Paul Breisach (June 3, 1896 – December 26, 1952) was an Austrian-born conductor. He was a pupil of Heinrich Schenker in Vienna from October 1913 for several years. New Grove 2 reports that he was a
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 0x29e68169fab5b2d2a8ae6ef5a9fee67fb03ebc24d8a26f6cdbe9f0b167cb02a2. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4644b00d-38bd-4960-9583-4a61478f1b32.json and https://artists.proofprofile.net/proofs/artist/4644b00d-38bd-4960-9583-4a61478f1b32.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Lauritz Melchior, The King Size Hero, Vol. 3 (Recordings 1920-1947)