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 0x52f2c27702382f3286c1e490c9559914a1c148742dcc44bba7710582f4384fb7. 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/9b83ff26-e41c-4fe8-af91-88b1f3a0e53d.json and https://artists.proofprofile.net/proofs/artist/9b83ff26-e41c-4fe8-af91-88b1f3a0e53d.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 0xa77dd1a3b454132401a7eb6b7ce91ed893d04b6181962061d795db4d929b25dc. 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/USANG2242326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e383d6aff82f144354749b906a78ea86e8fe227e46821fe58af0cda33bf7e2. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USANG2242327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1383b6640d0bcc1f7c07b3477eb89c802d6e0aa83dfa6c050eafe1573b5ca2. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USANG2242328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00344e61361f5b6e8ff12f369ade19fc24fdfd7e875e6079ea0821cab6317589. 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/USANG2242331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bd1e16bdae4c83d5d0f0059a2fbf88d40ade05e94762c40213df30eef22b5a. 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/USANG2242333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf118a03bd35ab93c8195f79ca0417ee846d0101111469645b272f5463f97011a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USANG2242334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5ecdb05a6b864672766cde84df5b155b7c5e5d125d65a5c85f6e35c2e0a3cc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USANG2242335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a51d5ce5299a9a91ebe4e88d4d50b35a5b3baaae56c3bdc86098b57a184756. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USANG2242336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b029913139c1f0d252554cf430129d641f6a4a824c550b0ec4542582f0e257. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/USANG2242337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c8f2ad823b3a6e079959bcf31675edea97dbedb5e8ad89c4c61d04eaaa9bb1. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DGA0Q2382999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1383b6640d0bcc1f7c07b3477eb89c802d6e0aa83dfa6c050eafe1573b5ca2. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USANG2242328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947dd33b7bc80cf92cf54798fcddaea24f8403091f11b883f998008d41ed6888. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEQ022272632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3d94c137a11aa6b5f27a0f6845584b89fe0e7be92a166ec3e0ae89d9634fd6. 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/DEQ022290302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4975e760823ad65172f91bb8a4cc4df204dbedac0fcc36bfa82edda3324af96. 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/DEQ022290148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fdd4784e260244626c0b17b99c7acfd2872740735314c7e737459de6a61903. 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/FRX872130065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9e9e79ad3adf2e826f46b1a283deb08b52e2dc8a60377bf5f335a6b14149e6. 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/DEZC62131826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130a71570840e2f11e2af843d162c296affdb770e507468bd6fe60cb55049d63. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZC62131827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f9dd8243811b3c701760838bc2301165eeeb42c048ad32e1e538327f090735. 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/DEZC62124489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58776c691e7a3a053cfe659fa13f411cc583f0fc56c0b80ec41931236d3d779. 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/DEZC62123760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1016cd041499d768d5f0438477e18e275160a5c6e0d5d082c0dc40052d553edf. 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/DGA062026220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97b1b79ce13a2a2b4a1908c19f0060e63e98ab5635d496c19086c044ca20842. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR26V2018502.