If e-voting is currently being used, what type(s) of technology used?

NEC official's response: The NEC applied the following blockchain^* technology to the online voting system to strengthen the security and reliability of online voting:
- Data is distributed and stored in real-time on blocks of many nodes^** other than the central server.
- The connection between blocks is in a hash function that it is impossible to falsify or modify voting data.
- It is possible to compare and verify voting data and counting results between the database and each node.
* Blockchain security technology: As data is stored in a distributed data storage environment called 'block,' connected countless times in the form of a chain, no
one can modify the data arbitrarily.
** Node: Individual servers participating in the blockchain network