Blockchain 101 Ep 19 - What are Bitcoin nodes?

Bitcoin is a peer-to-peer electronic cash system. Or, node-to-node.

In every transaction, the sender sends information to surrounding nodes, which broadcasts to their surrounding nodes, covering the entire network. Every Bitcoin wallet acts as a node. Among them, full nodes store the entire ledger.

As of October 2017, the Bitcoin network has around 9300 full nodes running, responsible for broadcasting and validating transactions. When a transaction occurs, all nodes will relay the information to the entire network. After validation, nodes will verify and update the transaction on the blockchain. USA, Germany and France have the most number of Bitcoin full nodes. China accounts for 5% of full nodes worldwide. Since there are no rewards for maintaining nodes and Bitcoins can still be transferred without relying on full nodes, full nodes only make up a small percentage of nodes in the network.


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