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 0x9b6003faf3c9b1ee68fcd67a9bc854265d994c61e2ae9b9f7ac6c2f3859c8a21. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14239275-2987-4924-b1a6-061e5dbb42ee.json and https://artists.proofprofile.net/proofs/artist/14239275-2987-4924-b1a6-061e5dbb42ee.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 0xa4ab8ac9c3d5d72d24ee98598e8a9a3c467a858f3cccf8f9b5c9509151ab9dfb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBSZM1500316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf58bab2cbf9e01b1c16bb9e151e77755ba40c93e8b0fff4352c390388088af. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBSZM1700472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd644a7c554f145c71aa6edafc8d4e201eda084c59db3c04bddbe58e8e08c01c3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBSZM1700476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcde83f71d0a77d2895cc756d81768d6a9c008f9668ceeddffea31cef3a2a54. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBESM1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b4f4d5809eac344c08e5b9f547446e21592b0b065613e4bc6c2b60a9b83b1e. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/GBSZM2200692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d86e06728ce00da78c9b52b7d71507906deee90b4fd1a8ee65a80033fd82f6c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US25X2202652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917cad6ba41fea130be69340810a6afd493851cfcd525ec2a02f302a99667d9c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/US25X2202651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877e07a833298e39964702a95c8c2a891e38e29e472e41a27ecdd66b6e6d452d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBQGW2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9389cd3df5fcf1f54fbaf315295282e524b3f2305a1a265ab781f39a95cfd1. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/GBSZM2400786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b41669972608043bf1c92442b1bc29bebfe976dac84050351ac1f34b283a3c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBSZM2400787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80120594b061d26094b6f7bff6e6d4fcf63df0c05d9145b63e114d4b25c3624b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US25X2400587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282ed3bbd0b7a4e362c8c7c8a51e1eb75e24cbf6a2cb4a8ffcddfbb09156b841. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/US25X2400588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3df7797c608fefc7514114d4ede4a9d75b7b4d520c3fcaa637f5e7ac58d4f1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US25X2400590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98f8c78d684a2476c06704b2833a6254e4491db171bdaa7bf2be614e12e9c48. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKEWB1600082.