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diff --git a/HTTP/ProofOfWork.hs b/HTTP/ProofOfWork.hs
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+++ b/HTTP/ProofOfWork.hs
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+{- Copyright 2016 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU AGPL version 3 or higher.
+ -}
+
+{-# LANGUAGE DeriveGeneric #-}
+
+module HTTP.ProofOfWork where
+
+import Types
+import qualified Data.Text as T
+import GHC.Generics
+
+data ProofOfWorkRequirement t
+	= Result t
+	| ProofOfWorkRequirement
+		{ leadingZeros :: Int
+		, argon2Iterations :: Int
+		}
+	deriving (Generic)
+
+newtype ProofOfWork = ProofOfWork T.Text