Markku is a given name. Notable people with the name include: Markku Alén (born 1951), Finnish former rally and race car driver Markku Aro (born 1950), Finnish singer who performed on Eurovision cont
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 0xb5a270393ad71f15ebc5e41acfed7e033da3057277335393fc8b9eb936bb5fca. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/741b51e9-f96c-4376-8067-4d2d3803db86.json and https://artists.proofprofile.net/proofs/artist/741b51e9-f96c-4376-8067-4d2d3803db86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).