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 0x9b5c91f5d162eb0a7d61e22aa77b52282d94dba6a53a9fc5bd6f4bb863f68630. 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/13aa9bc4-fdf8-4ad6-933e-84ceb9981f78.json and https://artists.proofprofile.net/proofs/artist/13aa9bc4-fdf8-4ad6-933e-84ceb9981f78.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 0x3203a8bd5a779d6265fd77e7ac16b837a4df747c6b6d65792d53ff188973cb4f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2584187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa15b8be43b569c9d93163925d55f5283275dbccf7893ac66836c15fa1985315. 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/QZTVM2478325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6a192555bf3aed9538041e5f7390241b15d8ad10579d33aa276a61a722d16c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHZ62283789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc01c02fcc0d5dc298a7adc699adfeeec2c86c75a917ec2f9cbb1205c9932ff. 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/QZGLM2312305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e0248f3af4a812d29ef21eb3a7be51c1eb80e73751b307bbe453d909432f37. 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/QZGLM2312306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844e6bc22a7a45e36e884eab65573079244b5d6a53b01ae7d0ae349624165b3e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTVM2279614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ce00ea4276e25ebe2e517bbf0ea603af28ff365fcb1b2e5f50c6d234e5cfca. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJX2259519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef458b95e4e9491a0fd13a1b2de77b4c4e3a2d5bc3617695d29668fc37c596e6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US7VG2341262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef458b95e4e9491a0fd13a1b2de77b4c4e3a2d5bc3617695d29668fc37c596e6. 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/US7VG2341262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844e6bc22a7a45e36e884eab65573079244b5d6a53b01ae7d0ae349624165b3e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTVM2279614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ce00ea4276e25ebe2e517bbf0ea603af28ff365fcb1b2e5f50c6d234e5cfca. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2259519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6a192555bf3aed9538041e5f7390241b15d8ad10579d33aa276a61a722d16c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHZ62283789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb42305e975a68a89eea109aa2896b089b5c6d198565c855f8cbd54f055c15ca. 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/QZGLM2237099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef05b213a061fbbc48ca9dff45fff5584c563b19b3e8d516c29012d8ba2bba8f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2165180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6858c34693bfa4000a5643cc8bd55f4dc90f1911efcf56a4029c7887385befd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHZ62141521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9276da766b45a3415a70e9d869ab26adfe5e91f6ed4a9f83710d793b770232. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS2157062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411949d6c78c4fe071d261fbd7cc2eaf57db4e180379e850a4cc4b5f0ec93dc3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG2143735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb70f76a47c406e12c1581ce2e937a6bf79f28a2826aef45427e87542e613b4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMZ92547044.