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Added to relay section.

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Eric Lombrozo 2015-12-26 16:41:57 -05:00
parent 35990e2faa
commit d0ad38fb69
1 changed files with 11 additions and 7 deletions
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bip-codeshark-segwit-peer-services.mediawiki
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@ -90,13 +90,6 @@ A new message 'havewitness' is sent after receiving 'verack' to
indicate that a node can provide witness if requested (similar to
'sendheaders') (Note: it might be better to signal this with a services bit in the version message)
=== Relay ===
New inv types MSG_WITNESS_TX and MSG_WITNESS_BLOCK are added, only
for use in getdata. Inv itself still use just MSG_TX and MSG_BLOCK,
similar to MSG_FILTERED_BLOCK.
* '''Rationale for not advertizing witnessness in invs''': we don't always use invs anymore (with 'sendheaders' BIP 130), plus it's not useful: implicitly, every transaction and block have a witness, old ones just have empty ones.
=== Hashes ===
Transaction hashes used in the transaction merkle tree and txin outpoints are always computed using the old non-witness
serialization.
@ -108,6 +101,17 @@ and therefore, they have witness hash equal to normal hash.)
<img src=bip-codeshark-segwit-peer-services/witnesstx.png></img>
=== Relay ===
New inv types MSG_WITNESS_TX and MSG_WITNESS_BLOCK are added, only
for use in getdata. Inventory messages themselves still use just MSG_TX and MSG_BLOCK,
similar to MSG_FILTERED_BLOCK.
* '''Rationale for not advertizing witnessness in invs''': we don't always use invs anymore (with 'sendheaders' BIP 130), plus it's not useful: implicitly, every transaction and block have a witness, old ones just have empty ones.
MSG_WITNESS_TX getdata requests should use the non-witness serialized hash. The peer shall respond with a tx message, and if the witness structure is nonempty, the witness serialization shall be used.
MSG_WITNESS_BLOCK requests will return a block message with transactions that have a witness using witness serialization.
== Credits ==
Special thanks to Gregory Maxwell for originating many of the ideas in this BIP and Luke-Jr for figuring out how to deploy this as a soft fork.