Scala-based Ethereum Node Client

The EVM Client
for Scalable Custody Infrastructure

Fukuii is an Ethereum-compatible node client built in Scala, optimized for enterprise custody settlement operations. Run your own network infrastructure with a focus on settlement reliability.

Read the Docs View on GitHub

What is Fukuii?

An Ethereum node client that fits into your custody stack

Fukuii is a node client—the software that connects to and participates in Ethereum-compatible networks. It processes transactions, maintains blockchain state, and exposes JSON-RPC APIs. Built on the proven Mantis codebase in Scala, Fukuii is designed to serve as reliable infrastructure within larger enterprise custody programs, not as a standalone custody solution.

Primary Focus

Optimized for Settlement

While a node client supports all aspects of blockchain interaction, Fukuii is particularly tuned for settlement-critical workloads in custody environments.

Why Settlement Matters

In digital asset custody, settlement is the moment of truth—when assets actually move between parties with cryptographic finality. A reliable node client is essential infrastructure for processing these transactions with confidence.

What Fukuii Provides

Fukuii gives your custody infrastructure a stable, well-tested connection to EVM networks. It handles block synchronization, transaction propagation, state management, and RPC services—the foundational layer that your custody applications build upon.

Enterprise Configuration

Deploy on public networks like Ethereum Classic, or run private/permissioned chains with the enterprise modifier. Fukuii includes configuration presets for isolated networks with disabled external discovery and compliance-aware defaults.

Peer

Fukuii

Custody Context

Part of a Larger Picture

Enterprise custody programs typically require capabilities across three areas. Fukuii provides the network infrastructure layer, particularly supporting settlement operations.

Safekeeping

Key management, multi-signature authorization, HSM integration, and secure storage of digital assets.

Requires dedicated key management systems and secure enclaves beyond the node client.

Settlement

Transaction processing, block confirmation, state finality, and network participation for moving assets reliably.

Fukuii provides the node infrastructure for settlement operations.

Fukuii Focus

Reporting

Audit trails, regulatory compliance, transaction history, and asset provenance tracking.

Built on data from the node, but requires additional tooling for compliance workflows.

Node Features

Built for Reliability

Fukuii inherits the battle-tested Mantis architecture while adding enterprise-focused configuration options.

100% Scala

Functional programming with strong type safety, immutability guarantees, and formal verification potential for critical infrastructure.

EVM Compatible

Full support for modern EVM hard forks. Deploy to Ethereum Classic mainnet, Mordor testnet, or private enterprise networks.

Enterprise Mode

Dedicated configuration for private/permissioned networks with disabled external discovery and compliance-aware defaults.

JSON-RPC API

Standard Ethereum JSON-RPC interface for integration with existing tooling, wallets, and custody applications.

Fast Sync

Rapid synchronization options including fast sync and bootstrap databases for quick node deployment.

Terminal UI

Optional TUI mode for real-time monitoring of node status, peers, sync progress, and network activity.

Getting Started

Run Fukuii

Fukuii uses SBT for building and provides simple launchers for different network configurations.

Clone and Build

Clone the repository and build with SBT. Requires JDK 11+ and SBT installed on your system.

Choose Your Network

Launch on ETC mainnet, Mordor testnet, or configure a private enterprise network with the enterprise modifier.

Connect Your Stack

Use the JSON-RPC API to integrate Fukuii with your custody applications, monitoring tools, and transaction systems.

Read the Docs

Full documentation at docs.fukuii.com covers configuration, deployment runbooks, and API reference.

# Clone the repository
git clone https://github.com/chippr-robotics/fukuii.git
cd fukuii

# Build with SBT
sbt compile

# Launch on ETC mainnet
./bin/fukuii etc

# Launch on Mordor testnet
./bin/fukuii mordor

# Enterprise mode for private networks
./bin/fukuii enterprise pottery

# With terminal UI
./bin/fukuii enterprise --tui

# Custom configuration
./bin/fukuii enterprise \
  -Dconfig.file=custom.conf

The EVM Client for Scalable Custody Infrastructure