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 0x07c91311f078619ba25c09ab77ca39225d8492256b60c4c866eb84326a444c90. 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/5e1d3bf0-cd16-4b0c-99a4-ef4a81a60cf1.json and https://artists.proofprofile.net/proofs/artist/5e1d3bf0-cd16-4b0c-99a4-ef4a81a60cf1.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 0x20cf5c7d90f23368f7e41db92fbbc6f75edb2ce5867b04ec230bea6589fab800. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZES71820630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94578d0884da8dd6c1d9e30d0ed2094b4b677cec2ee8eb73dd4bba22ab0dee6. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZES71820631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766acda3bd0575400d970e7b448e987791d5f50849b04a6eb10d3991a468ac72. 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/QZDA62087880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83315c9e9b7b3c2f43c6f5c85c36fcdbd828a65cda2c6b92733ccea1db8aef4d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA41984535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4db7edf3c6754972857072c045c77d883280bde212a1df5056e59b981a673e0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA62087881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d62c99e1bd1acab5add3aba382486777680301b02356b5c1241af1aaea74d28. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZDA62087882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5756e0b3d8b85967acfd3686aa04ecc3f8271a2f790937a9364604f7159d8f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZDA41984536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b29154870f047cb3cc39b1680b2f55fe8408a077b825554f08a96a82e2417ad. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZDA62087883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaab0142d25d600f62bc4d69807e94a3ce933ef6dc010247fcfa2075616a53f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA62087884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6bad4c8d99451da82ec19a0f52d622fa805322d0cb057209649c805de9552e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZDA62087885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f91905200d16914214819438c7d1d63a42f2645abc3d20674d7dc569ff6298. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZDA62087886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cee08d0dc0d9e8753bab16f071cc7c7b1fc748e2664aaa825e961e0f9fcc48. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZDA41984537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843061d4840770d74bf15721dec5464a34509d2c4927c042ddd4eddd60678d09. 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/QZDA41984538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b1a986dfdaa28ca47e0dc8877954497d91c316cf4adef0e0fc94dc1126b8df. 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/QT3F62584736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3b14e9e66125ee8cb9a31b0e33cd707986d456c984adf15fa584c086a44db0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT6EB2593811.