Is a blockchain just a bunch of code, what infrastructure does it need to be built? I have seen visual representations of blockchains but I haven't actually thought about what they actually look like in real life, does anyone know?
blockchain is just a data structure that can not be changed can only be added only. Each data from this blockchain is connected where if there is a change in one of the data block it will affect the next data.
With this blockchain every transaction from bitcoin is stored in an Open Ledger (Ledger) which is distributed into bitcoin networks.