Cardano has taken a significant step in its pursuit of becoming a comprehensive venue for Bitcoin DeFi (BTCFi), allowing users to transfer their Bitcoin Ordinals to its mainnet through an innovative bridge facilitated by BitVMX.
Cardano has taken a significant step in its pursuit of becoming a comprehensive venue for Bitcoin DeFi (BTCFi), allowing users to transfer their Bitcoin Ordinals to its mainnet through an innovative bridge facilitated by BitVMX.
Bitcoin Ordinals is a protocol that allows users to embed data, such as images and text, directly onto the blockchain.
Introduced in February 2022, it uses the Taproot upgrade to enable more complex transactions.
Ordinals can be used for various purposes, including digital collectibles, art, and even interactive stories.
The technology has gained popularity among developers and artists, who see its potential for creative expression and innovation.
The on-chain transaction between Bitcoin and Cardano was made possible by the Cardano creator, ‘Input | Output (IO)’, at the recent Bitcoin 2025 conference in Las Vegas. This development marks a significant milestone in IO’s ultimate goal of enabling a full integration between Bitcoin and Cardano.
Bitcoin is a decentralized digital currency created in 2008 by an anonymous individual or group using the pseudonym Satoshi Nakamoto.
It was designed to facilitate peer-to-peer transactions without the need for intermediaries like banks.
Bitcoin operates on a blockchain, a public ledger that records all transactions made with the currency.
As of 2022, there are over 18 million Bitcoins in circulation, with a total market value exceeding $1 trillion.
Unlocking DeFi Services for BTC Users
The bridge, which utilizes BitVMX as an interoperability protocol built with the BitVM programming language, represents a ‘preview of what is to come’ according to IO. This bridge aims to provide DeFi services for Bitcoin users, unlocking a vast amount of liquidity from the value stored in bitcoin.
As of 2022, there are over 300 million bitcoin users worldwide.
The majority of these users are located in countries with a high level of economic freedom and internet penetration.
The United States has the largest number of bitcoin users, followed by China and Japan.
Bitcoin users can be categorized into three main groups: investors, merchants, and individual users.
Investors hold bitcoins as a store of value or for speculative purposes, while merchants use bitcoins to accept payments from customers.
Individual users utilize bitcoins for everyday transactions, such as buying goods and services online.

To achieve this goal, IO has developed the ‘Cardinal’ protocol, a portmanteau of Cardano and Ordinals, which harnesses BitVMX to assign Bitcoin-native assets to addresses on Cardano. The Ordinals protocol, introduced at the start of 2023, allows for the inscription of data onto individual satoshis, making them unique and traceable.
A New Era for BTC Users
The introduction of this bridge and the ‘Cardinal’ protocol signifies a new era for Bitcoin users seeking DeFi services on Cardano. By bridging the two chains, IO is creating a seamless experience that will allow users to access a wide range of financial services previously unavailable to them on the Bitcoin network.
A Closer Look at the Benefits
The benefits of this bridge and the ‘Cardinal’ protocol are multifaceted. Firstly, it enables users to transfer their Bitcoin Ordinals to Cardano, thereby expanding the potential use cases for these unique assets. Secondly, it provides a gateway for DeFi services tailored to the Bitcoin ecosystem, unlocking new opportunities for financial growth and innovation.
Conclusion
The recent breakthrough in interoperability between Bitcoin and Cardano marks an exciting development in the world of cryptocurrency. As IO continues to push forward with its ambitious plans, one thing is clear: this bridge will play a pivotal role in shaping the future of DeFi services on both chains.