What is a blockchain node? The computers that keep crypto running
By SendPay Business · · 2 min read
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A node is a computer that runs a blockchain's software and keeps a copy of its records. Nodes check new transactions against the rules and share them with each other, so no single company controls the network.
What a node does
- Downloads and stores a copy of the blockchain.
- Checks each new transaction and block against the network's rules.
- Rejects anything invalid, such as someone trying to spend the same coins twice.
- Passes valid transactions and blocks on to other nodes.
Types of node
Full nodes store and check the whole history. Light nodes store less and rely on full nodes for some checks, which suits phones. Mining nodes and validators go further and actually add new blocks, using proof of work or proof of stake.
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Why many nodes matter
Because thousands of independent nodes each hold a copy and check the rules, changing past records or breaking the rules would mean fooling most of them at once. That's what makes public blockchains hard to tamper with.
Where SendPay fits
SendPay platforms let your customers buy, sell and hold crypto, held with regulated partners, alongside GBP, EUR and USD accounts and branded Visa cards under your own brand.
How it works
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Questions people ask
What does mining cost and earn?
Work out mining income against power costs.
Bitcoin mining profit calculator →What is a blockchain explorer?
A website for looking up transactions on a blockchain.
Blockchain explorer →Read next
Spotted a mistake or something out of date? and we'll fix it. How our guides are made
This guide is general information, not legal or financial advice. SendPay Business is a technology company, not a bank, and does not take deposits; regulated services on the platforms are provided by licensed partners. Other companies named in this guide are reference points only and are not affiliated with SendPay Business.