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 0xfa435ddb182ebff144962e94844d2a853d3be04234c6b8b9cad38530cadbb655. 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/068e122e-e0b4-4a81-92d5-d4ba748c53fb.json and https://artists.proofprofile.net/proofs/artist/068e122e-e0b4-4a81-92d5-d4ba748c53fb.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 0x7852f8f77b33f4314b5f34225b362d4c5c28f75f378d1f076117c12cb720bc02. 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/QZZ8A2346419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7852f8f77b33f4314b5f34225b362d4c5c28f75f378d1f076117c12cb720bc02. 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/QZZ8A2346419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357779490f90cea2fdeeebf0d70278f8313767a7eeadea488878cbb829d18caa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTRX2467024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e3684db45ec2b2093de1ab3db99cae99719582f795d079d2f735ff9a572d57. 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/QZWDE2434974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf4dea18a40c7716e709d542760aa1f5e3413be88c4761e93f749d821118e43. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZZEB2450227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6a5bb5b36cee73f077acb95b90c2ab40ea9b9c260a86c1ae7e88adc9e88d3b. 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/QZZEB2450233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc1de5a54d77c001794de1637210202e2b2d03fe7e96e7a123ea74964fea340. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZZEB2450239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01ca7ae6d78762f81c49c59c83706f1947a66ad61290335ecd9c775e250ad8e. 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/QZZEB2450244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae2b0ca928ec6e9a371a12d6b19d051b21e29e9a1fbee5a1372d67e44dc5859. 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/QZZEB2450249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aaf58f0bccd7863410933b6dee518195b9f92dde8cf566ebf32de11793c5175. 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/QZZEB2450253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2039c3c6d57986da1f3723bffaf9463b114e85d3526accd5e57d5a7c624618. 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/QZZEB2450257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11160cd56c1422756de0ef96348f5c165a0d850e79ed7877939e04d987c856af. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZZEB2450262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6a5bb5b36cee73f077acb95b90c2ab40ea9b9c260a86c1ae7e88adc9e88d3b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZZEB2450233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e905e02fdc314705dac67ba93c369d9db37761e96466b3b44ae3643257ae73. 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/QZWV32444386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a48c5ce62ae9f7b75d0cfcd8a936ecb39f6752d801b42ffcc56c817776a7eff. 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/QZWDE2407638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd480b92431d929ad413c84b466cb7c054858398208f43bc28587c33db3bb68ec. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZTV32435293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413b62e073b33d949f37f366db839d5b1c7e49d0170008254a82aab881b66715. 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/BXLMW2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e905e02fdc314705dac67ba93c369d9db37761e96466b3b44ae3643257ae73. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZWV32444386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413b62e073b33d949f37f366db839d5b1c7e49d0170008254a82aab881b66715. 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/BXLMW2400011.