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Autonomous Agent for Running a Smart Contract
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Smart Contract

An autonomous agent that operates on behalf of the issuer to recognize and enforce some or all the terms and conditions of the specified contract. At a minimum, the Smart Contract operates within the bounds of the Tokenized Protocol on the Bitcoin SV (BSV) network. The Smart Contract is written in Go and is intended to offer all the basic functionality required to issue, manage and exchange tokens, but it can also be used as the basis for much more complex smart contracts.

Usage Warning

This is a Beta release, with more changes likely before the final version. Do not use this in production.

Getting Started

Quick Start

If you're only ever going to run the binary and are not interested in working with the source code.

go get

Build from Source

To build the project from source, clone the GitHub repo and in a command line terminal.

mkdir -p $GOPATH/src/
cd $GOPATH/src/
git clone
cd smart-contract

Navigate to the root directory and run:


Project Components


  • cmd/smartcontract - Command line interface
  • cmd/smartcontractd - Smart Contract node daemon


  • pkg/protocol - Tokenized protocol message definitions.
  • pkg/spvnode - Connects to a trusted node as a peer via the public interface.
  • pkg/rpcnode - Connects to a trusted node via the RPC interface.
  • platform/inspector - Looks at transaction objects, converts them to a special transaction type (inspector.Transaction / itx) used throughout the app.
  • pkg/txbuilder - Generic BCH library for performing bitcoin related tasks, mainly around tx building.
  • pkg/storage - Storage engine, supporting S3 and local filesystem.
  • pkg/txscript - Bitcoin signature library.
  • pkg/wire - Bitcoin protocol message definitions.


Configuration is supplied via environment variables. See the example file that would export environment variables on Linux and macOS.

Make a copy the example file, and edit the values to suit. The file can be placed anywhere if you prefer.

cp conf/dev.env.example ~/.contract/acme.env

The following configuration values are needed:

Contract config
  • OPERATOR_NAME the name of the operator of the smart contract. Eg: ACME Corporation
  • FEE_ADDRESS public address to earn fees upon every action
  • FEE_VALUE the cost in satoshis to perform an action (<2000 at this stage)
Node config
  • NODE_ADDRESS hostname or IP address for a public node
  • NODE_USER_AGENT the user agent to provide when connecting to the public node
  • RPC_HOST hostname or IP address for a private node (RPC)
  • RPC_USERNAME username for RPC authentication
  • RPC_PASSWORD password for RPC authentication
  • PRIV_KEY private key (WIF) used by the smart contract
Contract storage
  • CONTRACT_STORAGE_REGION S3 region for data storage
  • CONTRACT_STORAGE_ACCESS_KEY S3 access key for data storage
  • CONTRACT_STORAGE_SECRET S3 secret for data storage
  • CONTRACT_STORAGE_BUCKET bucket for data storage, use standalone for local filesystem
  • CONTRACT_STORAGE_ROOT root directory for storage
Node storage
  • NODE_STORAGE_REGION S3 region for data storage
  • NODE_STORAGE_ACCESS_KEY S3 access key for data storage
  • NODE_STORAGE_SECRET S3 secret for data storage
  • NODE_STORAGE_BUCKET bucket for data storage, use standalone for local filesystem
  • NODE_STORAGE_ROOT root directory for storage


This example shows the config file containing the environment variables residing at ./conf/dev.env.example:

source ./conf/dev.env.example && make run


The Smart Contract requires RPC access to a full bitcoin node, such as Bitcoin SV. Once installed and syncronised with the BSV network, ensure that RPC is enabled by modifying the bitcoin.conf file.

# bitcoin.conf

Running unit tests

To perform unit tests run:

make test


See the deploy directory for information on how to deploy the smart contract.


Copyright 2018 nChain Holdings Limited.

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