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 0xfaec74d6376fa8d37bbb6c845ef68c37d5ac9c4d1cf81b81a94778bf42ecfb0e. 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/e98d3ae1-ee3a-47d9-b88a-4eece4856216.json and https://artists.proofprofile.net/proofs/artist/e98d3ae1-ee3a-47d9-b88a-4eece4856216.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 0x50aea14b7dbb47f5126ddbeb5abc97d0abad7fa87dbfc7e92aa913d6c9e4ed3b. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/CH5171100735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08859385b931c29925986c734d8c874366a001c43e08aeda8456d2fbcda9c00f. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/CH5171100748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4e73a1f6d06232474b7560e938b97f1fdf1111229523e1f8402128a8d6e010. 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/CH6540849472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5287fb8d3ff64a4bc0318f62c94cc2f72bb0735200df6bb13d721b8a95d588e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CH6540849473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e53da6629e4ff9b2b4bc7e93323f955e8ad2f7fedb60e1d4a08fc70f416cfd. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CH6540849485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348fdb0e14212b04e346d8fd0133cf48c168b29d1518077911e6d77ee665a827. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/CHD661800050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa299e914175cbf61ce5a1417707e7b5dec0b4ad4ccc1a1b6eb84142366560588. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CHD661800057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef3964935dcbe7ba2b70d4770d5e6a0be9fa7d769fdeec3ac67836867dc85a4. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/CHD661800059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4add812d6641cdc3be305fabfa8f937f201cbbc26051a72e074ac4114bc1764c. 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/CHD661800064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24c50a03cde7c888b8490fe3744c798273c18ec200733604a412304eb976d6f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH7812410161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25931d357332cbe353b47f1bcae4a6d03506c3ba5848e77d7cc65398fb4159e9. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/CH7812410162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fb0a4c8f6e05fa32a111556e39cad18a29f01b408162ee4db837513091e0b3. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/CH7812410163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1fbde71a7d7b51d962ea7625cc883d8cac08cb97b7a9326b13b2c0098f82d8. 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/CH7812410164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b728a1882e328e87174b2fd81f2a7ac663327f18a27f563b044bb414bcb837. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CH7812410165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5336d257bc8b28b418926e12e7b6e1b784741e8e0c435d347678364756c4d2. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/CH7812410166.