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 0xe6c4fd1e2d97965cb643a7d08768e533ad8c5f1a9cf9d7a08034972a277209e6. 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/9fe2ff7e-dbac-4dd1-a62d-4830d27d6a12.json and https://artists.proofprofile.net/proofs/artist/9fe2ff7e-dbac-4dd1-a62d-4830d27d6a12.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 0x39edbce9baaaaa52062761343f1bda02a5e3d25ac7f3986d9f55f3b968041713. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTB52232501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f61a750ac9adaaefcd2de4049e4abc9cc6d04ba9ff29b5cb47b528bd319ac7f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTB52232754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5e0a3cb9670320cd7b0af71f42255a65b3915159d4afd7c7782f98fa060434. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZMEM2339671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacc824cd3c46cc34649a5cf930bd27c464055ead25c2fd98ac2e3e6d84ede19. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/USCGJ2417385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec1a1d67f407ecdbb6194220cd25de07394ca76feaeee9418369f8b2dbda554. Chain 2 (Bitcoin): anchored in block 957655 (2026-07-12T04:42:44Z), 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/USCGJ2417389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8148d0b1eddb3d417e52a1d457e72bf9616bfc1ff3acc769d1e43cae49618417. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGJ2417390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026950e74b3bee9d75864e726286f9ff3c23c2e9475517fd6b5e2ce237a60010. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGJ2417391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14220100ac9802b26df98d9371d529dd89cb5a40516cbb450c4d4f66a51a35a7. 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/USCGJ2417392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda64be0b1dbd69f2ca2f5ad3ee4469f61bc7ba2baa4a9ac60cca261a8330f5ef. 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/USCGJ2417393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7178fbc683d1f3702c49af93a42deb99882ac4198efe8874005df93170951f15. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/USCGJ2417394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9db150d1cefe718207e163927f89cbaf9d3df4b3d97893cd8cb055dd393ab7b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGJ2417395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29087ade8e4cad821bfed2bff5c915d20ae85a19514787864a8bbd0470523294. 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/USCGJ2417396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a579ea0846f64d8f04aa8f7bbbf6569aabd4094918e25dc3d310abfa5c24f5b. 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/USCGJ2417397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe593ccf9829fd05a1154193bbc1afa217de1ed1b70f6d1346f6efc17a3261fdd. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/USUYG1583487.