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 0x0e8183c9328582d18ee02c30a83094acb304fe1dd4e6290d0ec96cf77aaf6518. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5fd68820-1cc0-4b50-a829-bdfc1203286e.json and https://artists.proofprofile.net/proofs/artist/5fd68820-1cc0-4b50-a829-bdfc1203286e.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 0xad0150322c5891fe50020d9ef0770865ce4d91edff4060c0a89530dd166ea29e. 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/TCAJJ2544109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d866bb0456b984028584930daab3d6eb78dd98f258926c51c8673f0c6723efa. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAJJ2543346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdc7080401d155a7b0428fadb915ed623b03e5833829e3f5f96e0ecc0ebe639. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCAJJ2543358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f28f1c0ea46905525b38296ed7b778c1ad71dddd1a7022dbf40be70f1a8713. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAJJ2543365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe103f11b50fa1b1762afbfa821829275775e47a01ceacc952d87724d2178e4b8. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/TCAJJ2543377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd289a682ea9202c5e34d0a587ad8538b75b30f4d6ed5c3585a90a38bb92d54fe. 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/TCAJJ2543379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18b5c22c4e0964914a2bae46cca707f4abd5db58ecb5f80cc1fd50bc1bb048d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAJJ2543386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85aeb370b44b423d0683884c93b75b7e94d930635e18780eeba60d0681e9c98. 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/TCAJJ2543399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05252de104466f2efd646ffefb16f2270980cd59c4fda5db4ddb3ad522861aa. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJH2523348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98672401fea594faf98180b0dbd63f37e1d75f2a574f0b1e2ed59fab1cd3e764. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/TCAJH2559698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf779c66570903d79813e171d4b2aaad4bd773ebdf88624487441fd9033e36177. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAJI2559757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6ce58d34d2485498db2aba4d5eecf59e63a128e6576c946f34a81aa3505c75. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/TCAJK2576852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40bf6dee6624cd72a57d75cab20411579b7c9dab21f08354dc5f36218dea36e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAJL2576939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87432afd21e55043feeef56ba887f8bb461477eeff5e9d9ec4737a9129205530. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCAJK2577084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf94566658fba49d261df2f6b9ee6b173ad45261f22a3dc7a936983f29c32433. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCAJK2577330.