SubmitBlock
SubmitBlock is an RPC (remote procedure call) command in the Bitcoin Core client that allows a Bitcoin node to broadcast new blocks on the network. It is one of several methods for propagating new blocks in the blockchain, which are needed for miners to confirm and add them to their local copy of the chain.
When a mining node finds a valid block, it broadcasts it across all its connected peers using SubmitBlock. Upon receiving this message, each peer then verifies the block and attempts to propagate it further by sending out another SubmitBlock message. This process continues until all nodes have received and verified the newly-found block, at which point they can start working on finding subsequent ones.
The purpose of having multiple ways of broadcasting new blocks is so that if one method fails or becomes congested due to high volume traffic – such as during periods when many users are making transactions – other methods can be used instead. Having diversity also increases resilience against potential attacks like Sybil or double-spend attempts since not relying on any single source makes it more difficult for attackers to manipulate or hijack data transmission channels.
SubmitBlock works best when used with other propagation technologies such as FIBRE (Fast Internet Bitcoin Relay Engine). By combining these methods together, nodes can quickly announce newly found blocks while ensuring they remain secure against malicious actors trying take advantage of system weaknesses.