diff --git a/src/private/casting.nim b/src/private/casting.nim
deleted file mode 100644
index 80651eb..0000000
--- a/src/private/casting.nim
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright (c) 2018 Status Research & Development GmbH
-# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
-
-import ttmath, keccak_tiny, nimsha2
-
-# We can't use Nim cast :/ to avoid copy
-
-proc toUint256*[T: Hash[256]|array[32, byte|char]](hash: T): UInt256 =
-  copyMem(addr result, unsafeAddr hash, 32)
-
-proc toByteArray*(num: UInt256): array[32, byte] =
-  copyMem(addr result, unsafeAddr num, 32)
\ No newline at end of file
diff --git a/src/private/hex.nim b/src/private/hex.nim
deleted file mode 100644
index c77a096..0000000
--- a/src/private/hex.nim
+++ /dev/null
@@ -1,48 +0,0 @@
-# Copyright (c) 2018 Status Research & Development GmbH
-# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
-
-import ttmath, strutils, ./casting
-
-proc readHexChar(c: char): int =
-  case c
-  of '0'..'9': result = ord(c) - ord('0')
-  of 'a'..'f': result = ord(c) - ord('a') + 10
-  of 'A'..'F': result = ord(c) - ord('A') + 10
-  else:
-    raise newException(ValueError, $c & "is not a hexademical character")
-
-proc hexToByteArray*[N: static[int]](hexStr: string): array[N, byte] {.noSideEffect.}=
-  var i = 0
-  if hexStr[i] == '0' and (hexStr[i+1] == 'x' or hexStr[i+1] == 'X'):
-    # Ignore 0x and OX
-    inc(i, 2)
-  assert hexStr.len - i == 2*N
-
-  while i < N:
-    result[i] = byte(readHexChar(hexStr[2*i]) shl 4 or readHexChar(hexStr[2*i+1]))
-    inc(i)
-
-proc hexToUInt256*(hexStr: string): UInt256 {.noSideEffect.}=
-  const N = 32
-
-  var i = 0
-  if hexStr[i] == '0' and (hexStr[i+1] == 'x' or hexStr[i+1] == 'X'):
-    # Ignore 0x and OX
-    inc(i, 2)
-  assert hexStr.len - i == 2*N
-
-  while i < 2*N:
-    result = result shl 4 or readHexChar(hexStr[i]).uint.u256
-    inc(i)
-
-proc toHex*(n: UInt256): string =
-  var rem = n # reminder to encode
-
-  const
-    N = 32 # nb of bytes in n
-    hexChars = "0123456789abcdef"
-
-  result = newString(2*N)
-  for i in countdown(2*N - 1, 0):
-    result[i] = hexChars[(rem and 0xF.u256).getUInt.int]
-    rem = rem shr 4
\ No newline at end of file