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Introducting Spacemesh

Blockchain OS

Spacemesh is a blockchain operating system designed to run general-purpose smart contracts at web-scale.  It is powered by a novel consensus protocol that is secure, proof of work free and highly incentive-compatible.

Spacemesh is designed to create a highly-decentralized p2p blockchain computer formed by individuals from around the globe running Spacemesh on their desktop PCs at home.

Spacemesh is as a free open source software that aims to become a core Internet protocol for blockchain computation.

Spacemesh Highlights

Race Free

Fairly awards all participating honest nodes eliminating selfish mining and mining pools concerns and enabling a high degree of incentive compatibility


Proof of work free after a one-time initial setup phase where nodes commit space from their PC hard drives avoiding massive energy waste associated with legacy mining protocols


Designed to create a highly decentralized network formed by thousands of home desktop PCs. It is free of centralization concerns associated with proof-of-stake based protocols. Anyone can join the network, contribute CPU, storage and networking and earn token awards


Unique deep integration of a novel consensus protocol with highly-capable payment channels create a scalable transaction processing and smart contracts execution solution that is an order of magnitude better than pow powered network


Security is our top priority. All of our algorithms and protocols will have strong security, crypto economics and liveliness proofs. Our proofs will be fully published and peer reviewed and we will fund a bounty program to further enhance the project's securit

Open and Free

Spacemesh is a free open source software licensed under the MIT license. Our goals is  to create a vibrant and inclusive developers community for the project and make Spacemesh a core Internet protocol for blockchain consensus and computation. Join us

Spacemesh Consensus Protocol

We are building a new blockchain consensus protocol that replaces energy-wasteful proof of work (POW) mechanisms with proof of space time (POST) and the blockchain data structure with a mesh (a layered directed acyclic graph) to provide scalable, secure, theoretically-sound and race-free decentralized computation and transaction processing capabilities. The protocol does not require POW apart from a short initial setup phase.

Our protocols algorithmic and security work is lead by our chief scientists Prof. Tal Moran and Dr. Iddo Bentov, two of the world's leading consensus and blockchain researches and is based on their cutting-edge research in the field.

Under optimal conditions, the protocol involves nodes performing a one-time setup phase that involves commitment of hard-disk space after which they don't need to perform POW on an ongoing basis to participate in the network and earn block validation awards.

Our full technical white paper is in the works and will be published here soon. Some of the core ideas in our protocol include the following related research published by members of our team.

Rational Proofs of Space Time

Tortoise and Hares Consensus: the Meshcash Framework for Incentive-Compatible, Scalable Cryptocurrencies

Cryptocurrencies without Proof of Work

Publicly Verifiable Proofs of Sequential Work

Tortoise and Hares Consensus Protocol

Watch Spacemesh Chief Scientist Prof. Tal Moran gives an overview of the tortoise and hare consensus protocol at CESC2017 in Berkeley, CA 

Founding Team

We are a group of software developers, entrepreneurs, investors and cryptographers with a shared passion for building a secure and decentralized blockchain platform

Tomer Afek


Over 3 decades on both sides of the startup table. Helped founding Showbox.com, prior was the Co-Founder/CEO of ConvertMedia, a big data startup (acquired by Taboola). Prior spent 7 years as Investor at Evergreen VC, among Israel’s oldest and largest VCs, in charge of Internet & New-Media investments. Was also in the founding team of Sanctum Inc. a leader in web application security. Holds a B.Sc. in Economics and Computer Science (Cum Laude) from Tel-Aviv University. Profile

Rami Kasterstein


 Serves as Managing Partner at Scale-Up Venture Capital. He been involved as founder, private investor and executive in several startups. Has over 25 years of global Hi-Tech experience with several successful startup companies both as investor and as an executive. Holds a M.Sc. in Computer Science (Cum Laude) from the Weizmann Institute, and a B.Sc. in Mathematics and Computer Science (Cum Laude) from Tel-Aviv University. Profile

Prof. Tal Moran

chief scientist

A faculty member in the School of Computer Science at the Interdisciplinary Center Herzliya, which he joined in 2011. Previously he was a postdoctor research fellow at the Center for Research on Computation and Society at Harvard University,
Holds a PhD. from the Weizmann Institute of Science, advised by Moni Naor. Tal's research focuses on employing ideas and techniques from theoretical cryptography to design secure systems in the “real world”. He's also interested the foundations of cryptography and the theory of cryptography in general. Publications

 Dr. Iddo Bentov

chief scientist

A Postdoctoral researcher at Cornell University, and an author of several of academic papers on cryptography and cryptocurrency. He has been involved in the Bitcoin space since mid-2011. Also works on succinct zero-knowledge proofs at SCIPR Lab. Holds a Phd in Computer Science from the Technion, Israel Institute of Technology. Publications 

Aviv Eyal


A successful serial entrepreneur and a hands-on CTO. Passionate about building innovative online software platforms and p2p networks for  individual and social empowerment.
Co-founded Grouper Networks, a san-fran based online video sharing platform (acquired by Sony and rebraded Crackle.com) and served as VP, Technology, Sony. Holds a B.Sc. in Philosophy and Computer Science from Tel-Aviv University. Profile

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