Matti Kalervo Lehtinen (24 April 1922 – 16 August 2022) was a Finnish operatic baritone, a long-term member of the Finnish National Opera, and professor of singing at the Sibelius Academy. He appe
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 0xd3eeb82df2368fa2bfbc0542ab21dbbb6feca760305efcffff439433e6a58651. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.json and https://artists.proofprofile.net/proofs/artist/cfebda46-c8c2-49f7-abe1-ae7cca91d70d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Matti Lehtinen, Sakari Halonen ja Ture Ara