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Bitcoin: What are nodes actually do?

by Margharet Tess
March 28, 2025
in Completely Basics
Reading Time: 2 mins read

Anyone who wants to understand Bitcoin and the blockchain cannot avoid delving a little into the blockchain matter. In this article we want to take a leap into the decentralized network and take a closer look at nodes.

What are nodes and how do they work?

The best way to get an idea of ​​what nodes are is to look at them in a typical representation of a decentralized network. Of course, you cannot look at blockchain networks, they are purely digital. Therefore we have to resort to graphical representations. It can look something like this.

We see: circles connected by lines. Transferred to the Bitcoin blockchain, each of these circles would be a node, i.e. network node.

Central properties of a blockchain are immutability, decentralization and transparency. All participants can check at any time which transaction went where and when. All information is stored in the form of transaction history in the individual nodes. So they are the decentralized cornerstones of the blockchain information network. This also means: The more nodes a network has, the more decentralized it is.

What is the function of bitcoin nodes?

When it comes to nodes, we differentiate between full, mining and lightweight nodes, each of which has different functionalities. Full nodes keep the Bitcoin blockchain running and secure by storing all transaction history.

Mining nodes are special forms of full nodes that ensure that network rules are observed. They also calculate proof-of-work functions and pin new blocks to the blockchain.

Lightweight nodes, or simplified payment verification clients, or SPV clients for short, do not store the complete history of the blockchain. They only use the block header of the previous block to verify and propagate new transactions. Typical SPV clients are bitcoin wallets.

 

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Margharet Tess
Margharet Tess
Editor, Developer at Cryptheory Labs
I have been active in the cryptocurrency world for over 6 years, during which I have written countless articles about this sector. What fascinates me most about cryptocurrencies is their technological aspect and the problems they aim to solve. In the past three years, I have ventured into app development and am currently working on a larger project called P2E Buzzer. Stay tuned for the surprise. 🙂 My previous experiences: Business2Community.com, TradingPlatforms.com
Margharet Tess
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