ParallelChain is a scalable blockchain ecosystem of two layer-1 platforms: the public Mainnet and Private networks. All networks are interoperable at the protocol level through a secure and private channel called Inter-ParallelChain Communication (IPC). IPC serves two purposes in ParallelChain. It provides an interface between the metaverse and the real world by enabling applications to operate across public and private layers. Second, it allows networks on the private layer to piggyback on the Mainnet's consensus and enjoy stronger security while preserving their privacy and autonomy. Another feature in this IPC-powered consensus is Inter-ParallelChain Proof-of-Immutability (IPPoIM) - an auditing function designed to remove the trust barrier between members of a private network by enabling them to verify the network's tamper-proofness without accessing on-chain data.