Transaction method, device and system based on block chain

The invention provides a transaction method, device and system based on a block chain, relates to the technical field of block chains, and can be applied to the technical field of finance or other technical fields. The transaction method based on the block chain comprises the following steps: receiving a block from a block chain network according to a first host state of a host; executing the transaction in the block according to the total business data of the network card to obtain a first execution result; according to the first execution result, updating the processed data and the network card total business data; and updating the first host state into a second host state according to information from the host, and sending the processed data and the block to the host according to the second host state. The method is environment-friendly and energy-saving, and the computer security and the stability of the block chain network scale are improved. 本发明提供一种基于区块链的交易方法、装置及系统，涉及区块链技术领域，可应用于金融技术领域或其他技术领域。该基于区块链的交易方