An open protocol to bind and scale Bitcoin and Ethereum to build fast trust-minimized trade networks. Hashflow provides the speed, convenience, and liquidity features of traditional financial exchanges and OTC desks along with the non-custody, transparency, and solvency features associated with DEXs. Hashflow allows anyone to perform automated issuance, execution, custody, credit, clearance, and settlement functions as well as provides collateral management, transparency, audited market data, and cross-chain trading at nearly null cost using SPV Proofs and Proof of Solvency.