The blockchain was 16 GB in March ' Today it is a hair below GB. Since Jan the Blockchain's size increase has been exponential. It doubles in size . A blockchain, originally block chain, is a growing list of records, called blocks, that are linked In August , the bitcoin blockchain file size, containing records of all transactions that have occurred on the network, reached 20 GB ( gigabytes). Charts providing a snapshot of the Bitcoin Cash (BCH) ecosystem.