Wanchain is both a sustainable Layer 1 PoS blockchain and a decentralised wide area network of blockchains. The Wanchain Layer 1 PoS blockchain is a full Ethereum-like environment that works with industry standard Ethereum tools, DAPPs and protocols. Wanchain uses a Proof of Stake consensus algorithm called Galaxy Consensus that leverages a variety of cryptographic schemes including distributed secret sharing and threshold signatures to improve random number generation and block production mechanisms. Galaxy Consensus, developed by world-class researchers and academics, is a continuation of Cardano’s Ouroboros. Wanchain's wide area network of blockchains is a decentralised system of direct, non-custodial crosschain bridges that connect both EVM and non-EVM networks without requiring any centralised intermediaries. These bridges use a combination of Secure Multiparty Computation (sMPC) and Shamir's Secret Sharing to secure crosschain assets. Currently, Wanchain connects more than 17 Layer 1 and Layer 2 networks.