Michael Mantler (born August 10, 1943) is an Austrian avant-garde jazz trumpeter and composer of contemporary music. Career: United States Mantler was born in Vienna, Austria. In the early 1960s, h
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 0x6297d0b74d84f95d10e5f84af9845008e44cd59bfe3f86bf4065aa8147b1bf5d. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/caba72fc-79e0-4c21-853c-f868d3cd4e52.json and https://artists.proofprofile.net/proofs/artist/caba72fc-79e0-4c21-853c-f868d3cd4e52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Hapless Child And Other Inscrutable Stories
Michael Mantler / Paul Auster: Hide And Seek
The Jazz Composer's Orchestra - Update (Live)