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Arweave Server

This is the repository for the official Erlang implementation of the Arweave protocol and a gateway implementation.

Arweave is a distributed, cryptographically verified permanent archive built on a cryptocurrency that aims to, for the first time, provide feasible data permanence. By leveraging our novel Blockweave datastructure, data is stored in a decentralised, peer-to-peer manner where miners are incentivised to store rare data.

Getting Started

Download and extract the latest archive for your platform on the release page, then run the included bin/start script to get started.

For more information, refer to the mining guide.

Building from source


  • OpenSSL 1.1.1+
  • OpenSSL development headers
  • GCC or Clang (GCC 8+ recommended)
  • Erlang OTP v24, with OpenSSL support
  • GNU Make
  • CMake (CMake version > 3.10.0)
  • SQLite3 headers (libsqlite3-dev on Ubuntu)
  • GNU MP (libgmp-dev on Ubuntu)

To install the dependencies on Ubuntu 22 (recommended), run:

sudo apt install libssl-dev libgmp-dev libsqlite3-dev make cmake gcc g++

On some systems you might need to install libncurses-dev.

Download the repo:

$ git clone --recursive
$ cd arweave

Increase the open file limits.

Run in the development mode:

./arweave-server peer peer peer peer peer

Make a production build:

$ ./rebar3 as prod tar

You will then find the gzipped tarball at _build/prod/rel/arweave/arweave-x.y.z.tar.gz.


To make a testnet build, run:

$ ./rebar3 as testnet tar

The tarball is created at _build/testnet/rel/arweave/arweave-x.y.z.tar.gz.

You can join the public testnet now:

./bin/start peer peer peer

We recommend you do not use your mainnet mining address on testnet. Also, do not join the testnet from the mainnet machine.

Starting New Weave

To start a new weave, create a new data directory

mkdir -p localnet_data_dir

, create a wallet:

./bin/create-wallet localnet_data_dir

, and run:

$ ./bin/start-localnet init data_dir <your-data-dir> mining_addr <your-mining-addr>
storage_module 0,<your-mining-addr> mine

The given address (if none is specified, one will be generated for you) will be assigned 1000_000_000_000 AR in the new weave.

The network name will be arweave.localnet. You can not start the same node again with the init option unless you clean the data directory - you need to either restart with the start_from_block_index option or specify a peer from the same Arweave network via peer <peer>. Note that the state is only persisted every 50 blocks so if you restart the node without peers via start_from_block_index before reaching the height 50, it will go back to the genesis block.

As with mainnet peers, each peer must be run in its own physical or virtual environment (e.g. on its own machine or in its own container or virtual machine). If you try to run two nodes within the same environment you will get an error like Protocol 'inet_tcp': the name arweave@ seems to be in use by another Erlang node

When POST'ing transactions to your localnet make sure to include the X-Network: arweave.localnet header. If the header is omitted, the mainnet network will be assumed and the request will fail.


Make sure to have the build requirements installed.

Clone the repo and initialize the Git submodules:

$ git clone --recursive

Running the tests

$ bin/test

Running a shell

$ bin/shell

bin/test and bin/shell launch two connected Erlang VMs in distributed mode. The master VM runs an HTTP server on the port 1984. The slave VM uses the port 1983. The data folders are data_test_master and data_test_slave respectively. The tests that do not depend on two VMs are run against the master VM.

Run a specific test (the shell offers autocompletion):

(master@> eunit:test(ar_fork_recovery_tests:height_plus_one_fork_recovery_test_()).

If it fails, the nodes keep running so you can inspect them through Erlang shell or HTTP API. The logs from both nodes are collected in logs/. They are rotated so you probably want to consult the latest modified master@* and slave@* files first - ls -lat logs/.

See for more information.


You can find documentation regarding our HTTP interface here.


If you have questions or comments about Arweave you can get in touch by finding us on Twitter, Reddit, Discord or by emailing us at

For more information about the Arweave project visit or have a look at our yellow paper.


The Arweave project is released under GNU General Public License v2.0. See LICENSE for full license conditions.

Arweave Bug Bounty Program

Arweave core team has initiated an Arweave bug bounty program, with a maximum bounty of up to USD 1,000,000. The program is focused on discovering potential technical vulnerabilities and strengthening Arweave core protocol security.

The Arweave core team puts security as its top priority and has dedicated resources to ensure high incentives to attract the community at large to evaluate and safeguard the ecosystem. Whilst building Arweave, the team has engaged with industry-leading cybersecurity audit firms specializing in Blockchain Security to help secure the codebase of Arweave protocol.

We encourage developers, whitehat hackers to participate, evaluate the code base and hunt for bugs, especially on issues that could potentially put users’ funds or data at risk. In exchange for a responsibly disclosed bug, the bug bounty program will reward up to USD 1,000,000 (paid in $AR tokens) based on the vulnerability severity level, at the discretion of the Arweave team. Please email us at to get in touch.