Kaarlo (Kalle, Kassu, Kalakku) Alvar Päätalo (11 November 1919 – 20 November 2000) was a Finnish novelist, the most popular Finnish writer in the 20th century. His Iijoki series, comprising 26 novels,
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 0x2cc42791681a9c46942a70deb478097adae21cc34377e3fd1fa7989ce301fa92. Chain 2 (Bitcoin): anchored in block 953847 (2026-06-15T22:51:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0084796e-1a7a-4130-b810-512b6c4b9299.json and https://artists.proofprofile.net/proofs/artist/0084796e-1a7a-4130-b810-512b6c4b9299.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).