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💾⏰💪 Thanks for your interest in this open source project. This repo is the go implementation of the Spacemesh p2p full node software.

Spacemesh is a decentralized blockchain computer using a new race-free consensus protocol that doesn't involve energy-wasteful proof of work.

We aim to create a secure and scalable decentralized computer formed by a large number of desktop PCs at home.

We are designing and coding a modern blockchain platform from the ground up for scale, security and speed based on the learnings of the achievements and mistakes of previous projects in this space.

To learn more about Spacemesh head over to

To learn more about the Spacemesh protocol watch this video.


Spacemesh is designed to create a decentralized blockchain smart contracts computer and a cryptocurrency that is formed by connecting the home PCs of people from around the world into one virtual computer without incurring massive energy waste and mining pools issues that are inherent in other blockchain computers, and provide a provably-secure and incentive-compatible smart contracts execution environment.

Spacemesh is designed to be ASIC-resistant and in a way that doesn’t give an unfair advantage to rich parties who can afford setting up dedicated computers on the network. We achieve this by using a novel consensus protocol and optimize the software to be most effectively be used on home PCs that are also used for interactive apps.

What is this good for?

Provide dapp and app developers with a robust way to add value exchange and other value related features to their apps at scale. Our goal is to create a truly decentralized cryptocurrency that fulfills the original vision behind bitcoin to become a secure trustless store of value as well as a transactional currency with extremely low transaction fees.

Target Users

go-spacemesh is designed to be installed and operated on users' home PCs to form one decentralized computer. It is going to be distributed in the Spacemesh App but people can also build and run it from source code.

Project Status

We are working hard towards our first major milestone - a public permissionless testnet running the Spacemesh consensus protocol.


Thank you for considering to contribute to the go-spacemesh open source project!

We welcome contributions large and small and we actively accept contributions.

Diggin' Deeper

Please read the Spacemesh full FAQ.

go-spacemesh Architecture

High Level Design

Client Software Architecture


git clone

-- or --

Fork the project from

Since the project uses Go 1.11's Modules it is best to place the code outside your $GOPATH. Read this for alternatives.

Setting Up Local Environment

Install Go 1.11 or later for your platform, if you haven't already.

Ensure that $GOPATH is set correctly and that the $GOPATH/bin directory appears in $PATH.

Before building we need to install protoc (ProtoBuf compiler) and some tools required to generate ProtoBufs. Do this by running:

make install

This will invoke which supports Linux and MacOS. On other platforms it should be straightforward to follow the steps in this script manually.


To build go-spacemesh for your current system architecture, from the project root directory, use:

make build

This will (re-)generate protobuf files and build the go-spacemesh binary, saving it in the build/ directory.

To build a binary for a specific architecture directory use:

make darwin | linux | windows

Platform-specific binaries are saved to the /build directory.


go-spacemesh is p2p software which is designed to form a decentralized network by connecting to other instances of go-spacemesh running on remote computers.

To run go-spacemesh you need to specify the parameters shared between all instances on a specific network.

You specify these parameters by providing go-spacemesh with a toml config file. Other CLI flags control local node behavior and override default values.

Joining a Testnet (without mining)
  1. Build go-spacemesh from source code.
  2. Obtain the testnet's toml config file.
  3. Start go-spacemesh with the following arguments:
./go-spacemesh --grpc-server --json-server --tcp-port [a_port] --config [tomlFileLocation] -d [nodeDataFilesPath]

Assuming tn1.toml is a testnet config file saved in the same directory as go-spacemesh, use the following command to join the testnet. The data folder will be created in the same directory as go-spacemesh. The node will use TCP port 7152 and UDP port 7152 for p2p connections:

./go-spacemesh --grpc-server --json-server --tcp-port 7152 --config ./[tn1.toml]( -d ./sm_data
  1. Build the CLI Wallet from source code and run it:

  2. Use the CLI Wallet commands to setup accounts, start smeshing and execute transactions.

Joining a Testnet (with mining)
  1. Run go-spacemesh to join a testnet without mining (see above).
  2. Run the CLI Wallet to create a coinbase account. Save your coinbase account public address - you'll need it later.
  3. Stop go-spacemesh and start it with the following params:
./go-spacemesh --grpc-server --json-server --tcp-port [a_port] --config [tomlFileLocation] -d [nodeDataFilesPath] --coinbase [coinbase_account] --start-mining --post-datadir [dir_for_post_data]
./go-spacemesh --grpc-server --json-server --tcp-port 7152 --config ./tn1.toml -d ./sm_data --coinbase 0x36168c60e06abbb4f5df6d1dd6a1b15655d71e75 --start-mining --post-datadir ./post_data
  1. Use the CLI wallet to check your coinbase account balance and to transact
Joining Spacemesh 0.1 (TweedleDee) Testnet
  1. Build go-spacemesh source code from this github release: go-spacemesh 0.1.9.
  2. Follow the instructions on how to join a testnet with mining (above) and use Testnet 0.1 (TweedleDee) Config File as your node's config file.


NOTE: if tests are hanging try running ulimit -n 400. some tests require that to work.

make test


make cover


A Dockerfile is included in the project allowing anyone to build and run a docker image:

docker build -t spacemesh .
docker run -d --name=spacemesh spacemesh


On windows you will need the following prerequisites:

  • Powershell - included by in Windows by default since Windows 7 and Windows Server 2008 R2
  • Git for Windows - after installation remove C:\Program Files\Git\bin from System PATH and add C:\Program Files\Git\cmd to System PATH
  • Make - after installation add C:\Program Files (x86)\GnuWin32\bin to System PATH

You can then run the command make install followed by make build as on unix based systems.

Running a Local Testnet

  • You can run a local Spacemesh Testent with 6 full nodes, 6 user accounts, and 1 POET support service on your computer using docker.
  • The local testnet full nodes are built from this repo.
  • This is a great way to get a feel for the protocol and the platform and to start hacking on Spacemesh.
  • Follow the steps in our Local Testnet Guide
Next Steps...

Got Questions?

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go-spacemesh is a golang implementation of the Spacemesh node. See -

Source Files


Path Synopsis
activation Package activation is responsible for creating activation transactions and running the mining flow, coordinating PoST building, sending proofs to PoET and building NIPoST structs.
api Package api provides the local go-spacemesh API endpoints.
api/config Package config provides configuration for GRPC and HTTP api servers
cmd Package cmd is the base package for various sets of builds and executables created from go-spacemesh
cmd/hare package hare is the tester executable running instances of hare consensus algorithm
cmd/integration Package integration provides RPC testing harness for executing and interacting with full node
cmd/multi_node_sim package multi_node_sim is an implementation of a framework running multiple nodes in same executable with fast hare implementation.
cmd/node Package node contains the main executable for go-spacemesh node
cmd/p2p package p2p cmd is the main executable for running p2p tests and simulations
collector Package collector implements event collecting from pubsub
common/types Package types defines the types used by go-spacemesh consensus algorithms and structs
common/util Package util provides common utility functions.
config Package config contains go-spacemesh node configuration definitions
crypto Package crypto provides funcs and types used by other packages to perform crypto related ops
crypto/sha3 Package sha3 implements the SHA-3 fixed-output-length hash functions and the SHAKE variable-output-length hash functions defined by FIPS-202.
database Package database defines interfaces to key value type databases used by various components in go-spacemesh node
eligibility Package eligibility defines fixed size oracle used for node testing
events Package events defines events published by go-spacemsh node using nodes pubsub
filesystem Package filesystem provides functionality for interacting with directories and files in a cross-platform manner.
hare Package hare implements the Hare Protocol.
log Package log provides the both file and console (general) logging capabilities to spacemesh modules such as app and identity.
mesh Package mesh defines the main store point for all the block-mesh objects such as blocks, transactions and global state
metrics Package metrics defines telemetry primitives to be used across components.
miner Package miner is responsible for creating valid blocks that contain valid activation transactions and transactions
nattraversal Package nattraversal provides tools for acquiring ports on a Network Address Translator (NAT).
nattraversal/upnp Package upnp provides a simple and opinionated interface to UPnP-enabled routers, allowing users to forward ports and discover their external IP address.
p2p Package p2p provides a networking api for creating p2p protocols by enabling sending direct messages to a set of provided neighbors or broadcasting a message to all of them.
p2p/config Package config defines configuration used in the p2p package
p2p/connectionpool Package connectionpool functions as a connection cache that takes care of connecting and reusing connected sockets.
p2p/discovery Package discovery implements uses bitcoin-based addrbook to store network addresses and collects them by crawling the network using a simple protocol.
p2p/gossip Package gossip implements simple protocol to send new validated messages to all peers and ignore old or not valid messages.
p2p/metrics Package metrics defines metric reporting for the p2p component.
p2p/net Package net manages the accepting network connections/messages and routing the data upward for the protocols to consume.
p2p/net/wire/delimited Package delimited implements a reader and writer for simple streams of length-delimited byte records.
p2p/node Package node defines simple data structures to represent p2p node identities.
p2p/p2pcrypto Package p2pcrypto defines the cryptographic primitives used to communicate and identify in the p2p network, it uses go stdlib's NaCL box implementation.
p2p/server Package server is used to wrap the p2p services to define multiple req-res messages under one protocol.
p2p/service Package service defines basic interfaces to for protocols to consume p2p functionality.
p2p/version Package version includes methods to compare versions between nodes.
pendingtxs Package pendingtxs exposes the AccountPendingTxs type, which keeps track of transactions that haven't been applied to global state yet.
rlp Package rlp implements the RLP serialization format.
timesync Package timesync is used to check system time reliability by communicating with NTP time servers.
trie Package trie implements Merkle Patricia Tries.
turbohare Package turbohare is a component returning block ids for layer as seen by this miner, without running any consensus process