Block sealing refers to the process of finalizing a block in a blockchain. Once a block is sealed, it becomes a permanent part of the blockchain, meaning its transactions are immutable and can no longer be altered.

This process often involves reaching consensus among network participants. Different blockchain protocols have various methods for achieving this, such as Proof of Work or Proof of Stake.

When a block is sealed, it is typically linked to the previous block, forming a secure chain that is difficult to tamper with. Block sealing is crucial for maintaining trust and security within a blockchain. It ensures that all participants have a consistent view of the transaction history.

Once sealed, a block represents a record of validated transactions, making it an essential step in the operation of cryptocurrencies. Overall, block sealing ensures that transactions are secure, verified, and resistant to fraud, helping to uphold the integrity of the entire network.