thumb|upright=1.1|George Frideric Handel Flavio, re de' Longobardi ("Flavio, King of the Lombards", HWV 16) is an opera seria in three acts by George Frideric Handel. The Italian-language libretto was
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449dc83cf864759f1dcb898d651fd2f0a281ffe70753ac4d1f65efc88a4ebb21. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65c2cbc6-a1c6-43e6-8cf2-9b0309e7812a.json and https://artists.proofprofile.net/proofs/artist/65c2cbc6-a1c6-43e6-8cf2-9b0309e7812a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199bbc73c9af5f3e78c460b5d3755597b6823d47a4457531a6204e1fc320cc5e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USX9P2061033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439b7140c257ec0a842fe7b7cf4ce6c2572428ef4569fd223c14da3473d29735. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:40:17Z), 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/USX9P2098828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe680056579fc84ae7abca8ebb7575f39ab6e8748727c64f50d6684249761a04. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:51:42Z), 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/USY282006560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519d6b098b7a6460d0c2b70801beab63aed11f7795cc56ab271dabaae0e84053. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/USCGH2114358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed67dda1b0ed2683cc20bbc8bb8f26b6bb057c0e6a6b56fddd87723edd7e34e8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDY42248933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd296123299260bce5d2f4756e5bdae04333784cf07a32980ea571e8203ac5ff. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDY42248934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79416c0a910ee5a471a18fc4da6d07c798c7e9a01a89665d016d362e9becc737. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USDY42248937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfd49cc20a5e7a955b3bc12ff2da13dec1a6edc5209962a8eee70806017d060. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGH2411643.