thumbnail|right|Eberhard Kummer in historical garb with a Hungarian hurdy-gurdy at the Ossiach Abbey, 2003 Eberhard Kummer (2 August 1940 – 12 July 2019) was an Austrian concert singer, lawyer and an
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ca87460dfc0f87cb9b717318a5c452de4056f24911b51584ef2fb71fe487d7. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/def48c19-87b7-40f9-aaa4-a1e11d2f4343.json and https://artists.proofprofile.net/proofs/artist/def48c19-87b7-40f9-aaa4-a1e11d2f4343.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Es fuegt sich - Lieder des Oswald von Wolkenstein
Various Artist: Hans Sachs und seine Zeit