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 0x78e043e911cd2d433f0dcac9b8c32e6fb430b5fbd51fff411513bac64bc56dcd. 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/a205a1a2-84cb-43db-846d-4edeab0a1199.json and https://artists.proofprofile.net/proofs/artist/a205a1a2-84cb-43db-846d-4edeab0a1199.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 0x287ebfb2d33f6cb74540443c0c18bd06afc57807dcab33c6e5a9539a446cf436. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHN52022499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12be5794ad7c5acd1f3d4234d9a831114502d4b962fa4f746bcdcd6e63ee6ac2. 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/QZHN52022503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b90feaed65d84c2efd0daac0838d349ba407523a75d9985fc6ca4a18d4d4a4a. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/QZVEM2374726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943a4e5edcab4ac078ec42e809dbfff2d78046d39d5d71a6bbf11e56d87619cc. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:08:12Z), 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/QZVEM2343191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48e933eaa41287c84acf7b0b67f241066949bb4fe1ef6306705d52cbca92820. 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/QM24S2300283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960259bfa6c460ed900c894bec89d6da2b6d34b2ff1ed67ee19dcaf7962e6cb3. 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/QM24S2206770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6836b94f857460318f1871f5cfa26cdacc013a63adb3129e8b705fb8f1e76e. 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/QM24S2204308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacdcf19ebaa05be10623124f8080e7c3ba86d006df30b7251c0e4d35d0258ce. 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/QM24S2202884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab9a9077646877d70d90ce26fcaa98ee3790bfd0fda59cb155db1a1719e35b1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QM24S2202339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57ea9032dbeef4cab24e897221670d382638b35cc71f21c269759b04fed2f87. 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/QZES62243874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb16f91737fb11f3f5432227ecc1581446211992d2e03b06099a00dc082fa78. 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/QZFYX2206127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbed48cdb21ee9afe67149d52dbc8e0a68dc70d70a1ae4d758cc0861b40e2c70. 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/QZHN32123154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cb9f6f816b6df8845803bcc68181d53c2dc153d6e1fe9184147f7c30252cc3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZES82173004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa221d86d413cc9ea79d8a33257b0a0fae1a343675fd3a2031ab57cb7fadd511b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZDA42116157.