Overview
Ethernal is a blockchain engineering company that builds, audits, and researches blockchain software for other projects. Teams hire it to write core network code, check their smart contracts (programs that run on a blockchain) for security flaws, or get advice on how to design a protocol1. Its security audits are led by university professors who specialize in cryptography and distributed systems2.
Based in Novi Sad, Serbia, Ethernal has worked with blockchain projects since 2020, and its four-person leadership team holds doctorates1. For Cardano, its main contribution is Skyline Bridge, a service that moves the AP3X token between Cardano and the Prime chain of Apex Fusion, a separate group of connected blockchains. Ethernal's architects wrote Skyline's design, and a bridge team inside the company built it3.
Key Features
- Custom blockchain software. Ethernal builds core software such as bridges and network clients for client projects, and its homepage lists work with Polygon, Avail, Informal Systems, and Apex Fusion1.
- Security audits with a written report. Teams can hire Ethernal to review smart contracts and protocol designs for weaknesses, with a process that runs from threat modeling to a final report and an optional check of the fixes2.
- Audit reports anyone can read. Ethernal's published audit of Gear's bridge between the Vara network and Ethereum covered a zero-knowledge prover (software that proves a calculation is correct without revealing the underlying data) and its Ethereum contracts4.
- Cardano building blocks for developers. Ethernal's cardano-infrastructure library, written in the Go programming language, handles reading chain data, managing wallets, and creating and sending Cardano transactions5.
- An enterprise Ethereum client. Blade, an Ethernal project, is an Ethereum-compatible network client that gives a business its own chain with instant finality, meaning confirmed transactions cannot be reversed6.
What to Expect
The Ethernal website is a company site, not an app. Visitors find a list of services, past projects, the team, and a contact email address1. Blockchain teams that want an audit can request a quote through an online form or book a call from the security page2.
Cardano users can see Ethernal's work in action through Skyline Bridge, one of several bridges that link Cardano to other networks. A user opens Eternl on Apex Fusion's Prime chain, picks Prime as the source and Cardano as the destination, enters a Cardano address, and signs the transfer. That address then receives cAP3X, the Cardano version of the token7. Apex Fusion's documentation names the Skyline Foundation as the organization that develops and operates the bridge8.
Developers can browse Ethernal's public code repositories, where the Cardano tools and bridge components sit alongside projects in Go, TypeScript, and Rust9. Readers interested in the research side can find an IEEE conference paper describing the Ethernal Digital Certificate, a system for issuing education certificates on a blockchain10.
