Peter Mark is an Irish hairdressing chain founded in June 1961 by brothers Peter and Mark Keaveney. The first shop they opened was on the first floor of 87 Grafton Street, Dublin.Head to Toe, 10 Novem
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 0x76970b9f23faf1d8f0e20cf81c0f74bbf01a96691afebcf7ea2076a4e535b352. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2920328a-638d-45f0-851b-37a91141d9b0.json and https://artists.proofprofile.net/proofs/artist/2920328a-638d-45f0-851b-37a91141d9b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).