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 0x247c0af528cf955dcc14060579e8f59be6c751dcfd6d513638317f3b4c988a21. 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/807a389e-aa67-45a2-a0f8-ced615805703.json and https://artists.proofprofile.net/proofs/artist/807a389e-aa67-45a2-a0f8-ced615805703.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 0x56f1384fe5d0c9dea11cfb14703cb2d8653664c745ea9b9c6d79fe03d3f23888. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZPLS2225030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f87416dee434c184194039fb583b95ca5586616b93d948892ca0386bfab8e14. 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/BXVR02112285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8595556c091d7a761de2348a3805d8d9c31eaa7c0a7af9eafe6b37b02016f898. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/BXY5K2146351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ed5097429ae005b2a1d3bb301b416bf5d0ce4248ac508f8739cb843f7bf398. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/BXY5K2145082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2e4317cbabc0c6e3f83cb1d868e37b1591d57a4b063280b7598acdda78b82f. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/BXY5K2145081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072b97510ed3aacd409e361e2925ba39949fd59d92bc0ae63a9ecfd33c695c82. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZRP42296046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1408eaf87da02a8b3940379dc7495911302c79a56354a0c67a81f40757dfd5. 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/QZNWT2340663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c636d4e969c419b7fb9ee2cc6d15a12c8e1df04c54b4f0e292cf2ff6ad442eb. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/LBA0H2007610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8296b9cd1c403e8930fde88d7880003db7d3d08716086316b9c51184e3b2f5a4. 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/LBA0H2009552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161c7a8a330b112d63d5ebc8869fb0080a84cc044ce445b8d27a19da93ef4599. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/LBA0H2011398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21288e9f1404f7284d63f30a759750922a4f4d978e6c89e2c23aea1f99a5f5f9. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/LBA0H2011526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7117baa846e3a230d8eb09a1a68a2a2d7b572be0abc8c793dc151635a50a63. 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/LBA0H2011527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb549015bad70e537a4ed1ae636d7d51e9a9beb4a0b1bd7d72813051a1d42c14d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/LBA0H2011529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82932c6a6f8c8d7174005d82e2adce3fbb612e1c0236628ce4cc6d04786f9126. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/LBA0H2011530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b07e24c38bdd9b130fe13555c716d3cec667644a83f7b062c38e15c2da21c12. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/LBA0H2011531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161c7a8a330b112d63d5ebc8869fb0080a84cc044ce445b8d27a19da93ef4599. 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/LBA0H2011398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc9371d0fa871ff2a43459778ed120e1cbeef9b9dc9d8cc80111fad4ef4b2d2. 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/LBA0H2011532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a174f11567059c89902c2f09e7bf72359794a2253371aad21457846f1bd0062. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/LBA0H2011535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4536b78592e7f6b624867fc07a6897ff4b44d9f277a3d207724b633f59b28037. 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/LBA0H2011537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322c1447e4a28b1018f660d11b62c0f7cc11c6e4095f23542cfe0e433786e04e. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/LBA0H2011538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1bd4ea5c94583f9fa605783f6e1340a4dd9d9b51423f9b66934eb42330f08ed. 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/QZES92408099.