In any event, when the node receives and validates a block, it deletes any transactions in the block from its mempool.Ī full node is one that validates blocks and transactions and relays them to other nodes. If the node has received transactions that violate its policy, however, the mempool will be a subset. In many cases, this may be the full set of transactions that the node has received and validated. Mempool ("memory pool" or "transaction pool")Ī set of transactions which the node knows about and chooses to store in memory and relay to other nodes, and which have not yet been included in a block.
GITHUB BITCOIN CORE CODE
Most of the P2P code can be found in net.h/net.cpp. The bitcoin network uses a custom set of P2P messages. Communication includes discovering and connecting to other nodes exchanging various P2P messages (e.g., messages containing blocks and transactions) occasionally, banning misbehaving peers.
What is important is that if such a transaction is transmitted to the node as part of a newly mined block, the node does not reject the block.Ĭode relating to communications with other nodes (peers) over the P2P network. For example, a node could refuse to relay or store any transaction that is larger than 200KB. A node's algorithm for which transactions to store in its transaction pool is an example of policy. The node has fully validated the blockchain, although it may not necessarily maintain a full copy of it on disk.Ĭode that validates blocks and transactions.Ĭonsensus code must have bug-for-bug compatibility across versions and implementations (meaning, 0.12 must have the same consensus behaviour as 0.11, even if it is buggy otherwise, a network fork may result.)Ĭode that implements a particular node's policy (as opposed to consensus). These pages document the "relay node" aspect of Bitcoin Core, meaning a node which validates blocks and transactions and relays them to other nodes. These pages are loosely based on the set of pages called "Satoshi Client: xxx" (on this Wiki) which were written in 2011 and based on version 0.3. Additionally, each new release of Bitcoin Core (0.12, 0.13, etc) could have a new set of pages that are modified to match that version.
Ideally, the accuracy of the information on these pages would be checked by developers who are getting up to speed on the Bitcoin Core code base. The purpose of this set of Wiki pages is to document the Bitcoin Core C++ source code, in a way that is helpful to the programmer who wants to learn how the program is designed and what the code does. Organization & Maintenance of these Pages
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