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 0x924d7c15124f03027a90164fe8852cd52ed959a2d65a2120cd87eeb844ce81e9. 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/473e4cf2-0a9a-4b3f-82f2-353133b08bd7.json and https://artists.proofprofile.net/proofs/artist/473e4cf2-0a9a-4b3f-82f2-353133b08bd7.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 0x812b0c847fe12e284d173a65a83874db4f51cc99dd5aade9f195fe302fc53e15. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QM7282301504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f12e46be56a9503743f6f72867a733c96561fda29b7ceed7f0394cbc01c32d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INSD11935666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cb0f71992bb67a4c0d2eb99680872de9d795d1d7503984ae29f1b8f6f6dbcc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INSD11904446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d33262e8e7b5d63bae9475a68b2ad5dd6cf4deed2be6c418a966391e836c7d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/INSD11936431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a96e2bb26b5c16e4b65697f8aed5f165ce782c1b3ffc080f6c4e3f47153486. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INSD11936390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66321fb0354743f4acb1719a879612a6a8c425179f58028066c26840c8d38aa1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INSD11905382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6359e1ce1c8d264804614f34b315e7830485dee7045dc2217d7d9dcece8957. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/INSD11904893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b14184606e51de8b47e99e8cbc59c0437198f63bbfd44a9cb0806fb11af3bfd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INSD11905383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d5d97ad236f4701ad3f1b230c768227bd42149e90aedf25adafac484b40be6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INSD11915142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5114a8069b99d40531e445edd476d9a5d16f3fb7b2805df10cb06557ada1e9. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/INSD11934991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c87b7a9264b5a605ce31c53db92260e40d474ce670d734bb415bee38d11c4f1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INSD11913935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414ec8ff8078c994b2af5a633921a15816f183d2fb1cb59093ff3d780b46e70f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/INSD11905568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1955bed6c24a695059d5ccbcf06d6dd12de18d1f599beadad01fdda34fd5e1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INSD11905384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db4e5710880f7451f46cc357c52808062285831aeada93dfab1d796bc496960. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INSD11912755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972eb37cb55ed2aa39f6e8be769f539dca1747d2bb39ead7c19b392c198d5bdf. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ING582404991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f74eb6987388cf9904edd4337bf0af9ba754d902c03a243137babe616c56b64. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2411826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6fd1ff7adbc91f4fa1bb49cd1e82819a3435557c3928fbca9257001f7eb5c8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR96X2241327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca76022e063bac807e0adf05aa80a62300b5e1e64501e684112ad1296438319a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR59R2283051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862e7b998cb15b49187c33164c2fcc050dd9f1af9e5f7530512c8dc786622cda. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/UKJ8H2106039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7782e4621e85c7b547cb7e0ab2c13ef4b45eff4bf3c45218ad31155e55043c14. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ING582000780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860317d83073e94736ab83d11ec9c6c494fc608b14e3c9fe3ffbd4d361300fac. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ING582000779.