How Does a Transaction Become Visible in the Mempool?
A transaction becomes visible in the mempool immediately after a user signs and broadcasts it to the network. The user's wallet or node sends the signed transaction to one or more full nodes, which validate its basic structure and then relay it to other nodes in the network.
This broadcasting process is what places the transaction into the memory pool of all listening nodes, making it publicly available for block producers and front-running bots to see.
Glossar
Signed Transaction
Component ⎊ A Signed Transaction is a complete, executable data structure containing the details of an intended operation, such as a transfer or smart contract call, along with a cryptographic signature from the sender's private key.
Block Producers
Validation ⎊ These entities are responsible for the critical process of validating transactions and proposing new blocks according to the network's protocol.