wiki commit

protocol/network/messages.md

@@ -1,5 +1,5 @@
 # Standard Messages
-## [version](/protocol/network/messages/version)
+## [Handshake: Version](/protocol/network/messages/version) ("version")
 ## verack
 ## ping
 ## pong

protocol/network/messages/version.md

@@ -1 +1,44 @@
 # version
+
+  
+## Services Bitmask
+The services field is an 8 byte little-endian-serialized bitfield that described peer capabilities.  The following capabilities are defined, by bit position:
+
+### Standard Services
+* 0: NODE_NETWORK
+	The node is capable of serving the complete block chain. It is currently set by all full nodes, and is unset by SPV clients or other peers that just want network services but don't provide them.
+
+* 2: NODE_BLOOM 
+	The node is capable and willing to handle bloom-filtered connections.
+
+* 3: NODE_WITNESS
+	Indicates that a node can be asked for blocks and transactions including witness data.  
+	*Bitcoin Cash nodes do not have witness data so this flag should be ignored on receipt and set to 0 when sent*
+
+* 5: NODE_BITCOIN_CASH 
+	The node supports the BCH chain.  This is intended to be just a temporary service bit until the BTC/BCH fork actually happens.
+
+### Non-Standard/Unimplemented Services
+
+ * 1: NODE_GETUTXO <img src="/_static_/images/warning.png">
+	 The node is capable of responding to the getutxo protocol request.  See [BIP 64](https://github.com/bitcoin/bips/blob/master/bip-0064.mediawiki) for details on how this is implemented.  *Supported by Bitcoin XT only*
+
+* 4: NODE_XTHIN  <img src="/_static_/images/warning.png">
+	The node supports Xtreme Thinblocks
+	*Supported by Bitcoin Unlimited only*
+
+* 6: NODE_GRAPHENE <img src="/_static_/images/warning.png">
+	The node supports Graphene blocks.  If this is turned off then the node will not service graphene requests nor make graphene requests.
+	*Supported by Bitcoin Unlimited only*
+
+* 7: NODE_WEAKBLOCKS <img src="/_static_/images/BitcoinCashFlag.svg" height=16>
+	The node supports Storm weak block (currently no node supports these in production, so this is a placeholder).
+
+* 8: NODE_CF <img src="/_static_/images/warning.png">height=16>
+	Indicates the node is capable of serving compact block filters to SPV clients, AKA the "Neutrino" protocol ([BIP157](https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki), and [BIP158](https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki)).
+
+* 9: NODE_NETWORK_LIMITED <img src="/_static_/images/warning.png">
+	This means the same as NODE_NETWORK with the limitation of only serving a small subset of the blockchain.  See [BIP159](https://github.com/bitcoin/bips/blob/master/bip-0159.mediawiki) for details on how this is implemented.
+
+* 24-31: Experimental <img src="/_static_/images/warning.png">
+	These bits are reserved for temporary experiments. Just pick a bit that isn't getting used, or one not being used much, and notify the community. Remember that service bits are just unauthenticated advertisements, so your code must be robust against collisions and other cases where nodes may be advertising a service they do not actually support.