Block Size

Simple definition of Block Size
  • The size of individual blocks on a blockchain can have a potentially large impact on the speed and capacity of the network, but there are always trade-offs.
  • The block size is simply the maximum limit a block can be filled up with transactions. For example, the Bitcoin block size currently stands at 1 MB. Miners can choose how much of a block to fill with transactions.
  • However, if a block that exceeds the block size limit is submitted, it will be rejected by the network. The intention of a block size is to prevent denial-of-service attacks on the network. If there was no block size limit, in theory, an attacker could flood the network with lots of transactions, therefore potentially bringing the network to a halt.