Crypto glossary

Full Node

A full node is a computer running blockchain software that downloads and independently validates every block and transaction against the network's consensus rules, without trusting anyone else's word that they are valid.

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What a full node does

When a Bitcoin full node starts, it downloads the blockchain from other nodes and checks all of it from the genesis block onward: that signatures are valid, that no coin is spent twice, that block rewards do not exceed what the rules allow and that each block meets the proof-of-work requirement. It keeps the current set of unspent outputs (UTXOs) and relays valid transactions and blocks to its peers.

Anything that breaks the rules is rejected, even if a miner produced it. This is how the network enforces properties like the fixed supply limit of 21 million bitcoin without a central authority.

Full nodes, light wallets and miners

Many mobile wallets are light clients: they rely on other servers or nodes to tell them about transactions and verify only part of the data. That is convenient but requires some trust. Miners also run nodes, but running a full node does not mean mining; most full nodes only validate.

A pruned node is still a full node. It validates everything but deletes old block data after checking it to save disk space. An archival node keeps the complete history.

An example

Say a miner publishes a block that pays itself one extra bitcoin beyond the allowed reward. Light wallets that trust that miner's server might accept it. Every full node, checking the rules itself, rejects the block, and its own wallet never shows those coins. If you connect your wallet to your own full node, you get that same independent check.

Costs and limits

Running a Bitcoin full node takes a computer with several hundred gigabytes of storage, unless pruned, a steady internet connection and an initial sync that can take hours to days. It earns no rewards. A full node also does not protect your keys: you still need good self-custody practices, and validation only tells you what the chain contains, not whether a counterparty will keep a promise.

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Frequently asked questions

Do I get paid for running a full node?

Not on Bitcoin. The benefit is independent verification, privacy and supporting the network, not income.

Is a full node the same as a miner?

No. Miners create new blocks; full nodes check blocks and transactions. Miners run full nodes, but most full nodes do not mine.

Do other blockchains have full nodes?

Yes. Most public blockchains have full nodes that validate their own rules, though hardware requirements vary widely between networks.

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All glossary terms · Educational reference only — not investment, legal, tax or financial advice.