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 0x33f5d7ce1c794eb3585e168b7a0b6d857e94991d4e23557088822c29699ae2ed. 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/9a7a2fa7-6a26-4d7d-a314-6d33d7cb005e.json and https://artists.proofprofile.net/proofs/artist/9a7a2fa7-6a26-4d7d-a314-6d33d7cb005e.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 0x6c47f0a721066f75c4fbb032488415cdb8b2895a066c0236a1aef8b250a1c065. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB42571498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5319f9a93122662ba510bba8b15b310c258b8aaf67ea5cc9bb692ab4c5a30fe9. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB42573590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0079f22ad8078770d0e1ef17132254ccd8261da498ec5f0c10d678028eb3b814. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB42573600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ba8748a407fd60a525de858dc7f8ea33f35384910ec7c5acc227b7cca7ca92. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB42573599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec22c8dbaf7296a937dd8011e2e78249be31e7d5ace3965c0b54b857601d777. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB42573598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da4da095d7dad994988e0dfa301ddf3855eadfcc3216685f30f3be9a4f1b566. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB52597273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3797b89efe910b4ceaded376f54c8a6bdb3015e15ce98848740eb5df37a51b18. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZTB52597269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5070c0841649d909311040a547b71cb754cf3c65ef56da92069943dad9ea1f07. 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/QZTB52594843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b518b257b0097768cba6d0a47affe72e98f987a3a23b360238f6b97bd5e9613. 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/QZTB52597262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b2e0a0764c069f76daaea635ce27ebcdaf77db9f84837fa3ca3f663377a97d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB52597277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db769863e9a7391c9a1bd9d6ff47030330dc02f8e1574e810c464764496c69d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB62594103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe27eb8d41a2132228420b15bcd7e2782efefbc3056a71aaf29cd41ff6c10fa7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB62594104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9299dcd87f22ef0390262c3e5588c0e98311833044c33bd382d1be4d4389d5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB62592379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ac9d39ab84143d11ebadcc021bbec63e3ba5599623351090ebb5ce22c2a361. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB62594102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc778fef0826167240021a31a41435090b3a60b1cfbbc31197e8449e2ccff297. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTB62594105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc2ffa7f535a75a8ca8fbff9803064354d35ee931aace507fcf7079a781cf20. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB72526017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7d48598c0803f9eefe8937051621a5dfce4559241303a6ad8ae59fb2834e99. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZTB72512774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9047c0cc290e15f9dde2d85625db4ec3ec3f66b82a857c53abc2b92175684c4f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB72526013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c0a37a82ecfed442c8d63cf03937d5283f3527827ee4371864ab8d97b20bb1. 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/QZTB72526008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff34369f83496adacfbec0ce4becb2ccc7e5159dd39897ef1ebda4317d12e967. 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/QZTB72515488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc908472be56b6e9340525ecb5315db43d9fa7590cc9f1bf9400a337181875cab. 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/QZTB72524051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6382618b3792919c35d69492d23c7972a3184caf58239a469916a1ac7f5f88c2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB72512846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4454dd23680d0e5723e1e614b78737b4da610fef7db296ad999733502db206c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB72515483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc051fbbf5f7dabd5fcf1e8c4e4688c53c284df5ae51efd3e623d7234df5b9a9. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB82526805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7485b2513dcd501ed38f1b9df16e23516479efc39da541bdfdbe4762871f5262. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB82526802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cb426a42e02ddb43e84f8b23e5bcdeb51d9df097709683c065ba7a419514e7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB82525809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7db0d1fd68cc2b3d968f82ce29a48c66cfc58092748625bf19ed67ed5a6ceae. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZTB82526804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249a350d8c09bdd9af782dfd8db9ae335ab3c0cd2e0c0dea1f3693c6accdd89c. 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/QZTB82526806.