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 0x991902412038b16dbc3db9cbc117623d65aea571fcaa7a2e9eb80b508be35e02. 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/67d140b3-c56b-46b1-bc44-a83b307566a3.json and https://artists.proofprofile.net/proofs/artist/67d140b3-c56b-46b1-bc44-a83b307566a3.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 0x9511272853b64800dc3fab1e4b2a17f937fa8142cdc479250edd1173d63347ba. 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/QZK6G2014143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00623ec8e767f33480bc6ec27364d8022d47d93bce703515cf9f8137bad3146e. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNWX2063222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4007370bbaf99f77e80759b440501825f1a5b8d28c3b5aec3c2e50c081b5b63. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ52128154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa365a536a701140dcd7b859aaac6efb0c80a906d6d60fbea3f27cf36e339c47a. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZFZ52128155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531fa066d09df2586f5ed2601ae8388beaf0eabd693f1245f5fe914058f50e0e. 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/QZFZ52128156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa653981609872605dba4e7d5fece0355d4a9c3cebe216f5fc3a08c95819d3001. 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/QZFZ52128157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a86b91580201d21a5ded2ed6875468870f5d3346b77c7a7466168679167877. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZFZ52128158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ec0b39e22be8cc62250091063da88aeaf2336d85daa3afea009ae9969556c2. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZHN42181003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a30668dd3934708799d215be26eda866166536798f552e18ab40df9fc6b020. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZHN42181004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb55dcaeb194698b40f6521acd7a680a9ce573f33e2fc402dda51b8d2e2e93b. 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/QZHN42181005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbeddd09061c352a73eefd67d599b3bf97018ff078524dbe0e2dedb42cd7776. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN42181007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa417c7393ca612d0731ae446d9df2553e657e01a02593abdb1cf3a6046b50cf3. 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/FR9W12215029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b005ee671c2ac7357391be934338e8bb0dc630ad038c4b39e1664cc4e6c229. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR9W12240904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b8a462082b70c3a5e3b6026dc8406231097c94062eb7628bd3217764196029. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/FR9W12240905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e72cd5f73562fa6755e3d3172497a2fdfebd4c7ead59b70ff5b4f1dc130990. 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/FR9W12240919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0cd8ced936581211754913686cfedbc1b32f6edf6d7d2d873a3e2b257f0634. 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/FR1A92305438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0cd8ced936581211754913686cfedbc1b32f6edf6d7d2d873a3e2b257f0634. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR1A92305438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9339d0ce1c3a61d18f1d277a0b75ce6d6cf819171d0fe292684770a6e6bff782. 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/FR9W12234685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55096c8ac4baf0c5705e07fc11d589a52fc131f4f50d361b3424bd406b259a8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRIDO2314692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55096c8ac4baf0c5705e07fc11d589a52fc131f4f50d361b3424bd406b259a8. 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/FRIDO2314692.