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 0x861d814b07234e7046ce977200923120d72a147c88c8279b0f718425d69cbe75. 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/c75ecac1-74e1-47a2-8130-67ba6e33dfba.json and https://artists.proofprofile.net/proofs/artist/c75ecac1-74e1-47a2-8130-67ba6e33dfba.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 0x5d97a13949a85e1f02181904ff493a80104f8e28fbf8ce5fd0d45b5b47752f38. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QM6N22355747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b6e557ad0f3a34e545110baaf360a2e4d68c8ff0a2089174720b6e1ba8a6ce. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBDLM2200319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39e04381ce1f9f51897b372652ddf35f5b4a83e54aab3175417f99d9d3073ea. 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/CA5KR2339103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986aa5b7ebea11643267bf154bf288c4ba9c80313d43e1d2173119f471aeb1a0. 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/GBKQU2411099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805b51fb3d424f6db03c16773b583f133a3d552a290c2167bb52e994ece279e6. 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/NLRD52319323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6512497883e0efce123e71107b61d0175b13ac4a3f4adc5497b2c3c132da992f. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/AUXN21923579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f04cfe2914bd5ed08e43d8ec8f49dde228f1ae08a9ecc63e6edfb72ad26c62c. 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/USUYG1414614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42b112cb0919d8aad6e5f9ac463a2a7dd8a42b125aa9f58c3be8db2cc8b34a7. 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/QZK6H2400581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d97a13949a85e1f02181904ff493a80104f8e28fbf8ce5fd0d45b5b47752f38. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QM6N22355747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53993e786bbad258c487b2acf16235b5cdaa0f0456a08d6cae82be485f05f6dd. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLRD52257476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53993e786bbad258c487b2acf16235b5cdaa0f0456a08d6cae82be485f05f6dd. 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/NLRD52257476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eaafeef4b437b88afa16cf6ec8e20b7d6a2679a30f2c3497fd04741278405d1. 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/QM24S2100231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fee4beb5be8784c43b06c1be7fc65ff5ba0711658e0c20c137c95215680ceb6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2400396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3d4ef87705a45ea62506ebb8c4a73b3da29a8af9d08f80fb25315ae330775d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2115489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f04cfe2914bd5ed08e43d8ec8f49dde228f1ae08a9ecc63e6edfb72ad26c62c. 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/USUYG1414614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725825faa39845b4b3460fa025f7f7fc4534d1877351373921ac5eefd59d3165. 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/QM24S2301076.