A blockchain, originally block chain, is a growing list of records, called blocks, which are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a merkle tree root hash). [en.wikipedia.org/wiki/Blockchain]
{"currency":[{"name":"US Dollar","abbr":"usd","symbol":"$","type":"fiat","priceBtc":168.09507344948}],"appuser":null}