When the sensor acquired the information, these microcomputers competed for searching hash values. In this case, the left side microcomputer found the correct answer of zero 2 digits at the head in calculation of the 43th hash value. In this case, calculation of the hash value is performed up to 60 times and it is set to give up if the correct answer is not found, so the microcomputer on the right side failed “mining” and decided to adopt the information on the left side microcomputer.
If some information is missing at a microcomputer, they hold the same information in all the microcomputers at the end. If one attempted to insert a false data to the block chain, it was found that contradiction occurred in the hash value and it could not be added. Actually trying out, I understood well what the block chain is.