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 0xa6df36d7e24a3448f8fe049fc8def86b735368d8467bd5388c3a5fd5c912e7fb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef755506-3989-452e-9780-7639cc4abb41.json and https://artists.proofprofile.net/proofs/artist/ef755506-3989-452e-9780-7639cc4abb41.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 0x5903e06bf2fadf3c888bf8bdde1bd5567678d87387bfdeccfa646aad38a15755. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZNWZ2008791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc63b5560a88ceb53386216e63215ea8b9fadd2ae08c3c61efee86a4d7e607f. 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/UKXN22433791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437b8c37feb274fbefb3021c7b0ffda68b795737b71e5b14d630cad5f0b75f9c. 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/QZW9K2338430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d518e165511bc7eec8d0529a718981584ceb7c4c3e975ed00f3c30b67e8bc0. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/UKXN22439242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d0005280acba82af8011f685f51335ce8852cfb2cda8232410a18ec04b603d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKXN22463342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c78162a9436be112600c4b1008d4ace4bc63c8efbfc9a52ee2ef4e81e781a56. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBMA22494042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aba79a83c1d64ce1c3c522999b244d4635c058de1ef8ec62a68ca188bc1c994. 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/GBMA22354258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8815acf9acf304157ba4ad9e95d7a7861a8918d69109fd363de020242953e4. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GX53U2320770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0eedbe868e3aee11f17f8636b16c86455302b9b0c23cf27bdf2bec2b0e2f047. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/GX53U2329095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5b54422ae298529877c8b871361abf0e36e647fc9731846b5b0ee904cfd8fd. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/GX53U2329096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbd67e9e2b63f221bd6bfdb426021ceac96b28ccfbe9e82c4140a621f71a657. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GX53U2329097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf26e569bf65ee709d5b466a9e0d60e26e9655b8aad5b3dec565a544622fd48f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX53U2329098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ba9a4144412604cb1175c6bb5b8074af9540fe590fa121653d7d1f3376ab1a. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/GX53U2329099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29937321685099ef10d17389714551529fae735316378aaab9107b67e682fe74. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GX53U2329103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc043cfc6f91c4acec0dbab21ee59acb8c487a9a46222f9b8d7dfcb50cdde5820. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/GX53U2329104.