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 0xdb1ea8049acf96f2fdef26ed6792af8f5bd31b6f057ec71d0b7a282ec895b4f6. 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/f49e0164-63b3-47e0-a63b-9d88e9abd51b.json and https://artists.proofprofile.net/proofs/artist/f49e0164-63b3-47e0-a63b-9d88e9abd51b.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 0x3a1d2c03be03586e57054b240a1499a7bea6a583fcf507d901fbcba9696e0e03. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFYX2145597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2117288c549543f7e1b39e5d3e64c3b15edad7cbdd511f2767e7a8c72909a83. 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/QZDA42138832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862adf7c055119625272c6e5f9a61816bdfd0089168d2106d9b23ca30e4affa6. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHNB2150442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c2edd34fc7de170f71c7d9b1028f254ccf5c3e09d16ac514c80d4147937b54. 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/QZHN62101582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a81e911fb0b5533e84edf4d20632f76a0450b63becd8a2420bd6ac7bb65035. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZMEN2183617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493e7b9ba19f9cde02e7e9a41da51dfa6b9de5476d9d43161ddcefba196488df. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZNWW2150652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901ca5a29f2cf1a2dd8dee7afae5713454220d8c83b323338166cc560f161b3b. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZWFN2333684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014f1caeb3dda34372e28df7dbfdfe316289342989866716c1ae37d051f0fd33. 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/QZZ7T2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47620d8835350d7e689779e74c4e81f0af90ba9a412b71bd8b137bead8e184ac. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZZ7S2497489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf918c7463f821ba5c0e6bcbb02efec6978e64293d1de971b233022777128a551. 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/QZZ7T2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dec18812d63de91e1f2580e1d78c7b83393b5b3ca510865ac855fb018515cfe. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7T2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38719d10c104796115420c29177f5ba9389a9075c79fd1121bede7851dc094df. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZZ7T2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38719d10c104796115420c29177f5ba9389a9075c79fd1121bede7851dc094df. 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/QZZ7T2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110be4768ece67ccf6816f864108b95a0b9bb5b63ba26562fa3f06cdad65ebc4. 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/QZZ7T2437681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f4745da4fa967e25efe3535eaeee6d608e4246a8d854b2db51aea4921da44d. 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/QZDA72128037.