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 0x5d53c2a448347d7a40ead96e89ae070137faf44b9f56e9d71fec9e4df4906178. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f65417d1-d9f7-4156-99f0-3597dda5be3b.json and https://artists.proofprofile.net/proofs/artist/f65417d1-d9f7-4156-99f0-3597dda5be3b.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 0xb2482164dcec43d487c20f4f13436dfd1d6969c7bcd687be98ff9fb08e6adb36. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZMHP2330035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6362ba5dd51b2ca8a06eed2fbe46debdb12884b8491bf9d4a37413627cf70c. 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/QZMEN2482563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a996da19ae615d81373c2bee2dde5d3ad72a0bb33b3555de8b39c44e7fd24c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZPLR2451993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9cbf30f39d61e14f1ca0a847a5c8c6afa89041e14dbbe09c1a2f140db36a3e. 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/QZPLS2498277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea37220b20ae256ae6b2c31dee5467776d0de0bf7da1ee36d7236feda229be7. 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/QZPLS2498278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0866957b5a8aaf27b99ec730471d56e4cd24788eb564570c5bc850a71e1101. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZPLS2498279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00a6ba6a522b8b1525a3ed9007f759dfff856f24738b63a898c2ce077538741. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFP2481841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be684d852590d88c31c54dfc5ccf21fe9412bbd82a0096be1cc8ba30038b3a0. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZHN42587146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163a8828eed097169e343aadc10dccd3f1aa9f5cc233de62b578e09dee84c56d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZK6N2577585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ad4fb34321c2089487e04b68abd93b36010b750d2b2fa3dd9d44deeb1c3a2a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWU2558179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8aa2b0552e0ef3d1717cae2b70d98dc3fac3fc0018dfc106a632eed12a79db1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR9W12528187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721f99a63a28ba46bee6278f4abee8af5893bde10bf90f668f6c241e1b2b9f3e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTBA2545540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49678d30f04b3cc51c46ea0c1beb8bd3f6ffad9eea9f2c8f59011aa8fae97af5. 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/QZWFU2572077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b367382005fa71247e3407a4bdbb2a6037a85daa27654c2b602dcd1c8d44e2e. 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/QT3F52543885.