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 0x78ce01298972cd855675875b0167993161458bc19a41a8f145d840238e02a0b7. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf6e0fdf-8733-47a9-a290-c79dbef549d4.json and https://artists.proofprofile.net/proofs/artist/bf6e0fdf-8733-47a9-a290-c79dbef549d4.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 0xac77f5000eae17fd290c64f8f7ca45f24bc402500340bed412428586ecc2f410. 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/US3DF2400462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6effff7ae8996ab345ca34bb169ec8022674a788a1bd4770a13f26074be77c4f. 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/US3DF2400908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5b1ce855618a3da1c2c5548fcea27510e810a11fddef6fed2b47f9de68e585. 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/QZFYZ2448175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67d62bfb99d02859b8fe9fcdaca1e96fe2b40d05715c4c9ebe308193eabbeb8. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZWFM2394624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e3e81068c5665f45e224796c23d2bc02767d90a71e2333be5fd60c21b80e31. 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/QZK6P2207593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f3681137b0e65b9e2b783731ce175841ecd61ddb3637effc1a3a04e1d8f183. 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/GX5MX2105485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32efb2e0b7a1cea162e4c8f7c4c212561f8c11d8494aaadda21bf61cd4bce639. 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/GX5MX2105486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f57abf02a6bfe17fd326ab84255701bb2bb765a1b4824fe84396ab2dcf569a. 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/GX5MX2105487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974529436a9e5096d49f5a18a58de3660e2f907e6d0cf82a15ecc45da329966d. 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/GX5MX2105488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edd3d8ff9ed02de88e440eae2322042721a5876383bbae575045aca4bb3be48. 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/GX5MX2105489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7ffe6b33b0052c204bff5cef45ee098b332c83e21cddfc54831b24ecd254a0. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZK6F2165580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2857a29a0abd4e1848782a04aa2792fde46b2be3bc45a901b3ec6407c463f902. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZMEM2159140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9de309f646b10e409516e11ac5d1894b0e01476cb32393f288ad06eda415da. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZK6G2150050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a2bb81c2ff776a39dce987674ae79b3d095dcf9a39f434014681a433b5fd79. 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/QZK6K2187026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22371fd368593213228f9ed282acff6e9ba37dc7cc588d69f054c36a1fd0fe5. 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/QZK6M2143195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6aa684de4e458b2b6589686e037f2da6026230079d1096b1c2daf45fb06af94. 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/QZK6N2125600.