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 0x7465a5de37acf50e326e60f8d8adb05894100e36a3b5b18600e94d9d81d5c57e. 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/26b29e58-e415-4a7f-91eb-075706942feb.json and https://artists.proofprofile.net/proofs/artist/26b29e58-e415-4a7f-91eb-075706942feb.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 0xf600693e2e99dd0d2e6b8c7b3502254932b2a209d1e5b955dd3f56a258179f87. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFZ22328295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82a2e252b9f09708ac6f1d4583d63c62f768e03cd3e985ec9af280e6b7a4953. 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/QZFZ22328296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8becdb45fb2334e88d0b1aa851cba0ca9e9c960954b1fa99415e7c7916e54ea0. 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/QZTB62221786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e44d9d7cfd0758c34fc5009c066e6beaf967e9b48f9373edf83263dc0ba3fa. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZFZ22328297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa419d5f2aaa81ea32ec0b98fab459debde8c0c5c1a8473388d709acfd3f7d6c1. 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/QZFZ22328298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8564a7b915fb559117d87ef8caca15487f2edc1c9a87ad26154c3e8fcb7d6977. 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/QZFZ22328299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85534563d76a07fc7c1bcccb3faa6d01e7677d8daee35711567c8039e4baa462. 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/QZFZ22328300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f8ba7af265ad6c57d99f2769d3902956fa750f8141242a2863906b745a1bce. 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/QZFZ22328301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0662541868405c07b9d5b70195ba7b117583b6e5a8629b6a84418f7a000f11f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFZ22328302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9120c7fd71d9350747a7a6451348e165281671eeee4d7b92100e2a3bdd985a. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USX9P2307622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda502df8f12bfd42b5ee790c158239d22b5277302960ae9988ff0a4caa689d25. 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/QZPLS2378807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ea81c161348dd6a96bb2b41011885c6096c82d37fb28ab42716d6e57f74b7e. 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/ES64E2312409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d1bed0c496b7e5ce0b4a6e77231a7a7c89a238b7679aaa7c5be70549d863c6. 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/QZTB52236520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37809613cd31e89b77f34cf124b0442761df887fa43fa8277fbf20667949950c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZK6N2351703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e1909687622a99fcc31e0300b8b197f63f420294212766afb0baadb4c2b150. 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/ES71G1716577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d1a622f17d7e166adf7b1d985a533212b3ca5d8314b159e1de94fe02bae9c0. 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/QZZ7T2454500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe168101f27645c4734e8f0140e8eccdd8514b222b6c1470b2ad43fa9abc16c7d. 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/USL4Q2408876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315ccfa921f8be9ec722e6e94dcc8b154777c4b20c45d06692bd051118f9e792. 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/QZES82532077.