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 0x212f5cb15328718ce7a13deb09084f988597f6ce0e58ab8f19e77097a60c4fd0. 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/45bbf829-938b-4d77-b8c0-5017d7115245.json and https://artists.proofprofile.net/proofs/artist/45bbf829-938b-4d77-b8c0-5017d7115245.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 0x7670f159bfa177d4bd6fe654d84e26ffc219e4f01e22a3a81b25b36b45628377. 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/QZHN71939773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6213ebdff155968f7680e73865f4ae76f51b97fec4d51673c49fe812ab9920f4. 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/QZHN71939778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900e04ed8a68dd9c53fb0a59a877489bff9ec76a2ffb17ff06d2c4608b9a6d1f. 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/QZHN71939779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0a7053ad42041f998496395845e5dc36423a8f2953c8a7f6f25d7540b2b44c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:19:08Z), 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/QZDA61817265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807c487cfe2998ba186bdd2ba73757c818adb92bb5a33e220c28b91c67666611. 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/QZDA61817266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f25a354f4118b1e84d811027fc6dd3c132c647fbe60cd312a8cfc380fc8dbb. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:33:24Z), 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/QZDA61817270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d343a4325a5b5be7567017f943bf8c229548596e6cd856fe81b9e4173827d9. 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/QZDA61817274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be6c2e2b90ed8d217fa9585dce518a58f299fca14bd5effc07b16ae64a14b25. 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/QZDA61817275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4702e288b121e6306ac1ad20c2bf2a3c70c17a3ef59bc07413668d235513b17. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA61817276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d806b6d222c5b0a4560c04ac13e41b65158d7f74f42c006de7930d456e4085. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:32:59Z), 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/QZK6L2351099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bc6f4ec6dac6574a302a96afe6a75656d3294faae3d225db810de66bb8c5df. 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/QZHNB2298446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c76d377f138ca1888305f511138fe02201288d2a22788dc4c0d9a7aa5739fc. 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/QZHN72260993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b223fb89a73ff74ca3aeb3a671cd7cd59135e5337f055ddf8122d38eec81981. 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/QZNWW2167516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79edb2337abbbd18d716b64fc835fd3b27ddd091b7cec06a88c372a2b4aed794. 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/QZHNA2141935.