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diff --git a/src/Ssb/Discovery.hs b/src/Ssb/Discovery.hs
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+-- | This module implements local discovery of Scuttlebutt peers.
+--
+-- https://ssbc.github.io/scuttlebutt-protocol-guide/#discovery
+
+module Ssb.Discovery where
+
+import           Protolude
+
+import           Ssb.Network
+import           Ssb.Identity
+
+-- | default Scuttlebutt Server Port
+defaultPort :: Port
+defaultPort = "8008"
+
+-- | Advertisement messages are emitted on the local network for discovery of
+-- peers.
+data Advertisement = Advertisement
+  { ipAddress :: Host
+  , port      :: Port
+  , publicKey :: PublicKey
+  } deriving (Eq)