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 0x607c9c3f4d94d510a971d8d9e6bf7a461273710f928b08650e10a874aa166f96. 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/c5152cb2-ec4d-447e-836e-1fe0d7f908db.json and https://artists.proofprofile.net/proofs/artist/c5152cb2-ec4d-447e-836e-1fe0d7f908db.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 0xcc4f1e6b6ce583fa03a7a597b7aac434614c2d474b153ed173f506068c51fd0d. 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/TWA539900147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f495fd55bc6761a658a980c9747f99524c70f55d2cb649e74741ff2381640ef. 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/TWA539428406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b92c574f660217ff86512da0ffc13664e8cb98b942b54de4e2821ac4c76ffc. 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/TWA539900160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd46b1b28245ee6746104bfd240db821dbc5ef9e87502bbdf7d38880930326e. 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/TWA539900162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a9ca240d5f62c26fca747abeade2e8331e96734dc7c7be714d9d60806ba351. 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/TWA539900152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b8f77cd33d05f25aaedc0513f5377a20a85150156314484cc13dff1e479f49. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TWA539900153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9a05419a19b0472443d0968c9cb564c6408cd2fb50484b98d03512e3771f19. 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/TWA539900154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca5c769e5b3ab617c4f07ddfa37d3dc00611fe273f0565a55bedcc0c3d17e29. 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/TWA539671404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928033f73fd7c94d53e6bc6e62f2e8c3168da1db094068b5705cb861eb1092a0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TWA539671407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1271129813896daa822acf6f6233c702f660d1564b8104c7a2e22e504a6bb0c6. 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/TWA539900157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b95cc60efa7d855393c25f44555cc5e49b66a40a8f4be7834c99a700374efb2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:29:57Z), 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/TWA539900148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71a88db2ee4129d6e9533f8bfad8babad946cd1505244b82c725a62b8030b81. 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/TWA539900163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e9e3dbb9144b5ea13a3c31371313824ba08dcda1a2fe00659059cc0c8d35fb. 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/TWA539900150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62962ad1d0c847f1fc2a417efadb63c63b6b99f3e845db4d201f8fcc3f6f9b6d. 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/TWA539541709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe769b5122c85852a179a2f37f0ee4e08b0c7635875736a6ca7fb0befc7981535. 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/TWI252100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85584247fc435ca5102eea52647ca5efb1fbee5e184553a3334b76a2bb5bcdb. 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/TWCC32416349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a0dcfddbe65a7d4e5fc9c190eb13449fb9e4b49c210da34a0ca21d6c9f0fe6. 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/TWCC32416350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e90572a6083a05ba03df4730d0312d955f2e5f84f25f751b2719148091eae1. 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/TWCC32416353.