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 0xd587fbd204d66e8dd68ff90ed795dc83a76140cd0311ede17bf40e3d64570178. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0c15857-a3d9-47a7-80df-ceb7ae6fc9d0.json and https://artists.proofprofile.net/proofs/artist/c0c15857-a3d9-47a7-80df-ceb7ae6fc9d0.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 0x32ddee960ae8f5b03def7d9a5a940d4ff1fdfbbe484370284da7f45dea179cdc. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZWFP2578368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3fa899433e97c4ee092228326bc0c983d29f2d8b93ab62a69ffa775d7656c5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFP2578369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1f67dc84f708f43b3e3036d31566ddb371fbceb34809ea17c4788049f7cf05. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFP2578370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380b852ef4bea17a5037c17585e942d3064b78ebef431eba05c89338990cff80. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFP2578371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac23d37ba4ff30cfcb102d5c67e55cb59616a3ce5f5d73bda7710c92e148a57d. 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/QZWFP2578372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e593936cd6cf0f6164220ee51403f130d9234605b0a89d43d12c7421d2ddb66. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFP2578373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50680c4601525416977eb40ecd6a4e0512b36bd7daed8b708edc56920b881d89. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZWFP2578374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4482a54c0f330b2157bcb62e45ca00f1f810729dc951e8a617a5757147c67ed6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFP2578375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c54ff2db90e45039eb5906a57d0399b6c9017309f656879c4f09fff115e498e. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFP2578376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7636a776b0b25622b5e947cb33eba16b5fb87b829642bdc9f4763ef45771777a. 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/QZWFP2578377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f461dbccecfea2a88f29d7fc8b25850b4a53984f61c36685b052c08213e995. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFP2578378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34105139e1f26c104b76b31ceb162d29d91f0cae39dbf95f65cd5889c057cb3f. 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/QZWFP2578379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff918e85e26c57fb509627ef2808bd3b2f496240b07b8261c89c84da9a70119. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFP2578380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2765645edd90a3e6f23319537b93fcebf3d262e31d1b430fee3fa4a000b8653. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFP2578381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451a8c19f126448ad27267b867c0fde8aaa48ea912a0541122ac2b97994fac32. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFP2578382.