The ILCoin blockchain is an on-chain data storage system; developed not only to provide a foundation for the ILCoin cryptocurrency, but also to open up possibilities for secure, transparent data storage, the establishment of various smart contract systems and the launch of decentralized applications running on ILCoin blockchain systems. ILCoin started as an alternative to Bitcoin (BTC). Since then, it has built its own blockchain network. ILCoin's blockchain network is a Decentralized Cloud Blockchain System where on-chain data storage is secured and managed by a quantum-resistant SHA-256 Command Chain Protocol (C2P). The ILCoin Blockchain System claims to be immune to third-party 51% attacks.