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 0x734a267a903f6e0817728c7f8ad737ca76dc77297a72d787fce90dcb828b1c6c. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b659f7c-601a-4c06-94d1-8ae2601d3ec6.json and https://artists.proofprofile.net/proofs/artist/9b659f7c-601a-4c06-94d1-8ae2601d3ec6.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 0x6e5d8332b923103a9ba47712062b4abe645492dd8b2e972385497fbf96e68150. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NZBJ12300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c1b33ef7d7a1ec1d55fb54c931c1e0434460ccc2e670af675f3a0c77a49f70. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NZBJ12200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3ca790b91e16934a7c34ad84699c4e3581b32aca4d5b0e2732743cf2499708. 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/NZBJ12300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f35d6b53dc4570543cefbd7cb463f99f451adca731abf6138e8f01133eecaf. 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/NZBJ12200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938dd0b7507d7389a142eb42b75fe0272462e10e92905854182d78915b100ba4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NZBJ12300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f35d6b53dc4570543cefbd7cb463f99f451adca731abf6138e8f01133eecaf. 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/NZBJ12200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c1b33ef7d7a1ec1d55fb54c931c1e0434460ccc2e670af675f3a0c77a49f70. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NZBJ12200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fcff409c8319113cd339a4df881e51a6fadc0cfa9feae063a7d27ad4739e64. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/AUXN21937783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55eed8a670799913147ea055dc0b65838581d4581016e8571d432998d928051e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/AUXN21937784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34cba5530e1b18da736c0a409593902ee2acdd486870b3421ff041ff22ceb83. 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/AUXN21937785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22dabb95d9d74e76ad7cb3c936c3f177b41b6de71728b6a06f535d9456ded72f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/AUXN21937786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dc25590ed4e0c4d3c63e78d5da3e75f143c850a2036266e780d55c0e80264e. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/AUXN21937787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc1b77b1ccc0319d06929f75ef4835036670c7bb4d838c6ee1f9ea14ba864c7. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/AUXN21937788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de8d38f46febd3c60f8c54b53ea921342e7e0b74dc61f9c06ee4f300d77ba74. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NZLP01600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4234c26b9d82b98f26c1b95ab03db03411a7c5f0a46e4a0d7053bf78e33833. 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/NZLP01600135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e57f7c3d8841d41aa4f7b4cf7377a51088987f93742d9c6b2808b8f49da9412. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NZLP01600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739c2fdc0b1be06a21d8d21f78e839c5633d6547cba72b7afaded4e3f3e0326d. 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/NZLP01600139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363e7f8170ff1e1770deeb7d5f4e813d3b2c920dec1e439fed18ec5bc904b798. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NZLP01600250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b619712c22d21761d1518f270f6fcdc0f8946f0118a44da01c402eb5f5a038d. 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/NZLP01600241.