diff --git a/eth-rpc/server/cryptoutils.nim b/eth-rpc/server/cryptoutils.nim
new file mode 100644
index 0000000..c9b9713
--- /dev/null
+++ b/eth-rpc/server/cryptoutils.nim
@@ -0,0 +1,8 @@
+import nimcrypto
+
+proc k256*(data: string): string =
+  # do not convert, assume string is data
+  var k = sha3_256()
+  k.init
+  k.update(cast[ptr uint8](data[0].unsafeaddr), data.len.uint)
+  result = $finish(k)
diff --git a/eth-rpc/server/ethprocs.nim b/eth-rpc/server/ethprocs.nim
index 9bbbeca..629a42e 100644
--- a/eth-rpc/server/ethprocs.nim
+++ b/eth-rpc/server/ethprocs.nim
@@ -1,25 +1,28 @@
 import servertypes, json, asyncdispatch, rpcregistration
-import keccak_tiny
+import cryptoutils
 
 proc web3_clientVersion {.rpc.} =
   return %("Nimbus-RPC-Test")
 
 proc web3_sha3 {.rpc.} =
-  let
-    data = params.getStr
-    res = $sha3_256(data)
-  return %res
+  var data = params.getStr
+  let kres = k256(data)
+  return %kres
 
 proc net_version {.rpc.} =
-  discard
-
-proc net_peerCount {.rpc.} =
-  # TODO: Discovery integration
+  #[ See:
+    https://github.com/ethereum/interfaces/issues/6
+    https://github.com/ethereum/EIPs/issues/611
+  ]#
   discard
 
 proc net_listening {.rpc.} =
   return %"true"
 
+proc net_peerCount {.rpc.} =
+  # TODO: Discovery integration
+  discard
+
 proc eth_protocolVersion {.rpc.} =
   discard