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 0xe17c63c9bac1b686d96bc733d1c5e375be2495b2a424f37baf7b182a7252ded1. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac4ae2f2-aafe-4c46-baa9-9cdb4c188eef.json and https://artists.proofprofile.net/proofs/artist/ac4ae2f2-aafe-4c46-baa9-9cdb4c188eef.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 0x3f03b707453260936c28fa0c7d48759902413368308a6dcee21a9f55ed0cc35b. 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/QZWFF2495639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42e53e239f750bc86b1268fd9f6bea9df0e0f3de9ce9f078e335693e0626ac0. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZWFG2403110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a946613e635387938df3690abb77f3c67dd319b59394ceabfc16ceecf74642. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6G2575761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a5c61d6c04fbb33e482e012dc1baa49df97c5ad91c759f5c19f53cd15f2f6f. 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/QZK6F2589862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe428426c50f864c98460d869bfc4ce31d10c98e08af35f7aaa09c23018c3277e. 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/QZK6F2589863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a946613e635387938df3690abb77f3c67dd319b59394ceabfc16ceecf74642. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6G2575761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3735068ab6ecbdfa53d954538f71b0b07e2df0b0215f1893f99d85ef21cbe02. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZK6F2589864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe99c71b1c2afd8ab9060bae48dffa49e3a802041a48620381defbf61e09e27f. 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/QZK6F2589865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ea868116d958f6d91b816d3128806a414800d4397ebe16890cb5a7b9694c6b. 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/QZK6F2589866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ed83cce651f0e6eaa97c688ad3dc030e861ab6f7c08def534c41a6ef54e0bf. 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/QZK6F2589867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415b7771203e1e3f15fb0597138c2ed473e1889130ebe552a9fa1a5fa523db05. 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/QZK6F2589868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f13c49495e911f7c813338ccb2e8f648637bf26f813c7dcf98ad7151fdcfcfc. 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/QZZ7P2552392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d26237005f399292687583248e9e2939a7ab3768a8102d5398a61965ced2527. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7P2552393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff374893b762f686e3bbd737a386331f6f2b8c3511f986b028007baa8a6bb1f1. 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/QZZ7P2552394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaaa72ab47e2b9dd928105b46301ea6c606113dd5f0de805c17cf7769c0c9e6. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZZ7P2552395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd660fdf60e7ae2ffc7fe5ca113b1336855e3f71a195424dcdf0b2dcbfa74917a. 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/QT3F62529961.