What is blockchain node and how it works?
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Blockchain consists of a set of blocks
Several facts to remember:
- A blockchain block is not a node.
- A node consists of a group of blocks together.
- A node contains a copy of the transaction history on the blockchain.
Basic types of nodes on blockchain
1. Full node:
- Stores entire transaction history of blockchain data
- Functionalities include block validation, states verification
- Fulfill data request
2. Light node:
- It only stores the header chain
- Able to do data validation according to the state roots in the block headers
- Suitable for low-capacity devices
3. Archive node:
Similar to the full node but build an archive of historical states
- Not for average users but suitable for block explorers, wallet vendors, and chain analytics
There are other types as well,
In general, a node can do the following:
A miner tries to broadcast a new block to the blockchain.
Nodes check whether a block is valid or not. According to the transaction history, nodes have the right to accept or reject the league.
Nodes broadcast this transaction history to other nodes to synchronize the entire blockchain.
By the way, a miner must run a full node for block validation since the new block needs to cross-compare the transaction history.
Minimum requirements for Bitcoin and Ethereum nodes: