Add bip-txrelayv2

Author: Antoine Riard

bip-txrelayv2.mediawiki

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+<pre>
+  BIP: XXX
+  Layer: Peer Services
+  Title: Transaction Relay V2
+  Author: Antoine Riard <[email protected]>
+  Comments-Summary: No comments yet.
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0339
+  Status: Draft
+  Type: Standards Track
+  Created: 2024-09-05
+  License: GPLv2
+</pre>
+
+==Abstract==
+
+This BIP proposes a new Bitcoin transaction relay protocol by introducing new
+signaling support, which can be further used by nodes to negotiate new transaction
+relay mechanisms and policies.
+
+==Motivation==
+
+Historically, nodes have been exchanging transactions on the Bitcoin peer-to-peer
+network by sending an inv, and if the transaction has not been discovered and processed
+yet by the other peer, sending a dedicated tx message.
+
+Sending an unnannounced tx message has always been considered in conformity with
+the protocol, however this behavior creates a denanonymization vector if leveraged
+by mass connectors.
+
+We can eliminate this concern by using node service bits to signal support for
+a new v2 transaction relay protocol. Within this protocol, nodes can negotiate new
+transaction relay mechanisms and policies.
+
+==Specification==
+
+Peers supporting the v2 transaction relay protocol signal support by adverstising
+the 13th bit service flag in the addr p2p messages (`ADDR` and `ADDRV2`).
+
+==Backward compatibility==
+
+Older clients remain fully compatible and interoperable after this change.
+
+==Implementation==
+
+https://github.com/bitcoin/bitcoin/pull/30572
+
+==Copyright==
+
+This BIP is licensed under the GPLv2.