<pre>
  BIP: 102
  Title: Block size increase to 2MB
  Author: Jeff Garzik <jgarzik@gmail.com>
  Status: Draft
  Type: Standards Track
  Created: 2015-06-23
</pre>

==Abstract==

Simple, one-time increase in total amount of transaction data permitted in a block from 1MB to 2MB.

==Motivation==

# Enable network growth.
# Continue current economic policy of low fee pressure on average.
# Exercise network upgrade procedure.

==Specification==

# Maximum block size permitted to be valid is 1MB.
# Increase this maximum to 2MB as soon as 75% of the last 1,000 blocks have signaled support.
# Increase maximum block sigops by similar factor, preserving SIZE/50 formula.

==Backward compatibility==

Older clients are not compatible with this change.  The first block exceeding 1,000,000 bytes will partition older clients off the new network.

==Discussion==

In the short term, an increase is needed to continue to facilitate
network growth, and buy time for more comprehensive solutions to be
developed.  This continues the current economic policies with regards to
fees, matching market expectations and preventing market disruption.

In the long term, continued direct management of this limit is a moral hazard that clouds free market input and prevents a healthy fee market from developing.  This area of code should be transitioned away from direct management.

==Implementation==

https://github.com/jgarzik/bitcoin/tree/2015_2mb_blocksize