Akay is one of the first Swedish graffiti-influenced street artists, and has received international attention.'Post-it' building's graffiti art, BBC News, 31 July 2007.Rob Walker, 'Painting the Town (
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 0x0590a3980823e9a598b932dc18ab29e3304a15e55709d80862adf468f2abcf53. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/635e6b8b-fa38-4fa9-838f-1caef8b17c38.json and https://artists.proofprofile.net/proofs/artist/635e6b8b-fa38-4fa9-838f-1caef8b17c38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).