Ico (stylized in all caps) is a 2001 action-adventure video game developed and published by Sony Computer Entertainment for the PlayStation 2. It was designed and directed by Fumito Ueda, who wanted t
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 0x352a8e6dd4e335e87f1fd7321ad2c340592a66054cfb2f8db5944419ddfca203. Chain 2 (Bitcoin): anchored in block 954039 (2026-06-17T03:00:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e6f8373-8b7b-4daf-88e4-de02a0f4fbdf.json and https://artists.proofprofile.net/proofs/artist/3e6f8373-8b7b-4daf-88e4-de02a0f4fbdf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).