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 0xb48eaa221efbeb2d8b42621314a9f80e6ae093502bc5c669d6616a1382b1fb55. 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/d1698613-a03f-4bdc-9fb7-6bbccf4e3c4f.json and https://artists.proofprofile.net/proofs/artist/d1698613-a03f-4bdc-9fb7-6bbccf4e3c4f.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 0x0c99ae6b5e2e8769df93edb44368eab70e6e116d65fba639dda6d323dd9420c6. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZTAS2291094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03cc8803a4559da47690071f689353a76de54e739d1c0630fc076bea870fbf0. 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/QZTAS2291095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cf7732fd5a21941b19a07de7391c6ab867b5b235699025fbe375c8668009a3. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/QZTB62213016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ebc857e768943ac76b0220179fe03ab813c3309716321bfe814a465cd1eb4a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USLD91757343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afadab6c790f85f874858fbdc15f59b06990dcc6e7e11e66f5ca24206c27ead. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/USLD91757344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa1cbeb894657c7b9c00409a0e0419b5648f17b2fbddfe8032fcde0cd15c5fd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USLD91768517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf271aed0cd079a8c652ba8b64acb8d9c6ce792237565942e9f1e8f74a649a684. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/USLD91768518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e111331168bf7c9334d1f8ad2533a548f6fc45cc656519bf5e7c7cdc6114477. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLD91768520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e270fd7d7616488bcbc9bd1cf40fecd70bec09c256093c484b5ab4bd12befd9. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USLD91768521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2f99b906d1a64f16e444435f552daec9964687cf52fd19041bec69cad1d0e8. 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/USLD91768523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac994202d945ee6fe3cc7c3186a22f8620b7fca54aa057a69a7378bb709b77a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USLD91768524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cf6833efa2b2ab651b75772f010cebbec2bc46f2bd5c7427f0d41fc609fe22. 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/USLD91768525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90af472f379193d49dcfa363016b5497f7436b400a6b9bb9b8c76a35877c7bdd. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USLD91768526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecb429a8a6a6733e14c6759acba08b788cdc9c7d7d0f3c8a7fcac25543e3b44. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USLD91768528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb987d465e4a8dcf211e7e26a938a102d3debaff491c021715205e3c93b7dc298. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/CA5KR2517290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a8d02bf016d66f622394a4ecbd6456b3600103e511febb394c919ca9b1f232. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFZ42537389.