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 0x6327e30739def2a34b8933b01e51766851753b417f71ca764cf930fa97075409. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a483600a-8e5f-43fb-bedb-6ade080e1c20.json and https://artists.proofprofile.net/proofs/artist/a483600a-8e5f-43fb-bedb-6ade080e1c20.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 0x024bbc4fcd748bdb9b85607beea7aaaa1f431e11ed2ae0cfdb971a3f57d0d7dc. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNWW2587451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5288a0d3746b096ecc26d8c104ffa35ebf8eca5dbbe4204a0059907806dd8aca. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNWW2587452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d93f690c3d05c6ff16cd506e83ace3b8720820412d33dcbd6f8e80738d807f2. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWW2587453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad972e05760ec37cd45a5078b2cacf34738a0e9b84096d52bed6d9ffe81279c. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZNWW2587454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e8b697b14f49f578fa0e1ca214f223c97df693fd8cf1a8f813129280ed7449. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZNWW2587455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64acabbe90c580204e6cd2accb0382ea8dbed883dec58cead453cc2511ab2293. 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/QZNWW2587456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670fbc9a5f2f24dcf6c030cfd9ac4dfb31e9a09b1fc70eb26077aa49b77591b5. 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/QZNWW2587457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeab80695c17c3f6b9e76f4126a0cfc49a9a716f6ef766398ba9ca525705f490. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNWW2587458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c5eb14dc208d519f3a3c1fa4174ef04a7e33f38c0b8104fe7af57d48a248b4. 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/QZNWW2587459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e62ea7df70de0efca49ba0a2a6a4e1ecd081d055ae754964e3a30716ba58368. 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/QZNWW2587460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22bde01a151f211ba8fdeff1a38e3c03eaa9ff9985db903c34aefa967299b6d. 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/QZNWW2587461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfcd637c44e204be6253fa4478146644199ea122b4837a97a9ce43d086093bb. 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/QZNWW2587462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760aa890b6b938815192a5775c8ef88fa823f764feb1fcdc61364618f9ae0c03. 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/QZNWW2587463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3011c5d55eec3b5c3c2bd3dddebf3f17f6b781f9edc3a423c9a7a3baf9cc88. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZNWW2587465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17135f1ae0bc47f726642f74504fc922486b526ae63dbb88d2ee28256d65084. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWW2587467.