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 0xd35091d3eec5f9e785a31fdb2c547bf69d101054dfba3cfdc8cba2098a592de1. 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/436cc058-8dee-46e7-9413-15c54b541492.json and https://artists.proofprofile.net/proofs/artist/436cc058-8dee-46e7-9413-15c54b541492.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 0x670dd72f13a05fb77ad8a89285dce84b4d180500cc440b4a2d32f0ba37b62195. 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/QZTAZ2351757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627aad43b90de0fc7044de0b56b2a0888ee312582834e7f943f28ce9118343fc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTB82365418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4158fa590e9a5407b593a06d647c59b93b7e82b6d00f776cf451d66e93b5ff8a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZFZ32475569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0b09afac7617bc24f9ec4b28f21dfbf0cb880a63db2052ea002f71c9323af7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWX2414142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9193bba9cdae1c56f7c59ae2318deb88103a26878e74bb9c6b8bd882b5b2a1f1. 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/QZTAU2459283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9932693ed9c42842f3cdb771c99b41d542405dd684df64e77bdef30b4619bcb. 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/QZZ7U2416953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef48b2d87182cae89d7af38ba42d4c73492264ac1d528c772447bd7893c46752. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZFYY2586139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193aa969b341baa7f0e30e9d24aa8a85b68860f85dade6b7460d8555f64bdba3. 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/QZFYY2586140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9193bba9cdae1c56f7c59ae2318deb88103a26878e74bb9c6b8bd882b5b2a1f1. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTAU2459283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8925cfd49d415dcdd59e2d58427b4b1d0f292fc9d90a75964cc4e7cd92454821. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYY2586142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc1882bd14a82757192d14090a018625a4774b0daa16ce6758769543da87a40. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYY2586144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162fe99e1ec92476741a666ce67c4e7cc884a3eb3803da7c1118930d96fb97b7. 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/QZFYY2586145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3edbe18e859dbd1f2d941722601c686d3ff473dc0651f430ab6bf1d8c673d27. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZFYY2586146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d75790d55a08b99d063c4fa96fd206848c927683aa359a2e63475ec0e4e4bd. 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/QZFYY2586147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112ff042ce42500ff409316fd5ff76ba1d83b7ca2fb34b94b5a25a8b43483c6d. 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/QZWFH2534781.