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 0x5af84a9f31958340b1bb3f5b335ff41a8eb85814eb50b5ba4423551d97a48939. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7519c7d2-dda6-41ba-9896-189614645db5.json and https://artists.proofprofile.net/proofs/artist/7519c7d2-dda6-41ba-9896-189614645db5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rossini: Matilde di Shabran (1821 Version) [Live]
Lindpaintner: Die sicilianische Vesper, Op. 332 (Sung in Italian as Il vespro siciliano) [Live]
Donizetti: La fille du régiment, A. 56 (Live)
F. & C. Doppler: The Complete Flute Music, Vols. 11 & 12