Merge pull request #5193 from wpaulino/neutrino-assume-valid

Use routing.assumechanvalid=true by default in Neutrino mode

sample-lnd.conf

@@ -476,13 +476,17 @@ bitcoin.node=btcd
 ; Used to help identify ourselves to other bitcoin peers (default: 0.11.0-beta).
 ; neutrino.useragentversion=0.11.0-beta
 
-; Skip checking channel spentness and existence during graph validation for
-; neutrino. Enabling this option means that neutrino nodes will not need to
-; perform long rescans which block initial usage of the daemon, but comes at
-; the cost of not validating channels in your routing graph. Skipping this
-; validation means that your node may have an incorrect view of the network
-; if it receives updates for closed or non-existent channels. This could affect
-; routing, but funds are safu.
+; Validate every channel in the graph during sync by downloading the containing
+; block. This is the inverse of routing.assumechanvalid, meaning that for
+; Neutrino the validation is turned off by default for massively increased graph
+; sync performance. This speedup comes at the risk of using an unvalidated view
+; of the network for routing. Overwrites the value of routing.assumechanvalid if
+; Neutrino is used. (default: false)
+; neutrino.validatechannels=false
+
+; DEPRECATED: This is now turned on by default for Neutrino (use 
+; neutrino.validatechannels=true to turn off) and shouldn't be used for any
+; other backend!
 ; --routing.assumechanvalid=true
 
 [Btcd]