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 0x78c8068da20bd9f2ee192f1e696ae8d7df83b71fcd13a420b032c8afe4de23d4. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5eaa2a6-9e5c-42df-9da0-49a49e992ec1.json and https://artists.proofprofile.net/proofs/artist/b5eaa2a6-9e5c-42df-9da0-49a49e992ec1.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 0xa2d1c0bc80070ae47af800507cbb1d5da10949b208393a1f1870404544390a16. 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/US92N0500479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bce246a64cd2479de1595dcc94991cb6e9dacd89cc7a82eede54aaa3ecd9de5. 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/US92N0500480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799c6ea4b78eec0c6fa0718f83549fd81b8276e54b074096c77ca4ee1f0c3f23. 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/US92N0500481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48340eb98de630b651f73263e869de5393b468f1abfd3a23c602b969914e6b1d. 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/US92N0500482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0264f31f24e0c06280b4522bf6cadd35fe00f9d8e6d1adebda36f08f0014ce53. 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/US92N0500483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc880d29018580a8a35b511a60ba3d20f46cfbbfb4070304d1e0044af8520b049. 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/US92N0500484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba3d21f0910406f6264495a221d6f890d2f0a8c9fecd92724c8e7ddd748f23e. 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/US92N0500485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585c7b4afbd4778b0f7612322c76d6a63786d8733074f92537a96880d7165fa8. 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/US92N0500486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8b8b6022f0c175a194c7b0cb62dd3ca0721734ea49d67432ece006e876dfd1. 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/US92N0500487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed025b3e58ef8578f4af2730f3597269e160832e8a11d5a2270af3751e5d976. 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/QZQAY2480259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275468045207f5504810a9dfe9ba83eccc0e05374eb6b05b70de37a9c53128b2. 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/QZQAY2490749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a8e8584a4e654ed99b24a0de643b097fc3ea94ef494a2b992856dd386287b4. 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/QZQAY2409334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c56c0c732d059f97afab9ddb516e223bcf5607e6c78d1c461de3ca1e1449c4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZQAY2435146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b88ce9559b7cadc8083d3449258244f0dd404f43711892f1a019a05af568b9. 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/QZQAY2464641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86fe920f86d600105cbcbe0fa8b8ec8d5c3c071a334a915c841fca629c16c65. 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/QZQAY2476459.