The invention provides a bidding and tendering
information processing method and terminal based on a block chain, a bidding and tendering supervision
information processing method and terminal, a bidevaluation
information processing method and terminal and a bidding and tendering
system based on the block chain. The block chain comprises a bidding node, a bidding node, an expert node and a supervision institution node, and the bidding information
processing method comprises the following steps: encrypting bidding information, and
broadcasting the encrypted bidding information to a block chainnetwork; generating an intelligent contract, and
broadcasting the intelligent contract to the
blockchain network to extract review expert nodes; and when a bid winning result is received, verifying the bid winning result, if the
verification is passed, encrypting the received contract file, and
broadcasting the encrypted contract file to the
blockchain network. According to the invention, the transparency of bidding and tendering is improved, and heavy loss caused by tampering of bidding and tendering information is avoided.