What is Node in Blockchain?

What is a node? When talking about blockchain and cryptocurrencies, a “node” is any computer that has the Bitcoin client installed. Many computers all over the world make up the Bitcoin network. This is what makes Bitcoin a peer-to-peer, distributed economic system.

Every blockchain node is a way for the network to talk to each other. There are various types of nodes, and each type is in charge of a specific set of tasks. There are four main types of network nodes in Bitcoin: full nodes, listening nodes (also called “supernodes”), miner’s nodes, and lightweight or SPV clients.

Full Node

Full nodes are very important to the network because they really support and protect the Bitcoin blockchain. According to the Bitcoin protocol, full nodes (also called fully validating nodes) are in charge of checking that transactions and blocks are correct. Blockchain technology makes the rules official, and the network’s consensus algorithm makes sure everyone follows them.


Listening nodes, also called supernodes, are the full nodes that everyone can see and access. Because of this, they can talk to any other that connects to them. Any fully validating node that is not hidden can be thought of as a listening node. This kind of node sends blockchain data to other nodes and may also act as a way for nodes to talk to each other.

Mining nodes

Usually, Miners utilize ASIC machines and specialized mining software on mining nodes, dedicating vast amounts of time and resources in pursuit of Bitcoin’s block reward. Most of the time, pool miners just provide computing power without downloading the whole blockchain. Solo miners, on the other hand, fully validate nodes. To run a full node, only the pool administrator is needed.


Lastly, the lightweight or SPV clients use the Bitcoin blockchain but do not act as validating nodes. As a communication endpoint, all they do is get information from supernodes. Because of this, these nodes do not store a copy of the blockchain and do not help keep the network safe.