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 0xcd1038dd2c31a5fcbf460084d223245298d7d50d83d03899566385d3555c5314. 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/e459ccd8-316a-41d5-8eaf-f3149e8c286c.json and https://artists.proofprofile.net/proofs/artist/e459ccd8-316a-41d5-8eaf-f3149e8c286c.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 0xf9408ce7f3f13a97765622869b177361c2d3517230fedaec773ae1e80ca94722. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/TCACY1775732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d9ad81e57c5779af84824a7656971d3ae690be78fd76c550d702dae38466a8. 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/FRX281700370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a780b494e8ab5c08244e4d078ff318566b5f66902c7386f32f336ca9e49814. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR2X41858403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa21c992c9ea54cba907617c49d07e748c3e5f46664b17eb25ec5df21ddd17f4. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/FRX851901714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca2824edc58529c556aa0421c7881aaf3559418811f1787422401584cde91c8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/FR9W11829691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc96da8ceb28da516088d6aaa454437e802a5c6301d71ecbd88eda5efe2cced8. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/FRX851901664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81077446073ddc794f07291323c309c5c7d4443b8d47646b02fbd88106de49d7. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FRX851901667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedcdd99c9cd1c8f3d3a2bf4f153bc75dd4cbab5c26be2ee23e78619b989a95c3. 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/FRX851901668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5faee60636cd545e1e8aeb32d5938e3cdba2d777b7c7133ca44e3d6f326e5a5. 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/FRX851901669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5b087e0c1f7536e46079aa5696525d8c28b53ab89cf7e250d977eedfcf8b24. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX851901671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1373be1a2a5ed2977a471fb4e5afb66470758428ced5372891951dd25313455d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FRX851901672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb222db76c02efd62d0a37ec802ecd11873ef7c67db3d72fa5761d24b248eac61. 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/FRX851901673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753a618b3a8ca40c4c68d0f80efed3e000c092b9422bffb3dbfc725450025841. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FRX851901675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b671c2b538623a5bc3f5e890bd35f64069adcd934760f10f9dd4a1fa4be4c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX851901737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cd72278f9910921b1c9544b5fbfd8d24745d110a19d823183d6532e566e9ab. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/TCAHB2399968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc664032f4741c4d4d8ae97386b75ced31ec975dfcd75291fc0bf9f13e055faca. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCAHE2357316.