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 0xfbb73a86756deda971fe2513c429fc16eab26aad9bc357f8d8e97f8a1167134f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37f70400-0b3d-4384-910f-63f8e168cac5.json and https://artists.proofprofile.net/proofs/artist/37f70400-0b3d-4384-910f-63f8e168cac5.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 0x7a2f74fdcbdcea68ac99c429edcdb6981c20eed91aa600233efd4bc4876de322. 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/TWP012133401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588519303c9867bfb88ee6985a8debac41e22dba7875e18a30c7c2b07ed1e77e. 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/TWP012133402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8f53930a8d6d742c92c3f5a532db0d162ae8c4ffc42e6845f66ed9bf131645. 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/TWP012133403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8983eb1bee396adab6387a220a4824e17380aecac26d383c730045911e4ddeb6. 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/TWP012133404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f757c81da52854ad6a23d11afd8b066cf3a7214e324d2affef9427417a4f69. 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/TWP012133407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660aa0fb54c252779e4272d3403e3e6ad0d6d94b78e4744c2dc316b69d30aceb. 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/TWP012133408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c2cea1a956c0574f4e6fb61799dfa09267a367852cb4251b9285bf8a997775. 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/TWP012133409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184926e0fce2fb61cac2b660382b121a0a5e45c449a5f9920df3a27c46b08495. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWA171300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b0d1e2ea92dcfdf7710eb5ce66d1be0939fa85cf05bfb50b23e185f95285d6. 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/TWA171300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f261572dd51ff80d72e89b9e659cab33b64c8e20bc510f21600b7f86ad52b2. 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/TWA171300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecbd105a0ebfedaecb50fdfc14c854e734f09778b5f609546b453e0c7a2ac07. 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/TWA171300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f811ee6ee95aff6a728bf91ab5f573a39f99aa065f025fb2052ca9bed404bf. 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/TWA171300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6434646afc962065e7c2edce8762d6e3f5b8f1434f71d034fa768e7232611ce8. 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/DGA062352724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f1ca4e14a626c01c70d89602d885e5922d714e474e35d65c8f4ac846205cfc. 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/DGA062352725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fd6adedf63ae146caf1328f865e534946158e0d3aecb49424d8ac2d2f7d75c. 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/TWA171300202.