thumb|Vogel in 1990 Harald Vogel (born 21 June 1941 in Ottersberg) is a German organist, organologist, and author. He is a leading expert on Renaissance and Baroque keyboard music. He has been profess
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 0x60e661c319b3207716f94e74735e3c05fb61238edd4c678bb6479d8082a1c8e0. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f08ed81-b151-4690-bdb0-6c0f2fc92804.json and https://artists.proofprofile.net/proofs/artist/3f08ed81-b151-4690-bdb0-6c0f2fc92804.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Arp Schnitger and the Hamburg Organ Tradition
Vogel, Harald: Recital at Church of the Ascension