Cytus is a collection of rhythm games developed by Taiwanese game developer Rayark. The original Cytus rhythm game was first released on the iOS platform on 12 January 2012. The game was later release
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 0x94c8a3aff3d62c7ad141fde0d94d69f101849792ce75506d341bb85f62fb0e3c. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a12b769f-e3c7-4cef-9cff-dfb29229c551.json and https://artists.proofprofile.net/proofs/artist/a12b769f-e3c7-4cef-9cff-dfb29229c551.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).