZ91557203.
Trilogía Sonera: Chappotín, Luis Santí y Severino Ramos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1411e27d3d45c62a87766ce63720dee4eb941619af96d99b735aff8e32d83626. 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/USV351371080.
Perlas Cubanas: "Chappottin y Sus Estrellas"
Una Noche en New York: Arsenio Rodríguez y Conjunto Casino