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 0xacb7674b985aee299727038be52a84df5107bda5321fad66b57e257c67c469cd. 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/e5f1b83f-d5d8-43a8-a8f2-d729ae7f1be9.json and https://artists.proofprofile.net/proofs/artist/e5f1b83f-d5d8-43a8-a8f2-d729ae7f1be9.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 0x4e84fc5009d2c00a6ccf5dad51da68b2ca2c765bc3929c184d2a361d31d2e9e2. 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/QZWFH2301027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c3d4e98d21c0f075f4713819f98c0ebb9b0bad817f64405f6c2c00dc16f686. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZK6H2314409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d2ec2d7380b781fecf0fe3a314d5103b7f2be86c95f1ef01f33633337d55bc. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZWFN2343837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cf223c19f6aa7223483f3798ee288c69c21fb8bd3a95b608dbc4b1b02e22e9. 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/QZK6H2397914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b0efb6e028f08538e28041b9c48f667a692ecd05b3a10dfcc3390402a4ba98. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZPLR2350657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a91eb1c25494e20ed553213ef199bb0be19711bd43058612750599d1256a230. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZRP52321872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe804f0805be0976bf64c48e9ad5b11bf2c6170aca47f4b4672e4cba80f9726f5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZWFG2338839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bb02673450b931f5a19eb2a443adda8005dfa6c6e7387336ba08058de5481e. 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/QZHN32415688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa909de7aa10fcf734f57b93fcea298c300c27bca483c307f1b713b967a35eb80. 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/QZHN32470859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e92e3e9757d65066e4cf9ce56b74e4cec0548fb24ad8d5002e8b3196180db57. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFZ72316500.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ffe64ac49c52d656cb930443199e3985b92620d76f69b011886c85b2afeb02. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/AUBEC2472259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef30790019640af430f9340dff1e2fcdfafc688a3b2c70c470d4a2c03a1635bc. 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/GX53U2368097.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154c3cb970dad3b55bf85c642bd1dfdb57a0d8e35dd33a1795c09bf0bf636bb2. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GX53U2374585.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dfdcc700fd2a571e0a56c23cc553a81587871a500e87863b40a5e1d8ec9af9. 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/USCGH2562728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2593a8cd04185eb4aa8d751dfbb3187f07e5b1eb0163780787b76aaa5cd5984f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/AUBEC2512920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae41ada75f3749060e9161612170a997719608899c59425300581a8d9862220. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/AUBEC2514083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa601ad863c82d33304947145b1c9dabbc3345c5d6a0013d675045e7a5569d19f. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/AUBEC2517481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe545636f39970118d4257ba49474b6b472641d98ae5548046bd1d708eb5b1a75. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/AUBEC2518594.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b025f1ed18fbae3c89dbc1befe3f297f0165f4ad0ba10422618b833bfb525c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/AUBEC2593908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09079d8dbd30cb0e4365d673cb0dc3ef4d4de4b1fb92465645a47cf5ac0a8d6d. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/GX53U2606717.