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Merge pull request #966 from sdaftuar/2020-08-wtxid-relay-fixes

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BIP 339 clarifications
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Luke Dashjr 2020-08-20 22:16:12 +00:00 committed by GitHub
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@ -18,7 +18,7 @@ based on the BIP 141 wtxid of a transaction, rather than its txid.
==Motivation==
Historically, the INV messages sent on the Bitcoin peer-to-peer network to
Historically, the inv messages sent on the Bitcoin peer-to-peer network to
announce transactions refer to transactions by their txid, which is a hash of
the transaction that does not include the witness (see BIP 141). This has been
the case even since Segregated Witness (BIP 141/143/144) has been adopted by
@ -41,9 +41,10 @@ announcing and fetching transactions.
# A new wtxidrelay message is added, which is defined as an empty message where pchCommand == "wtxidrelay".
# The protocol version of nodes implementing this BIP must be set to 70016 or higher.
# The wtxidrelay message must be sent in response to a VERSION message from a peer whose protocol version is >= 70016, and prior to sending a VERACK.
# A new inv type MSG_WTX (0x00000005) is added, for use in both INV messages and GETDATA requests, indicating that the hash being referenced is a transaction's wtxid. In the case of GETDATA requests, MSG_WTX implies that the transaction being requested should be serialized with witness as well, as described in BIP 144.
# After a node has sent and received a "wtxidrelay" message to/from a given peer, the node is required to use the MSG_WTX inv-type when announcing transactions to that peer, or requesting announced transactions from that peer.
# The wtxidrelay message MUST be sent in response to a version message from a peer whose protocol version is >= 70016 and prior to sending a verack. A wtxidrelay message received after a verack message MUST be ignored or treated as invalid.
# A new inv type MSG_WTX (0x00000005) is added, for use in both inv messages and getdata requests, indicating that the hash being referenced is a transaction's wtxid. In the case of getdata requests, MSG_WTX implies that the transaction being requested should be serialized with witness as well, as described in BIP 144.
# After a node has received a wtxidrelay message from a peer, the node MUST use the MSG_WTX inv type when announcing transactions to that peer.
# After a node has received a wtxidrelay message from a peer, the node SHOULD use a MSG_WTX getdata message to request any announced transactions. A node MAY still request transactions from that peer using MSG_TX getdata messages, such as for transactions not recently announced by that peer (like the parents of recently announced transactions).
==Backward compatibility==