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 0x1183ed4355f9595e14c530fb4f1c0d35a5ba0d9eb25995d490d13b2d0df5aadc. 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/a2f355fc-2e42-4c8b-b6a9-58f69d5541af.json and https://artists.proofprofile.net/proofs/artist/a2f355fc-2e42-4c8b-b6a9-58f69d5541af.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 0x090fc21f6afdfa91eea3d12d7c603e335abb6329d0b6d6d69e256563cf13fcc4. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DEZC62493728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055e602972c9d89030cc9d6604236250c2d475b7733e62334fb7bff05eec11ee. 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/QZK6J2417371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f324868b27c3c656078fad7df12f075a0b6dccff083aa2932e8a72388533214. 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/QZK6J2417372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7dd57b8ad6effb76c6fcdd89b9b9b01c90805eda25e6be29f195212dc28d2a. 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/QZK6J2417373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab04bf57df311bc6049af7206ba57fc7e8fff9eb150aa6b8868baf278204f76. 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/QZK6J2417374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051a52cfce76e88a192cd1a44f6de2c1edb6b8a392f180cd7b33dcb13d97baa6. 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/QZK6J2417375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20883462c3369807d85f9131a3b480b14873485e83ce7a5b0a5ab236a496693b. 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/QZK6J2417376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61f174120019b18173f5c579a89b8839c0c0f812f40fad4735b801ca9a91cee. 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/QZK6J2417377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10fa42c0ec8f4065aae5e223756a4d88ce8552c7e3486c30a054b2731b489e3. 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/QZK6J2417378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb454ac975b0076fdf8e5ff8d3853c186c4f01808839e08802b6814f3c08a9e17. 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/QZK6J2417379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc42016fd4762adb920bd8bc5a3ef484438b082a21b5d6f2a152fdfdebeb5d81. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6J2417380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16050e5c7f724079c8fa0421144e5e3f63403f093eb3a706565ca6dd93188733. 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/QZK6M2382591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8379228e60b65fa952091ff0f861cc6ae825d29258dc6888c7254464da9e36a8. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZK6M2382592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4214f85a42c387db7c341ccecaa4a426e8fb5e3bdb14dfa31317257700e25525. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZK6M2382593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73d9ccd0d8c815c9ec56a36832aa14952ca11167e54635b7bf27662dca1437a. 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/QZK6M2382594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09d85265b0b6e11436de07ad3567c0417e4c310c659e9f75bcd7705577e4704. 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/QZK6M2382595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4504099ef46f3ec551f530bba61e2b8cafae29fc0a13c0a85e478f69185af0da. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZK6M2382596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f7c1c914007dac9454288c60466d2f3c7f70407a6c9bd170a6eeeb41b45593. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZK6M2382597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0764cda9e0afa370a058ee3f9769d7e778b98be5d91420da3a4deb5ab4c37cbf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZK6M2382598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797af2f31daccc29c5762e815a5beaf710909ae7692bec7c2e70f4604a12ac4a. 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/QZK6M2382599.