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 0xebe775c0c445878664fcd76e126ced0db088295fa5e1fcda7a6b9e2434660414. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c4cc719-6ae3-4b42-a3c8-aa6c12b90415.json and https://artists.proofprofile.net/proofs/artist/7c4cc719-6ae3-4b42-a3c8-aa6c12b90415.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 0x8b7ce5ad28736bd3ef75645c791b77731b1158504f06a6a231bdf0f49280ff58. 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/QMV7H1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab1866558308410fadf228e89f42ea88b6a3c428eb09004090f0fc2ca7a1840. 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/QMV7H1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9083350965e53fc4ef670108fec940a6c22f9d543ca96c298f0cfd042c09e05d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QMV7H1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552bf5fb5062631f5fc204a8f55c61d0d5fb8d7a1addb33030ab3efb06fae3df. 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/QMV7H1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6d897b9f5cf4bcdc37ce19d42d7a180b94253754970b183466a4bdce8522a9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMV7H1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240b53fa5913031b5faff88ba81984681ebc38027a382f65bfb039030b72942a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMV7H1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8957533d6b51f82420f9fbac518669350203cff7e6b2eb5a5a2c3a280fd9df7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QMV7H1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c8e6de9467e44a4f076d859b93109657b6c472cae216e4c94238ea02a16fba. 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/QMV7H1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190328b1af56c227e87f31a8385c6489159d4ec8a17663b8eede56c1a3ceb48a. 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/QMV7H1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a8461e7c9678546486ab14838025728ff3f05f90c7721c15e10bb641ffbd1b. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QM4TW2032503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5d70a3d3eaaf8c106be3acaf1d17f28152b963c3b04d0e8a6b254cb8bc16aa. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USLZJ2107395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67a6501888ad0ee5d299a23ba90d76c7f5074b9fd5b15f2d931acd111bd1265. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAFU2189983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8ad710921f2d8c68b33406189c04deba47fc02bec520cab76a3886e8cd938c. 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/USHM91774198.