Merge pull request bitcoin#592 from jonasschnelli/node_network_limited

Remove second service bit from NODE_NETWORK_LIMITED/BIP159

Author: luke-jr

README.mediawiki

@@ -710,7 +710,7 @@ Those proposing changes should consider that ultimately consent may rest with th
 |-
 | [[bip-0159.mediawiki|159]]
 | Peer Services
-| NODE_NETWORK_LIMITED service bits
+| NODE_NETWORK_LIMITED service bit
 | Jonas Schnelli
 | Standard
 | Draft

bip-0159.mediawiki

@@ -1,7 +1,7 @@
 <pre>
   BIP: 159
   Layer: Peer Services
-  Title: NODE_NETWORK_LIMITED service bits
+  Title: NODE_NETWORK_LIMITED service bit
   Author: Jonas Schnelli <[email protected]>
   Comments-Summary: No comments yet.
   Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0159
@@ -13,44 +13,42 @@
 
 == Abstract ==
 
-Define service bits that allow pruned peers to signal their limited services
+Define a service bit that allow pruned peers to signal their limited services
 
 ==Motivation==
 
 Pruned peers can offer the same services as traditional peer except of serving all historical blocks.
 Bitcoin right now only offers the NODE_NETWORK service bit which indicates that a peer can serve
 all historical blocks.
 # Pruned peers can relay blocks, headers, transactions, addresses and can serve a limited number of historical blocks, thus they should have a way how to announce their service(s)
-# Peers no longer in initial block download should consider connection some of its outbound connections to pruned peers to allow other peers to bootstrap from non-pruned peers
+# Peers no longer in initial block download should consider connecting some of its outbound connections to pruned peers to allow other peers to bootstrap from non-pruned peers
 
 == Specification ==
 
-=== New service bits ===
+=== New service bit ===
 
-This BIP proposes two new service bits
+This BIP proposes a new service bit
 
 {|class="wikitable"
 |-
-| NODE_NETWORK_LIMITED_LOW || bit 10 (0x400) || If signaled, the peer <I>MUST</I> be capable of serving at least the last 288 blocks (~2 day / the current minimum limit for Bitcoin Core).
-|-
-| NODE_NETWORK_LIMITED_HIGH || bit 11 (0x800) || If signaled, the peer <I>MUST</i> be capable of serving at least the last 1152 blocks (~8 days)
+| NODE_NETWORK_LIMITED || bit 10 (0x400) || If signaled, the peer <I>MUST</I> be capable of serving at least the last 288 blocks (~2 day / the current minimum limit for Bitcoin Core).
 |}
 
-A safety buffer of additional 144 blocks to handle chain reorganizations <I>SHOULD</I> be taken into account when connecting to a peer signaling <code>NODE_NETWORK_LIMITED_*</code> service bits.
+A safety buffer of additional 144 blocks to handle chain reorganizations <I>SHOULD</I> be taken into account when connecting to a peer signaling the <code>NODE_NETWORK_LIMITED</code> service bit.
 
 === Address relay ===
 
-Full nodes following this BIP <I>SHOULD</I> relay address/services (<code>addr</code> message) from peers they would connect to (including peers signaling <code>NODE_NETWORK_LIMITED_*</code>).
+Full nodes following this BIP <I>SHOULD</I> relay address/services (<code>addr</code> message) from peers they would connect to (including peers signaling <code>NODE_NETWORK_LIMITED</code>).
 
 === Counter-measures for peer fingerprinting ===
 
-Peers may have different prune depths (depending on the peers configuration, disk space, etc.) which can result in a fingerprinting weakness (finding the prune depth through getdata requests). NODE_NETWORK_LIMITED supporting peers <I>SHOULD</I> avoid leaking the prune depth and therefore not serve blocks deeper then the signaled <code>NODE_NETWORK_LIMITED_*</code> thresholds.
+Peers may have different prune depths (depending on the peers configuration, disk space, etc.) which can result in a fingerprinting weakness (finding the prune depth through getdata requests). NODE_NETWORK_LIMITED supporting peers <I>SHOULD</I> avoid leaking the prune depth and therefore not serve blocks deeper then the signaled <code>NODE_NETWORK_LIMITED</code> thresholds.
 
 === Risks ===
 
 Pruned peers following this BIP may consume more outbound bandwidth.
 
-Light clients (and such) who are not checking the <code>nServiceFlags</code> (service bits) from a relayed <code>addr</code>-message may unwillingly connect to a pruned peer and ask for (filtered) blocks at a depth below their pruned depth. Light clients should therefore check the service bits (and eventually connect to peers signaling <code>NODE_NETWORK_LIMITED_*</code> if they require [filtered] blocks around the tip). Light clients obtaining peer IPs though DNS seed should use the DNS filtering option.
+Light clients (and such) who are not checking the <code>nServiceFlags</code> (service bits) from a relayed <code>addr</code>-message may unwillingly connect to a pruned peer and ask for (filtered) blocks at a depth below their pruned depth. Light clients should therefore check the service bits (and eventually connect to peers signaling <code>NODE_NETWORK_LIMITED</code> if they require [filtered] blocks around the tip). Light clients obtaining peer IPs though DNS seed should use the DNS filtering option.
 
 == Compatibility ==