Cardano Hits Major Breakthrough In Bitcoin DeFi With Smart Contract Innovation

The Cardano development team at Input Output Global has built a new tool that allows smart contracts written for the blockchain to run on Bitcoin.

The system, unveiled earlier this month, operates without modifying Bitcoin’s base code and could unlock new possibilities for DeFi on the network.

New Pipeline Bridges Cardano Smart Contracts to Bitcoin

In a significant development, Input Output Global, the company behind Cardano, announced a new way to run smart contracts on the Bitcoin network.

The update introduces a toolchain that lets developers use modern programming languages to write Cardano smart contracts.

Afterwards, they can then be executed through a new pipeline built to work with Bitcoin.

The process begins with smart contracts written in languages such as Python, TypeScript, or Scala.

These are compiled into Untyped Plutus Core (UPLC), a clean and straightforward bytecode format. UPLC acts as a bridge, allowing smart contract logic to be expressed in a standard way.

From there, the UPLC code is serialized. This step turns the code into a byte stream, which can be sent, stored, or passed into another system for processing.

The serialized code is then interpreted using a virtual machine called the CEK machine. This is a small program built to understand UPLC.

It is worth adding that rather than run this interpreter directly on Bitcoin, IOG has taken a different approach.

As revealed, the CEK machine is compiled into RISC-V, an open instruction set used widely in both research and hardware.

This means the smart contract logic can be executed in a simple, predictable environment, off-chain.

To make the system secure and reliable, IOG is using BitVMX. This tool enables the verification of off-chain computations on Bitcoin.

If there is disagreement over a result, anyone can challenge it through a step-by-step reveal of the process.

If fraud is discovered, the party that submitted the result will risk losing the deposit placed upfront.

According to the publication, the whole pipeline progresses through the following stages: UPLC → CEK → RISC-V → Bitcoin.

Bitcoin DeFi Could See New Growth

One of the primary objectives of this system is to introduce more advanced smart contract features to Bitcoin.

Bitcoin itself is known for being secure and straightforward; however, its scripting language is somewhat limited. This has made it hard to build DeFi applications directly on Bitcoin.

With this new setup, developers can utilize Cardano’s tools and languages to build applications such as decentralized exchanges, escrow systems, and stablecoins.

These apps can be executed off-chain and then verified on-chain using Bitcoin’s secure base layer.

RISC-V plays a key role in this system. It is open, well-supported, and simple enough to ensure that contract execution remains straightforward to check.

BitVMX introduces the ability to dispute incorrect results, which helps maintain system integrity without placing an extra load on the blockchain.

This setup also enables the connection between the Cardano and Bitcoin ecosystems.

Assets could be transferred across chains in a trustless manner, and developers would not need to rebuild tools for both platforms.

Functional Collaborations to Drive DeFi Evolution

The project is part of a joint effort called BitVMX FORCE. This collaboration includes IOG, Rootstock Labs, and Fairgate Labs.

At the Bitcoin 2025 event, Input Output presented the compiler that connects UPLC to RISC-V, demonstrating its functionality with the BitVMX verifier.

The team behind the project believes that Bitcoin could serve as a base for a new class of innovative contract applications.

Their aim is not to change Bitcoin, but to extend its capabilities through off-chain tools and secure verification.

By linking Cardano’s developer tools with Bitcoin’s network, this work could pave the way for a new path forward in decentralized finance built on Bitcoin.

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