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 0x4521ce71f3cb4801fa8ca3ebbd29f9f997ed9dc2210c9daa42e785466f8c9db2. 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/46ec97e8-1a4c-42ac-b7b2-659743a465cb.json and https://artists.proofprofile.net/proofs/artist/46ec97e8-1a4c-42ac-b7b2-659743a465cb.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 0xbb7be37637bd14cb27030c80d023dd3f47407c1c2c4d94627bb577830f7aac4b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FRX872049436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c4dd0a9610471a80be14cadbb412dc893754749c9f0e8f19a2c0288ed64676. 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/VNA0M1918069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24dd211f6c6fff21ca2a3357267acc140b2e26ae817cc533de4aaa41e7d12c1d. 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/QZN882245626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0ea4e9701fd114cb2ab1103ee05ad9e5118e3d832fca5fc7172b37048701a7. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QZN882251213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafff5c955572b981689bb233f98afc5ee969e6fad6423fcde9e034e3639defd1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWDW2216606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec3ab64692008d8d8ab1b9a7edc3649496a466aed2c85f690e599b93718b7b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/VNA0M1929346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f93915d4fbab4db1407bdb2e3cea3b3e70ab0ccdabcea7c478924c41144549. 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/VNA0M1930100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d6de020a03f0f759cee25b137e194a17aed36449f66af107304bd7202cf219. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/VNA0M1931627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440dd7e9692942ff073c36d7dff7fd9de18f3521a4a0fbe1629434cb6cc8d42f. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/VNA0M1929897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82900c059aab67c9d8626b322d034eb78bd77ef294003104a53755b97c2ade2b. 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/VNA0M1933003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5782e8083f86fe219d12d179bbca39882d8da65e1b06e195f3e9492d9629a48. 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/VNA0M1933963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cbdd2e768d5a8755bbcf6b7d17cd54cc93daf5ece0cdef102d60c1ed40f8d2. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/FRX202027782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340173bc397e9b5891348854af9fbab85f71d19f3cb0d18296dcdde10c0a1967. 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/FR10S2219807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb518a6b8a8ca4588096aa34b604f697d699d560e5f32b8e3f151d692164c233. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/VNA0M1939564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535ce680210752ba04a76570fb5ada42b4927951a769c6d7f980a4f1a09980fc. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/VNA0M1940120.