diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html)
 
+## 0.46.3
+### Fixed
+- Make hex value encoding compatible with Java BigInteger decoder.
+
 ## 0.46.2
 ### Changed
 - Allow negative confirmations for compatibility with old API.
diff --git a/haskoin-store-data.cabal b/haskoin-store-data.cabal
--- a/haskoin-store-data.cabal
+++ b/haskoin-store-data.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: c253c00b9cb5278e19624620258973d4a989bc4cb42201c38cb60ba8af2e1f0a
+-- hash: e61a03aefa59e9d7ac5391663077666467af98b8973d313c73102d14af8c6658
 
 name:           haskoin-store-data
-version:        0.46.2
+version:        0.46.3
 synopsis:       Data for Haskoin Store
 description:    Please see the README on GitHub at <https://github.com/haskoin/haskoin-store#readme>
 category:       Bitcoin, Finance, Network
diff --git a/src/Haskoin/Store/Data.hs b/src/Haskoin/Store/Data.hs
--- a/src/Haskoin/Store/Data.hs
+++ b/src/Haskoin/Store/Data.hs
@@ -102,6 +102,7 @@
     , binfoUnspentToJSON
     , binfoUnspentToEncoding
     , binfoUnspentParseJSON
+    , binfoHexValue
     , BinfoUnspents(..)
     , binfoUnspentsToJSON
     , binfoUnspentsToEncoding
@@ -1803,6 +1804,14 @@
         getBinfoWalletTotalSent <- o .: "total_sent"
         return BinfoWallet {..}
 
+binfoHexValue :: Word64 -> Text
+binfoHexValue w64 =
+    let bs = B.dropWhile (== 0x00) (S.encode w64)
+    in encodeHex $
+       if B.null bs || B.head bs `testBit` 7
+       then B.cons 0x00 bs
+       else bs
+
 data BinfoUnspent
     = BinfoUnspent
       { getBinfoUnspentHash          :: !TxHash
@@ -1822,7 +1831,7 @@
         , "tx_output_n" .= getBinfoUnspentOutputIndex
         , "script" .= encodeHex getBinfoUnspentScript
         , "value" .= getBinfoUnspentValue
-        , "value_hex" .= (printf "%x" getBinfoUnspentValue :: String)
+        , "value_hex" .= binfoHexValue getBinfoUnspentValue
         , "confirmations" .= getBinfoUnspentConfirmations
         , "tx_index" .= getBinfoUnspentTxIndex
         ] <>
@@ -1838,7 +1847,7 @@
         "tx_output_n" .= getBinfoUnspentOutputIndex <>
         "script" .= encodeHex getBinfoUnspentScript <>
         "value" .= getBinfoUnspentValue <>
-        "value_hex" .= (printf "%x" getBinfoUnspentValue :: String) <>
+        "value_hex" .= binfoHexValue getBinfoUnspentValue <>
         "confirmations" .= getBinfoUnspentConfirmations <>
         "tx_index" .= getBinfoUnspentTxIndex <>
         maybe mempty (("xpub" `pair`) . binfoXPubPathToEncoding net) getBinfoUnspentXPub