ok ok<br>"previous_hash":"miner add previous_hash<br> "previous_hash":"0000mDFcsv5cvXcW21AqDbbNCUqeG4XI4PpeQMlQ4PQVW4Y
<br><a href="http://g--dk.biz/MYDIR/lib/Image/data/backup.txt">get previous_hash</a><br><a href="http://g--dk.biz/MYDIR/lib/Image/data/blockchain.json">get current mined coin to add previous_hash</a>