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 0x45e14f21983a422c15f92cfba140f0347e07509bce453fcc593f7598c9413b90. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc66b6c0-1a46-43aa-b099-de7a8ae7fecb.json and https://artists.proofprofile.net/proofs/artist/fc66b6c0-1a46-43aa-b099-de7a8ae7fecb.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 0xc66761572413cca9e2fc8acddeaefdd1d3affc504ca5c5e303216ad45253c926. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:29:03Z), 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/USP221300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9222c6291664da0530fad85c5bb77eae608329fdad99011a389c127745acc5. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:26:37Z), 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/DEZN82365734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c09542c77f320aa7689611e694f8b2404338e85afec7b8faaa728c0b39883b7. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/UKXN22476795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a59ca8228aa5f2907342b463ed2a85b710fdd29324d2e2a6d0075f5a30110e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKXN22476796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717004e6db32bfe806c967e784cdb48657fd55216605e3bc740bdcd9623d03f7. 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/UKXN22476824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646fb1a4619b42504e6366416ab4d4ceba6c31a8a6182e6b1709becd037c4c00. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:07:30Z), 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/UKXN22476825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bb38e3a06b6935a7abb1b66b31af434ba41b7c978ed6c1eec8abf8cc42df5c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:36:41Z), 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/UKXN22478375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37e9cdd8d3df21e841f7c5a502c00b10efcd084d8fe9b1f3b26afb4835d71db. 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/UKXN22478376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168f157bedc58b7f39b250f8bc54f6b0a2c5bd8c53090854236b92a8da4e696c. 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/UKXN22476844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f83b334fc66500331f3c33f59d125426d98be272e9d05e211cafd576d4a248. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/UKXN22476845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec101466860684686ac081dc01dd88b99e709040e82b92ad852a78312550e29. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:06:58Z), 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/UKXN22486700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1df434a64ef62aceee148c075c08623703f2271ff6002cd26725657f6a43f64. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:23:36Z), 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/UKXN22486701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc71af68b4bbab0dd307792264ca16e8cef48edb7138bd08c6de1e68853227f. 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/DEZN82369425.