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 0x38532ef82586be29b36b7b266093789969f71f540186f93446a3c24dfb04f3d4. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/453e2b70-24f8-4b14-9d87-494ec1c4a85e.json and https://artists.proofprofile.net/proofs/artist/453e2b70-24f8-4b14-9d87-494ec1c4a85e.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 0x6053d9d507d2fab72cc218b0f6fe439f50c35cbb6b38e38ad76da539e9b45c06. 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/ES6081640708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37c9ef29d90bdb613afb6b359a95d6c9d3715612e5990a73e21e5a748eb869b. 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/QM6P41921780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70709a4a32ba1e13fba8487efcd58bdcddcd71e19ba5f2c531091cc5a1f878d7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME1925021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e3c56a251c1682e11b39eda9744f6edf5f507f1385f7e810e944d83e54a387. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QMBZ91954520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37c9ef29d90bdb613afb6b359a95d6c9d3715612e5990a73e21e5a748eb869b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QM6P41921780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c69c603879a778f091bb3354011bcb47e87e6ab4aecde8ddefe827c507b2205. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QMFME1925038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e17c11e9e1e81de3bdd76ce9ec63106bd03f13bd1af5ad3338ed0c3280178dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME1925040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078106b439a4df39db72649b90b2833d0f3d226dad15c12f6982a53f8e66a90b. 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/QMFME1925059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8a178735398c6e0d14950f2e73aa6362a483ddd2bb59c1243a365d5375e199. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFME1925088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06dcbc1dba220adccd1272963c98803a58829ebc79b1c24f8f50f64ec1eaa22. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMFME1925109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9375fc923df4033c83305a102c31e2b5b84937adccf2b833ad0456c24da1aaea. 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/QMFME1924978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e49bc69326b31303a1d198711229ccd1f0aa1626311d487c9c6a7a6f361c784. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ESA012121977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9070702e8a754959103f4cc49d1aa83efe4e41d5a48fda68f58480f17ff491. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA012042755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b0f010beda4dcf706824faa1c4d776a23d0b8198b5646a747e71f57b686fae. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ESA012042757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ccc84feef399b40b5cc5874b5d92b588d7461d6cbb70bb9767288b2a657abd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ESA012042754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363de02a2cd65566f99ac362bf30512aa0ece05f9bb92e006b66e22acfe77f0f. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ESA012042760.