diff --git a/README.md b/README.md
index 929d9df7..ed971404 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,11 @@ Find an area you can help with and do it. Open source is about collaboration and
 
 Additional tests are rewarded with an immense amount of positive karma. So is documentation.
 
-Find us on Gitter: https://gitter.im/grin_community/Lobby
+Find us:
+
+* IRC: Freenode #MimbleWimble
+* Mailing list: TBD
+
 
 ## Philosophy
 
diff --git a/core/src/core/block.rs b/core/src/core/block.rs
index 563d9675..b7826ac1 100644
--- a/core/src/core/block.rs
+++ b/core/src/core/block.rs
@@ -23,9 +23,8 @@ use std::collections::HashSet;
 use core::Committed;
 use core::{Input, Output, Proof, TxProof, Transaction};
 use core::transaction::merkle_inputs_outputs;
-use core::{PROOFSIZE, REWARD};
+use consensus::{PROOFSIZE, REWARD, MAX_IN_OUT_LEN};
 use core::hash::{Hash, Hashed, ZERO_HASH};
-use core::transaction::MAX_IN_OUT_LEN;
 use ser::{self, Readable, Reader, Writeable, Writer};
 
 /// Block header, fairly standard compared to other blockchains.
diff --git a/core/src/core/mod.rs b/core/src/core/mod.rs
index 0340493b..dbb79fff 100644
--- a/core/src/core/mod.rs
+++ b/core/src/core/mod.rs
@@ -19,25 +19,17 @@ pub mod hash;
 pub mod transaction;
 #[allow(dead_code)]
 
-pub use self::block::{Block, BlockHeader};
-pub use self::transaction::{Transaction, Input, Output, TxProof};
-use self::hash::{Hash, Hashed, ZERO_HASH};
-use ser::{Writeable, Writer, Error};
-
 use std::fmt;
 use std::cmp::Ordering;
 
 use secp::{self, Secp256k1};
 use secp::pedersen::*;
 
-/// The block subsidy amount
-pub const REWARD: u64 = 1_000_000_000;
-
-/// Block interval, in seconds
-pub const BLOCK_TIME_SEC: u8 = 15;
-
-/// Cuckoo-cycle proof size (cycle length)
-pub const PROOFSIZE: usize = 42;
+use consensus::PROOFSIZE;
+pub use self::block::{Block, BlockHeader};
+pub use self::transaction::{Transaction, Input, Output, TxProof};
+use self::hash::{Hash, Hashed, ZERO_HASH};
+use ser::{Writeable, Writer, Error};
 
 /// Implemented by types that hold inputs and outputs including Pedersen
 /// commitments. Handles the collection of the commitments as well as their
diff --git a/core/src/core/transaction.rs b/core/src/core/transaction.rs
index 6d2baf49..91852e16 100644
--- a/core/src/core/transaction.rs
+++ b/core/src/core/transaction.rs
@@ -14,21 +14,17 @@
 
 //! Transactions
 
-use core::Committed;
-use core::MerkleRow;
-use core::hash::{Hash, Hashed};
-
 use byteorder::{ByteOrder, BigEndian};
 use secp::{self, Secp256k1, Message, Signature};
 use secp::key::SecretKey;
 use secp::pedersen::{RangeProof, Commitment};
 
+use consensus::MAX_IN_OUT_LEN;
+use core::Committed;
+use core::MerkleRow;
+use core::hash::{Hash, Hashed};
 use ser::{self, Reader, Writer, Readable, Writeable};
 
-/// The maximum number of inputs or outputs a transaction may have
-/// and be deserializable.
-pub const MAX_IN_OUT_LEN: u64 = 50000;
-
 /// A proof that a transaction sums to zero. Includes both the transaction's
 /// Pedersen commitment and the signature, that guarantees that the commitments
 /// amount to zero. The signature signs the fee, which is retained for
diff --git a/core/src/lib.rs b/core/src/lib.rs
index aef09db2..ae4ccdaf 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -31,6 +31,7 @@ extern crate tiny_keccak;
 #[macro_use]
 pub mod macros;
 
+pub mod consensus;
 pub mod core;
 pub mod genesis;
 pub mod pow;
diff --git a/core/src/pow/cuckoo.rs b/core/src/pow/cuckoo.rs
index 544aef68..1673c36e 100644
--- a/core/src/pow/cuckoo.rs
+++ b/core/src/pow/cuckoo.rs
@@ -23,7 +23,8 @@ use std::cmp;
 use crypto::digest::Digest;
 use crypto::sha2::Sha256;
 
-use core::{Proof, PROOFSIZE};
+use consensus::PROOFSIZE;
+use core::Proof;
 use pow::siphash::siphash24;
 
 const MAXPATHLEN: usize = 8192;
diff --git a/core/src/pow/mod.rs b/core/src/pow/mod.rs
index 5e339597..936a0edd 100644
--- a/core/src/pow/mod.rs
+++ b/core/src/pow/mod.rs
@@ -27,28 +27,14 @@ mod cuckoo;
 
 use time;
 
-use core::{Block, Proof, PROOFSIZE};
+use consensus::{SIZESHIFT, EASINESS};
+use core::{Block, Proof};
 use core::hash::{Hash, Hashed};
 use pow::cuckoo::{Cuckoo, Miner, Error};
 
 use ser;
 use ser::{Writeable, Writer};
 
-/// Default Cuckoo Cycle size shift used is 28. We may decide to increase it.
-/// when difficuty increases.
-const SIZESHIFT: u32 = 28;
-
-/// Default Cuckoo Cycle easiness, high enough to have good likeliness to find
-/// a solution.
-const EASINESS: u32 = 50;
-
-/// Max target hash, lowest difficulty
-pub const MAX_TARGET: [u32; PROOFSIZE] =
-	[0xfff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff];
-
 /// Subset of a block header that goes into hashing for proof of work.
 /// Basically the whole thing minus the PoW solution itself and the total
 /// difficulty (yet unknown). We also add the count of every variable length
@@ -166,6 +152,7 @@ fn pow_size(b: &Block, target: Proof, sizeshift: u32) -> Result<(Proof, u64), Er
 #[cfg(test)]
 mod test {
 	use super::*;
+	use consensus::MAX_TARGET;
 	use core::Proof;
 	use genesis;