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 0xeb4ca30357149a5f8ecee80912b8dc43b19a1ab5b2397f36b86ec31682b591c5. 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/304098af-2ace-4c25-b7dd-2f83f5283913.json and https://artists.proofprofile.net/proofs/artist/304098af-2ace-4c25-b7dd-2f83f5283913.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 0xd896df422b1f10de170adf86a7a9069275be7a4e2dd6be46b11e4641428eb743. 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/QZNWS2072843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500d247c77daefc824b03a2a59aa39e8558ec99d9f3596ff638125024c97775b. 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/QZNWS2072835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407cbc17d1d1b34da34c3ad0830e511b97e9b3a449815d1e870b84cdaa75c2ee. 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/QZNWS2072836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ccbfc0330f0bd6ef2985e81232097ccbbeb487540852c314002a782ed79903. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWS2072837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fc31325051dc972bd0b62bbbff736f4c37c6425dcdcdf85dd85e712e3cf665. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWS2072838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c269482340cd8d2ec75cbafa70be2c92c4dba37ecc76645e3a17423905e2bf0. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZDA62293905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5e1f005ea9d441a80d649a181c3c21364ab743fb79a4bb3ae5c0d9f3657ebb. 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/QZKDK2258071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f3fee2f35441d303467cfb22dedfba50f400df0945ef74968217c939457503. 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/QZK6H2236439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfdca772235263b917f083f2d780bd83927033ce93a6ba4d31200f93209359e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6H2280744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67f1287c8fbcab0a3f55b34aa3b3c3a102a7bed29c7ca765858889c9bf04b5c. Chain 2 (Bitcoin): anchored in block 957552 (2026-07-11T10:04:42Z), 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/QZTB92214651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0817ad261a09580a3a4810fc5b62eaaed6c1c6c071d78ab6d7e92bb72c0d74a. 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/QZHN52375864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4a7cee5fd1933896617cefb2b291a231c0def7203083779a6a8414e4789057. 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/QZHN72343353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ffec93b02fb07ed172457bcc0831f01e3a98986e7a3d0fbcdbb368e8e210e4. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWX2337617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881b1889bf4a9efcc2b0fb6d4b546b6bf1d9788f299bfc4cc86b607682f71bda. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZFZ42437155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffca7af0234a70bc7864aeba0127521345378d7ae804d25de198dbdb7da15f6. 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/QZHN62471014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ea0b0f62873184f0c4d3a06b2db29a9dee95538fd8d42cdceb4780144ea769. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZK6J2478180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bb2a91005e732e42ffdfd9002935c97d68058d644e8f6bf32d2d4305de0b02. 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/QZTBB2463765.