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Add fingerprinting countermeasures part

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Jonas Schnelli 2017-08-11 21:25:14 +02:00
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@ -42,6 +42,10 @@ A safety buffer of additional 144 blocks to handle chain reorganizations <I>SHOU
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.
=== Risks ===
Pruned peers following this BIP may consume more outbound bandwidth.