ChainX

ChainX is a Substrate-based Bitcoin layer 2 and cross-chain asset gateway with PCX as its token, serving holders who want BTC inside DeFi and developers in the Polkadot ecosystem. Bitcoin lacks smart contracts and cross-chain custody tends to rely on centralized intermediaries, so assets often lose their native properties after moving.

Its bridge has four parts. Light nodes sync source-chain headers and check Merkle proofs, a relay engine forwards the verified result, and a vault holds native assets under threshold multisignature custody run by community-elected trust nodes, minting 1:1 representations such as xBTC. The network uses hybrid Babe and GRANDPA consensus, separating block production from finality. Mining weight derived from bridged assets is capped at 10 percent of the network, with the rest supplied by PCX staking, so external assets cannot dominate block production or governance.