The invention belongs to the technical field of tax 
system credit investigation management, and discloses a tax 
payment credit investigation 
system based on a block chain and a 
processing method, andthe method comprises the steps: accumulating data of each mechanism to a unified block chain platform, and integrating all information; using a specific 
consensus algorithm to input credit data into the block chain, and analyzing and calculating individual credit scores to form a huge information set; meanwhile, enabling the 
open port to continuously accept resources to form an information network, so that all participants are equivalent and mutually beneficial; constructing a tax platform introducing an interstellar 
file system using the interstellar 
file system for uploading duplicate text information, and directly storing a returned hash value and a small tax 
payment data file on a block chain which is used for a tax 
system and a credit alliance and caching the value and file in a standby traditional 
database at the same time. According to a 
data sharing method based on the block chain, member nodes in the regional autonomous alliance are mutually constrained and supervised while sharing data, and 'information island 'phenomenon is solved.