Multi-party contract signing method and system applied to block chain, and block chain node

The invention provides a multi-party contract signing method applied to a block chain. The method comprises the following steps: acquiring contract first draft file data uploaded by a contract signing initiator and appointed N signing parties; obtaining at least one piece of revision opinion data of the N contract subscribers on the contract first draft file data; for each piece of revision opinion data, obtaining voting opinions of N-1 signing parties except an initiator of the revision opinion data through a round of voting, and summarizing a voting opinion set of each piece of revision opinion data; based on the voting opinion set of each piece of revision opinion data, determining adopted to-be-executed revision opinion data from the revision opinion list; and on the basis of the to-be-executed revision opinion data in the revision opinion list and the revision contract first draft file data, obtaining contract revision file data. The invention further provides a multi-party contract signing system arrang