As active contributors to Bitcoin, we share this letter to communicate our plan of action related to technical consensus and Bitcoin scalability.

Bitcoin is many things to many people. However, the development and maintenance of Bitcoin is a human endeavor. Satoshi sought review and cooperation, and the subsequent work by Bitcoin’s developers has made the system more secure and orders of magnitude faster. The Bitcoin developer community is dedicated to the future of Bitcoin, looks after the health of the network, strives for the highest standards of performance, and works to keep Bitcoin secure on behalf of everyone.

We’re committed to Bitcoin and responsive to the needs of the community. For the past five years, we’ve written code and managed over 50 Bitcoin releases and reviewed more than 45 formal proposals to improve Bitcoin’s performance, security, and scalability. Technical discussions, while heated at times, are always focused on improving Bitcoin.

Much work has already been done in this area, from substantial improvements in CPU bottlenecks, memory usage, network efficiency, and initial block download times, to algorithmic scaling in general. However, a number of key challenges still remain, each with many significant considerations and tradeoffs to evaluate. We have worked on Bitcoin scaling for years while safeguarding the network’s core features of decentralization, security, and permissionless innovation. We’re committed to ensuring the largest possible number of users benefit from Bitcoin, without eroding these fundamental values.

There will be controversy from time to time, but Bitcoin is a security-critical system with billions of dollars of users’ assets that a mistake could compromise. To mitigate potential existential risks, it behooves us all to take the time to evaluate proposals that have been put forward and agree on the best solutions via the consensus-building process.

In the upcoming months, two open workshops will bring the community together to explore these issues. The first Scaling Bitcoin workshop will be in Montreal on September 12-13. The second workshop is planned for December 6-7 and will be hosted in Hong Kong to be more inclusive of Bitcoin’s global user base.

We ask the community to not prejudge and instead work collaboratively to reach the best outcome through the existing process and the supporting workshops. It’s great to already see broad excitement for the event and the high concentration of technical participants attending.

We’re confident that by working together we can agree on the best course of action. We believe this is the way forward and reinforces the existing review process that has served the Bitcoin development community (and Bitcoin in general) well to date.

We welcome your participation as we continue our efforts to bring Bitcoin into the future.


(List of Technical contributors who support this letter)

Wladimir J. van der Laan

Pieter Wuille

Cory Fields

Luke Dashjr

Jonas Schnelli

Jorge Timón

Greg Maxwell

Eric Voskuil

Amir Taaki

Dave Collins

Michael Ford

Peter Todd

Phillip Mienk

Suhas Daftuar

R E Broadley

Eric Lombrozo

Daniel Kraft

Chris Moore

Alex Morcos


Warren Togami

Mark Friedenbach

Ross Nicoll

Pavel Janík

Josh Lehan

Andrew Poelstra

Christian Decker

Bryan Bishop

Benedict Chan


William Swanson

Charlie Lee

Jeremy Rubin

Esteban Ordano

Manuel Araoz

Ruben de Vries

Further signatures can be found at

This letter was originally published in Bitcoin Magazine on 1st September 2015 at