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 0x6f433df7ae1a2bde59e07f69b3ca30419cbc31a1a1cf702191161665b0b46972. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2e110f2-5ec6-480d-b64e-0e9821417249.json and https://artists.proofprofile.net/proofs/artist/e2e110f2-5ec6-480d-b64e-0e9821417249.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 0x035bce34540a9c12bcd639aa009d2690d862519f14c5f667274ef6c12ecded13. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES52053636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d3952c0ee3d2d43b0a7a643a7b19c4a749b47a8a0065e0a98617cda34c6040. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USANG2170883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bfb31eb2fa284c44dc793ab096d3d59810bd9e2a4520f7594d696f7b141750. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USANG2181663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaadc4d377dfb6360e83b67186026ef968b93b5562fba7e65573d52c3dd69eaa. 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/USANG2276534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3320da49b0e5c963ed7775ec98dc72546bf47141dcb5bcf88c0baef81c628c36. 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/US3DF2415229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a300788219cfceddf2b3e67a88c42e32e29f55ba12acf757e141bfb4d1177bd. 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/US3DF2415230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc581a09c8c0709ecf38ecbe565979ec9b46ae297fbbb344576a4ff209a2ac401. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/US3DF2415232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a472d7a9c7c332e81e502a44b5e95c8e91639e45f1f5c14608bf84dd778b3a5. 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/US3DF2415511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe978ff5a2447ef0f48588fb30926cb7b5b56c62f50dd1977a0fc0964e745160f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/US3DF2415522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66c80fc2ae7890195d228d346031eeec5950e988b221a8976ee70e6c1867918. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USANG2424197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5600972d4e9ca446d33129566a07f6f80ff975eb511b23cf6bbde8e60d77aa0c. 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/USANG2456418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3054d1b3c8ca663e9e83521805605fdb28030a1d89d3808bb1f278c3bf16e12a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USANG2456436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26551f5b193b5330ade39884718c6e03ee5dbf9e0374c2a87e69ad54df392692. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/US3DF2532261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b2931cbda2e6c0c1ca1ee9be6f206732fb84290021dbdf496e3a7e56be453d. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/USANG2536233.