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 0xaf8838055692c68b8ec0614eb339fc10e2a0b4c4d2713d71870a515a3aa87c1f. 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/e0352fe0-1a17-4fd6-911a-aa809fb2f6f3.json and https://artists.proofprofile.net/proofs/artist/e0352fe0-1a17-4fd6-911a-aa809fb2f6f3.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 0x2404703bd47d045bf50c0edcacec73b27be8db674b5253cd2bf963cbc7f2840f. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/FR59R2026665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840dec7d97409a84472ced53789ad165fc53d410df497956d470f648380fc345. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:41:57Z), 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/FR59R2026671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d22792cd23dee9e9c2520f1681ed9f82d976d922fd68fd9d3476f6d59ca7e0. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T13:07:33Z), 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/GBEBR0700084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87575a297207a7bd098c5b47360aa380eefdfacf8701aa1a243e10d3f1aaff7c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:49:19Z), 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/GBEBR0700086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb28542cf0c9247ad9eef2f64b8a9cd5762c9666f2a7c50f3074870872bf792. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/INS181006877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02640157a4e47cc1d68ace6ed6ecedbb706bdf6d562dacce22b4b220d466bc42. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/INS181006879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf891d7431ba491f2745cd6309956f8674ee1b41c96d3227f112086e22cccb17. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/INS181006880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba74ce59698410bffbf371a43872e1ed1982d39cad027f42e2977f3937c45139. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USA371628328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a02be6aab9b9f3c531b04d7b56029ce94552482963be69690835f96557f9ad8. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T05:52:49Z), 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/USA371628330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf169546c6033c04e3ea11d3bc251f54d7cf4e3ef7ee83b08e43831833aad1a2c. 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/USA371628335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfabc921be7ced4ae592ccd75f83a901c864b691bd8f4bb6d19452f2d4fbee0d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INS402001090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8571f1f9cc83a8c7371c43241107432265f7cc2edb6868e57309413053d3452e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/INS402300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9e70d4c873124ab704d897cd48bd930aac805b3283ea932a29477d7b90bd2c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DGA0Q2314641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4f5986285d9c59ed6089185a887a532b939b54b112177c0032c9649a48eeb0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:42:49Z), 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/FRX452446264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550cc76c58cf68e9574015bd1e666295bd291316624fccbe422aa632409366d1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/FRX452512599.