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 0x2c9c4e47e604ceb4542cfac08237b1817ea3415b3868869e85ab8efdc5853219. 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/698e4c7c-90ad-4a1e-a93f-29318500a0ac.json and https://artists.proofprofile.net/proofs/artist/698e4c7c-90ad-4a1e-a93f-29318500a0ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Graupner: Complete Cantatas for two sopranos and bass
Graun: Iphigenia in Aulis, GraunWV B:I:2
Vom Himmel hoch, da komm ich her: Weihnachstkonzerte aus Leipzig (Live)
Cantatas for the Hanoverian Kings of England
Johann Sebastian Bach: Matthäus-Passion, BWV 244: Arie: Blute nur, du liebes Herz!
Georg Philipp Telemann: Inauguration Cantatas 1721
Inauguration Cantatas for Hamburg & Altona
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