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 0x2d8d5bcfb2a8acedb7af33eb1f058468a514290e8ca0eca41437faa6e4942c66. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8efe5fad-4cee-44e4-99a7-3339cf2fc092.json and https://artists.proofprofile.net/proofs/artist/8efe5fad-4cee-44e4-99a7-3339cf2fc092.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 0xbcf7cb5225b66af51b05899df98ef839aee584b3a68885835eeb98502d123656. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QMGR32166370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf7cb5225b66af51b05899df98ef839aee584b3a68885835eeb98502d123656. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QMGR32166370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538d8f28759ae137c5917c574a5d7ad11536002aca824f171fb92004e7593594. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMGR32112369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5489c4058b40003a1436bc94d820f3d3132bc669de7674ab3fb090e1bf32cc. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QMGR32278479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc161ee299f8c0546ea042b5ffbea4b6ea66d94abc5988355bd5655cf6c3bb421. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZQAY2181614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ac35cffa41ea0dc41a793597941884d8887a9546f69f76efd1e7a89dbd238e. 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/QZQAY2183256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b12427ee294e8988cfbf07563d47e7fe18c741d0087a3481e5435d5301b786b. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZS7J2105696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b12427ee294e8988cfbf07563d47e7fe18c741d0087a3481e5435d5301b786b. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZS7J2105696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c710797a65f65274d1a215ad9427b15ec756b962f6792b9572be816697634b. 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/QZSYP2186513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dcabed0057e369a7e04d63cdfb2a124cc203d502169e1768ac06cd4472cdd3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZS7J2203942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f0546daa47cdcf0cb2c9ad9d8cbafbc18146c145719ad538af0beb9b4b319a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTLA2329557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5cc14c176bc547cd2d62db06c28436955284d6a1d3fdb5747e782c481ab728. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZS7J2397475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5cc14c176bc547cd2d62db06c28436955284d6a1d3fdb5747e782c481ab728. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZS7J2397475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682f1f0116c6e052d50f849251e51fa50fe55970b37cefbf446653f839e5d8f6. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZS7J2367447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d10d846d06fecb7b33879d666a8eeeebbaf031e412b5b0b36b79b58b635b7db. 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/QZQAY2406789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff55f7d0c37badda039d192f7ae4e997e2f3d9fa5d98fb41f6d6947832cebb1. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZSYP2424893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cafcb9af353dfa05eb5a185afbe71544fa330a940b471e44d370ae94aea7c28. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USCGH2363487.