thumb|right|Borbély at Tuborg Green Fest Peninsula festival in 2008 László Borbély (born March 26, 1954) is a Romanian economist and politician. A member of the Democratic Union of Hungarians in Roma
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 0x56ac2d98c3b4e30f6d916f3c8498f7e71b262e687e6979c500f3cbf5b5491100. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c881076a-4232-4d39-9637-190c581ca3c8.json and https://artists.proofprofile.net/proofs/artist/c881076a-4232-4d39-9637-190c581ca3c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Songs of Sorrow and Consolation (Late piano pieces by Franz Liszt)
Béla Bartók: Concerto I. For Piano And Orchestra
Mussorgsky: Pictures at an Exhibition, Balogh: Reminiscences of an Exhibition
Béla Bartók: Concerto III. For Piano And Orchestra
Major Works by Franz Liszt (Live Concert Recording)
Sergei Rachmaninoff: Etudes-Tableaux and Preludes (Live recording)
Béla Bartók: Concerto II. For Piano and Orchestra
Bartók, Ligeti: From Microcosm to Macrocosm (Live Concert Recording)