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 0x82d4f85d3b8a51ae8bba9a38adae6891aefad742275c0a76022c58db5fbc9ae5. 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/78276e7c-1de2-44f7-97f6-8a22c9b0ddde.json and https://artists.proofprofile.net/proofs/artist/78276e7c-1de2-44f7-97f6-8a22c9b0ddde.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 0xf9806bc31932ee690c957c5ad2b6f8fad534724ffe64a77917c6f51a95f3fa0e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES8591200366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057a2bc92b7973107336afc962f1643e8bbd123cf972e41c01c940248a498c7f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES8591200382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393f419dff6e5ac8778c3d1c2f73d9e407a614ce1961a565c41e45cbc77276ff. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES8591200383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4802b7b507a955680ece1fcfafa219519c3bb23f86c191343bb117db503a7b3b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES8591200389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57df7fe408f7908a4ca737d1e932e04e9cc4f2b5143bea2e6bcb76f45ad43ba0. 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/ES8591200396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5812b322437c9f6216236d02f27efb69268be5ec49cc31611538ddaa690769. 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/ES8591300626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbfe886958689e570bc730684eda63d2171fa4a3f58d675f056f8b99bb70a36. 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/ES8591300627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8c45f230873c8ca32917ae6ae606f88d6a6f0af591a1f61cda277968ab8792. 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/ES8591300628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ffb083cc3dfcda1b67a051c324e45721de1c8b6a9a21b6d8010c66533adb6c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES8591300629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa24f1ee417af6e13747801af21a4274be50d3edec13ca2771a2d08284fa5d28. 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/ES8591300632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7578a7a928f15ae3588afa71f5f80b033016c67823cffba09de719e6cabcad. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES8591300642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc24e6494b982695d35f82851ca8d1db69d6881dd0048f2e408cfb42a3c09ce. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USX5G9408202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02628faeb63fd793432dbe597f3ef3a9d47d2e993c42e68e09807073a01d822e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USX5G9408205.