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65 lines
1.8 KiB
65 lines
1.8 KiB
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BIP: 35
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Title: mempool message
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Author: Jeff Garzik <jgarzik@exmulti.com>
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Status: Accepted
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Type: Standards Track
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Created: 2012-08-16
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[[abstract]]
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Abstract
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~~~~~~~~
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Make a network node's transaction memory pool accessible via a new
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"mempool" message. Extend the existing "getdata" message behavior to
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permit accessing the transaction memory pool.
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[[motivation]]
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Motivation
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~~~~~~~~~~
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Several use cases make it desireable to expose a network node's
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transaction memory pool:
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1. SPV clients, wishing to obtain zero-confirmation transactions sent
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or received.
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2. Miners, to avoid missing lucrative fees, downloading existing
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network transactions after a restart.
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3. Remote network diagnostics.
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[[specification]]
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Specification
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~~~~~~~~~~~~~
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1. The mempool message is defined as an empty message where pchCommand
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== "mempool"
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2. Upon receipt of a "mempool" message, the node will respond with an
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"inv" message containing MSG_TX hashes of all the transactions in the
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node's transaction memory pool, if any.
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3. The typical node behavior in response to an "inv" is "getdata".
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However, the reference Satoshi implementation ignores requests for
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transaction hashes outside that which is recently relayed. To support
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"mempool", an implementation must extend its "getdata" message support
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to querying the memory pool.
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4. Feature discovery is enabled by checking two "version" message
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attributes:
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1. Protocol version >= 60002
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2. NODE_NETWORK bit set in nServices
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Note that existing implementations drop "inv" messages with a vector
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size > 50000.
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[[backward-compatibility]]
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Backward compatibility
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~~~~~~~~~~~~~~~~~~~~~~
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Older clients remain 100% compatible and interoperable after this
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change.
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[[implementation]]
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Implementation
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~~~~~~~~~~~~~~
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https://github.com/bitcoin/bitcoin/pull/1641
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