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 0x38bc7e9ba2a135d0e98311715f22a190490cbcc93d2df95817417cb976f22b82. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dab081bf-f27b-49b4-8c29-20147461c678.json and https://artists.proofprofile.net/proofs/artist/dab081bf-f27b-49b4-8c29-20147461c678.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 0x06ff7145e55e238b948d3863652422160470c3211c0e7100e403a6cc04c60d96. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAHZ2463922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6271573fa23ad0588cec343e38b16b2247841185b0d695a94cbadf27b0582d9c. 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/TCAHZ2463930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6054ac0b2cdb294245f7f16abec8066372393d83a87b084cac915a2d1d400e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAHZ2463945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26e5d4ae7b2b9a6e0ed86f1bce8c561e1d6a867a8a688edd89c7860b74d3fda. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/TCAIK2449193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c66d3d5e1ab19ea353bd1271fdb77732fd19bdfbdb933d380f55088aae9fbd6. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAII2449198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b29d6fe4ac146f7d0f1bf8f841cfbfe833e3d96827d677cabcc070b360e86f5. 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/TCAII2449211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac3c83f63866de838fdfdd495e572a4bf48a023155d1f54ed3c5588136295ea. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAII2449214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ba71d015f21b04618e25da275bf4abfba3a3f578afa12c8d5a86df28058015. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZTB82419617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2075d4682af011f8e14c905334c17e7ea7289d0e0e7173708c6bf5a63f3df497. 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/QZTB82419618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607500f5dfbde0b235aafc30b883681d593b8b165c83bab8c1853ff8482342f6. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTB82419619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40afc788b944356b74964c2e23258e8b743c9e97903ea0b6e3421fa0b6a532fd. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZTB82419623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c720f830696d593f657f29b11be209ac42d1d8bb8e87deebb54632018ebf24. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZTB82419624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf364ff2b24cdced94fc243f9ec95b4e84eb3865bf8bfe4edd1b487ce95f2fa2f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTB82419628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a9a93f83903d5738232424e93728b7e87eaa936689a5beae5a319a5ea21705. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAJD2462726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80397d1a72ddb8b72e7495e4a52ef7c360bb4352280a1b1df7e5237ced2d36f2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTAX2593305.