スマートコントラクトでどんなデータを保存できる ref: https://qiita.com/blueplanet/items/adab0bb5c77b1d8a3959

file0.txt

pragma solidity ^0.4.0;

contract StringSaver {
    string storedData;

    function set(string newString) public {
        storedData = newString;
    }

    function get() public constant returns (string data) {
        return storedData;
    }
}