diff --git a/Cargo.lock b/Cargo.lock
index 9c225dbbe..b8a92fc3d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -209,6 +209,7 @@ dependencies = [
  "ethsync 0.9.99",
  "jsonrpc-core 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-http-server 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_codegen 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ethcore/src/ethereum/ethash.rs b/ethcore/src/ethereum/ethash.rs
index d26a7e2af..6dabe558f 100644
--- a/ethcore/src/ethereum/ethash.rs
+++ b/ethcore/src/ethereum/ethash.rs
@@ -249,6 +249,11 @@ impl Ethash {
 		x!(U256::from((U512::one() << 256) / x!(difficulty)))
 	}
 
+	/// Given the `block_number`, determine the seed hash for Ethash.
+	pub fn get_seedhash(number: BlockNumber) -> H256 {
+		Self::from_ethash(ethash::get_seedhash(number))
+	}
+
 	fn to_ethash(hash: H256) -> EH256 {
 		unsafe { mem::transmute(hash) }
 	}
@@ -259,12 +264,17 @@ impl Ethash {
 }
 
 impl Header {
+	/// Get the none field of the header.
 	pub fn nonce(&self) -> H64 {
 		decode(&self.seal()[1])
 	}
+
+	/// Get the mix hash field of the header.
 	pub fn mix_hash(&self) -> H256 {
 		decode(&self.seal()[0])
 	}
+
+	/// Set the nonce and mix hash fields of the header.
 	pub fn set_nonce_and_mix_hash(&mut self, nonce: &H64, mix_hash: &H256) {
 		self.seal = vec![encode(mix_hash).to_vec(), encode(nonce).to_vec()];
 	}
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index c38684643..086fb19c1 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -9,6 +9,7 @@ build = "build.rs"
 [lib]
 
 [dependencies]
+log = "0.3"
 serde = "0.7.0"
 serde_json = "0.7.0"
 jsonrpc-core = "1.2"
diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index 1b5c4739c..b26f38440 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -25,8 +25,7 @@ use util::rlp::encode;
 use ethcore::client::*;
 use ethcore::block::{IsBlock};
 use ethcore::views::*;
-extern crate ethash;
-use self::ethash::get_seedhash;
+//#[macro_use] extern crate log;
 use ethcore::ethereum::Ethash;
 use ethcore::ethereum::denominations::shannon;
 use v1::traits::{Eth, EthFilter};
@@ -216,6 +215,7 @@ impl Eth for EthClient {
 	}
 
 	fn work(&self, params: Params) -> Result<Value, Error> {
+		println!("Work wanted: {:?}", params);
 		match params {
 			Params::None => {
 				let c = take_weak!(self.client);
@@ -224,7 +224,7 @@ impl Eth for EthClient {
 					Some(ref b) => {
 						let pow_hash = b.hash();
 						let target = Ethash::difficulty_to_boundary(b.block().header().difficulty());
-						let seed_hash = get_seedhash(b.block().header().number());
+						let seed_hash = Ethash::get_seedhash(b.block().header().number());
 						to_value(&(pow_hash, seed_hash, target))
 					}
 					_ => Err(Error::invalid_params())
@@ -235,6 +235,7 @@ impl Eth for EthClient {
 	}
 
 	fn submit_work(&self, params: Params) -> Result<Value, Error> {
+		println!("Work submission: {:?}", params);
 		from_params::<(H64, H256, H256)>(params).and_then(|(nonce, pow_hash, mix_hash)| {
 			let c = take_weak!(self.client);
 			let seal = vec![encode(&mix_hash).to_vec(), encode(&nonce).to_vec()];
@@ -242,7 +243,13 @@ impl Eth for EthClient {
 		})
 	}
 
-//	fn submit_hashrate(&self, _: Params) -> Result<Value, Error> { rpc_unimplemented!() }
+	fn submit_hashrate(&self, params: Params) -> Result<Value, Error> {
+		println!("Hashrate submission: {:?}", params);
+		from_params::<(Index, H256)>(params).and_then(|(rate, id)| {
+			println!("Miner {} reports a hash rate of {} H/s", id, rate.value());
+			to_value(&true)
+		})
+	}
 }
 
 /// Eth filter rpc implementation.