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 0xc1df1c1668ed2b85deae218a4da3b4e97f828e4d91991ec8a79e38490e6f31b7. 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/b62f3adc-dcbf-4fdf-805a-4266a27c5f5a.json and https://artists.proofprofile.net/proofs/artist/b62f3adc-dcbf-4fdf-805a-4266a27c5f5a.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 0x0609bef5880d4b400c7a66d4ef0cb871e046b071b49d0727210483e1676c42db. 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/DETU11600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0220362e177f232025f61b32988b59109e73a47745dce4d3a6499d042e0ddd5d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DETU11600032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8425ef62050c14b1bcd145b350e1f8a453ad74d3a5ef8ab286e25bb610a989bb. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/DETU11800055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7213025c809bec5b007dd3c4dc9e1505cea1a9784af4a7ea5f17663d9021dd43. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DETU11900061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4009b83e3c925392d9a7c0dc7725af87eee4d1aca0b2cf78751b817dc05c4c. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/DETU11900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bc0b4ee23cffb9dc487596500f9cd7ab26fc6676815d95228399227ac90053. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DETU11900072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6ec463fd7d6078b598f619ade358d700a72db8ffd949681c201e30dbafcaba. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DETU11900075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df0d9cbc8eead526a766746b507f15535c74bb281b26fb791fd28a001429620. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/DETU12100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c604673850975b746ca09f66727ea656e3e8b25ae36a0eb94301217f02880fd. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/SE6HN2258512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de4b319d15a17ac8c2eaca02c0530bbefed4b1b8b706c1dea707825f45ede2d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/SE62M2230052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0fd3b51c8078256074cd4c0342b98b51f61828350012b57cd30c332fac67c5. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/SE5BU2512397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6368d10f09a5f21dd75233d918a056e8dbd4ee22d452584d1ca4f8f950c981d9. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/SE5BU2573310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55bc584ee9b60103108aaf6e61dac017e82eb3f1aa4f803aca50f791fdcab76. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6XX2510159.