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 0x39b9bb32911b5020fa0941ad7e523fde799208e325b345ea17da56eaf49f6098. 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/8d505a48-58b9-40fd-9bd8-30ef200c355c.json and https://artists.proofprofile.net/proofs/artist/8d505a48-58b9-40fd-9bd8-30ef200c355c.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 0x9bfe3d6629f2cb40ae8df248acf025a44ad811c9df5b9c152aa3cca09f72dcb8. 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/QZ5FN2151074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3330936e1e0c3dfcefd3ce163f59e13850836085204c5f3535056fe3273b54. 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/QZ5FN2151082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593735a0d8e7761eb710b52e78ceecb05ab5506e38b081881a360840d3ce6d12. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2151083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc393af7ef11f1e59d8948e3ae636cef51eed554b139dccfdb8bc14efac40c375. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2151086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bb2bf39fd3dbc2c647c50828d8269ea779da5d36180d020f922e9544cc20ec. 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/QZ5FN2151087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6336152fad025f7fb04a3abcb0c5b022c742cdd9a9a9c53fb108f64095532b. 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/QZ5FN2151093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc4918029bfbd671f127a63ee0289bb40409f6ddf05dc8d9e2af999cfbca1be. 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/QZ5FN2151097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc667b9003315b07a041e11d572ee7d8e526221ffcbab03a11880120d45c857. 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/QZ5FN2151105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b03b548cf59dfbdfa2e6d95fb89ece463fc90c13f819522e5ccf495572e11. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2151107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cf350c78008d9922aa39b17d960d1744d8dcff2c6c141af2b27ed5eec8bd41. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2151109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144c85c67bd813f1974870dc2b3ebeda9db9de181a48510e091680527eda8586. 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/QZ5FN2151132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cccbebce9d27624e237c33bfc16c6e0d611570f1431f92b584e7116d4b12724. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5FN2151133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8888dd9a682d96b3c752e3174afb93b0c3a1f523bbd1a1d1e693c1fd9fa71c5d. 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/QZ5FN2151134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dfdf5abba79d02adf0e7544ca991db28c2ae06c2d3884792592001ac59e24d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2151136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce326698b66d3bece541ee0aff90c234a7fdd4d470338bd81d6d9d2774492bd0. 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/QZ5FN2151143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895b2461e016fa1559c746722f254da79cff258cdc3f65e40a4948bc8e7437ad. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2151146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5791b5aba8d215057905e377634ce5a4147c5f3d884fec6f05d8acc9c8abb28. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2217542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6037dda4bbbc87b3a51e417a7c7d3beee57d5993379ec725a0c1f6647dd4acce. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6P2168332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0d7b05be2a3c1596663d81162d019dfdb05c369e191106b9c4a3f5adfe7fcd. 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/QZES62123333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bfd75303b68971b3fb27760a6d6b1108a11020f10aef2d93161d8ae014172c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZPLR2005210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9b6ffe9ddb6eff239bcac81323ef8c3a8e847448244ad582702393a4be0ab7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZPLR2005207.