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 0x62062ad3b7f28fccb402ff864ea14f59b2651ccb69ceb3f86fd1fcf02544eb63. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b722959-64af-47f6-8c8d-bf1b4db5ef3f.json and https://artists.proofprofile.net/proofs/artist/5b722959-64af-47f6-8c8d-bf1b4db5ef3f.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 0x7d46cd121e5727607921d6eb29bbc5d30091345ff93d8f9a51cba4eeb7585c89. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ES5021601568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d75191be9ed6de2a73668e10f9d1a9a16c31e1a662db79c410316d3426bf1b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ES5021601569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528eb903256acb39e145bede2fab3ef19ee8f9dce017d1024bd9d42e89dd0f18. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/ES5021601570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1179c5294c9741d593b76e64e081bca1e960bf5cd95a4f6fe26e03da93dc1b. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ES5021601572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6215c0923a68036a7b986df78944171daa07aa583390685d3dd0f22a55cd9c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES5021601573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292cf8c5aa078efcede284265b2bf9ad150b11d11d884041ba6e0bd8100196cb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBBFT1300650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52056a35e32f908e8a81baea0632119cdb606cdaa6b0a58098abb9fc075523ee. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GBBFT1300651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd452f32f98491553aff2a7d0954a82eabbbe4a96eef0809da238c154f2798c94. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/GBBFT1300652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe28a30d4f6f3dcb61f1d6ec1cf15dbece60daac2ea435c9cbf9c07c281c9596. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBBFT1300653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b8f48a9acc3490c0238cd5da0ea8e36efb9c3f464bc57d5eba4196885ef26c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBBFT1300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41735cd889774378d90ee99a11d3a71b7474779f6bc2116183c1c32b217df271. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/GBBFT1300655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46160cc71af32eb6219db836440438e4131b9b14f8807e4e84028fbeba73f21f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GBBFT1300657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bb496907a2c491fa31c1e3cde7bb37f31c6615865137ae64e53eae591323e1. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/GBBFT1300658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26500cfd6aee1dcf5de43eeb023b7b7e1a406ce767b14536198cfdd55be90bfc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBBFT1300659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e75f76eba1dbef28950e09956391d2cc5583d08a3950cbb44315efd6d28e092. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBBFT1300661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab59e41f265b23cb8a2ecf4ae206911a7841d8a703cb337c7b372ce312d757e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBBFT1300662.