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 0xba866d99fb1c9e47538cfafa530383c8967e82f02f6dd231d5a2575a1811dc04. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9283a762-469c-4eb5-bdfb-425cde885104.json and https://artists.proofprofile.net/proofs/artist/9283a762-469c-4eb5-bdfb-425cde885104.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 0x3e224ba3ff95fff6f3e6cf250d1f0acb56a29f11357a101b2a9a21660efad1f0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHN71955774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf4e45d64071073920d8ec3cb06fd27885cf744bb1921f6a95c626e8edc3775. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ762434895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6f8fb62fc12bd778dc7d5aed5c7ae471eda3f9268b4ab9fae5e5ab2cad97e2. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZWFM2332686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319525e9252f39d38827fa8b8b3fdd4ffb3f148a31783ee48cea51ea92b5355a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZK6N2458410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29ef44555a8fbb2e5f1850aa8d1725d9af9fbe5dbc0179fa2f6307fe7c3c0a2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6N2458411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a5ca34087a05c0e356e9abda6ada7359665ca175eae2d7650833512a2eb22f. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZDA52248520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad266ea3a32a37b63f3aa8af0f650e9005eda7111ca5ad8eb94d8cf4d1f2b7fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA82471947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf38ac5dc4dce545b7fbb81a74315440e2b4e988f993db919ddc63f6e7bfd77b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZK6N2458412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f9f7c6c348b18634d479a7db1d15c8e06584e17c56617b83c968713b7ff7db. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6N2458413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04040fa1cd345b1570e81627a096dec6666507079867a7e8fa48d015dc0e50d8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6N2458414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57477048df9d3f17b51c24e7d50ea3d930d72b82686f6caa3ac2ac6b36f3210e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6P2462147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb896bdfd3d82993439c78a64a4f6bf212cb6be29ae3638f92388272013e53c7d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ22186437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbd5a613a42c6138435e62ffdc8d0f95fcbe366aa55009c103bc4a9d90b5321. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N2458415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4201e345ad7acf6b108a3514b44cc9d1dcff8d194275ef9aa820bd6de4e53d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKPL1978335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0bfc543b14d7aee6b713c9fd35d8ad87194197aab4292fc54407e001805fe0. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/GBKPL2008896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc35ba3312ade04b01baad04202f365f1f9426c14589a3615fa724bdd0134c68. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBKPL2141831.