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 0x213bff5a18203fe0c9c76717144c92d0443d89b3d98e46613ab6e6f987df207d. 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/2d0fac3d-2bd1-4d26-9e50-c80a431d4fb6.json and https://artists.proofprofile.net/proofs/artist/2d0fac3d-2bd1-4d26-9e50-c80a431d4fb6.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 0x6098460e40420d5f49bb3c0732712832c8c4b62829f6454539484cb6d05a811e. 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/QZES52381711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e071cec882282a198a168c462ba6a83852332832439f511e1c724aa70083bc. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZTBE2468553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742ed1853521f80e10fd07a832ebed2539780d69427ae9e71b7f80aa49433b6a. 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/SE66N2397340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19e91997bbe58efc5f9a48e2c14b9432497280ef45fe744e1708df696dd56ec. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE6XX2310701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c15947a9202bb475637e2b4e54c0f78cdae8ecc6cc71f9206e234b0daf5ba2. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/SE6A92360625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb84881ae3ff614082cb1bef5281d505ef8fa567bf0f624f86b566cbc7a02bbe. 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/QZNWV2291876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eadaea1b55e0bd6b690c92539928c9b41c37de2327f5247628e91877d8a54e9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNWQ2141496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d194e209ef49c953cad7db6f92b23f2036c0d577b9156aa1df9bc22dcd0dfe1. 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/QZK6K2247229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abcdc92fcd64ff99bbed3ac5236294d6709ffd6e5b040d8736c75db3abb159f. 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/QZK6F2252671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940d031bbd2a232730cac919e8e63db66a5a6a660cf899c932cc7cb101d194b2. 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/QZFYZ2174596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541c23828544de6477883f6eb7a6aeb355452a47ace34a0529938efcbc7a27e6. 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/QZMEP2166679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc316aa5a2270643f0d416116996a03e8f0ff21b03d91b8325bd60b2fa5581a0. 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/QZHN32102816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1569fb9bfe3ef722ec29f04a96f8b06644732ffcd6d414333db167258a8497. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZMEP2166683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb7bd8617ef0053692ceee3454cfebc4866307ac2cdc2d807ee156d193aa9ea. 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/QZMEP2166684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5d5cfc3e36bd5a278a1cfdc5cc3a0234b7d85865171a3e8c30eac37b88a16e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6I32471808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fa59a401f810514076fc096f2fb051e3a2bb08a8d380892175de640ca09d2f. 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/QZK6G2417741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511bd3b05078193aa47b63adaf0c31a4f551510f8cdec8ac5193041c455bbad6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SE5BU2480332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85828f194cbb2b13ecc94b05cf0d54df28c99478590033625af4e2ea73fa705e. 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/QZHNA2302180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231c3f4f2182bd0d7fb7a99e76f16e6083f88599802a9e6d0d8b01dcd3af0bc9. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHNA2302888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642557909e637771ba49e8f3bf4810b67c79b2f813a55b91d510516e0b18b67f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZHN52305320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cbd2dded9216ee17b0241270ce9f0e6a64a9d9ab9d8231e9d62dd07922517f. 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/QZDA72397443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588536d455283708bd4ab994aeb08cc80241d37b1b1b997480fd28055177afa5. 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/SE5752377174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8b3e83f499000772bf7c3603c4ce0cf6c54999f876fccde73451dd20c9f2f0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SE5BU2359890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4db20ce002367fbcdebf75e0708b091216551206fd6ef362001cf981289298. 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/QZTAX2296059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0f672de70f64efe8a0698123f8ef90171249813a9644a272967ba53b6960b1. 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/QZPLR2249798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd072380ea7f0ada6824a87c2f94337c5b8996c275be7e1f22bdf3c79b5aa188f. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZNWZ2201209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb84881ae3ff614082cb1bef5281d505ef8fa567bf0f624f86b566cbc7a02bbe. 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/QZNWV2291876.