Bitcoin’s biggest DeFi drawback under attack as OpNet unlocks smart contracts on mainnet

Bitcoin’s $BTC$69,657.53 biggest limitation just got shattered. A new protocol went live Thursday, making it simple to put the largest cryptocurrency directly to work in powerful, yield-generating strategies within the booming world of decentralized finance (DeFi).

OpNet, a new smart-contract protocol, was activated on the Bitcoin blockchain, marking the arrival of DeFi-powering smart contracts that run directly on Bitcoin’s foundational layer. This keeps traders’ bitcoin on Bitcoin’s mainnet through standard transactions with $BTC as the only fee token.

DeFi powers lending and borrowing activities that allow token holders to earn additional returns on their coin holdings. Holders of tokens native to smart-contract blockchains like Ethereum have always been able to access DeFi seamlessly, because the blockchain itself hosted most of the DeFi industry.

But the promise of DeFi came with a catch: it was closed to bitcoin. Bitcoin owners had to adopt strategies such as wrapping $BTC with centralized services like Bitgo or Coinbase, using bridges to move assets to Ethereum or other chains, or depositing into custodial lending platforms to access the industry. Each step introduced counterparty risks that contradicted Bitcoin’s core principle of trustless, self-sovereign money.

OpNet’s mainnet debut claims to solve that issue and represents the first time users can access real DeFi applications, such as swapping, staking and token launches, without bridges, wrapped $BTC or leaving Bitcoin’s base layer, potentially eliminating the security risks and custody issues that have plagued previous Bitcoin DeFi attempts.

All users need to do is connect their wallets to DeFi applications, keeping their bitcoin as it is and maintaining full control over their assets.

“Every OpNet transaction is just a Bitcoin transaction. Users are never doing anything but making Bitcoin transactions,” Chad Master, a co-founder of OpNet, said in an interview with CoinDesk. “Connect your $BTC wallet, make a trustless swap, and your Bitcoin stays Bitcoin. This is what native DeFi on Bitcoin actually looks like.”

The protocol turns Bitcoin DeFi seamless by embedding contract bytecode, parameters and execution data directly into standard Bitcoin transactions. These are then confirmed by Bitcoin miners, ensuring that decentralized applications operate with their execution and state immutably anchored to Bitcoin’s base layer.

Debuts with DeFi stack and OP-20 standard

OpNet’s mainnet activation includes a live DeFi stack running on Bitcoin layer 1. The initial ecosystem enables permissionless smart-contract deployment and focuses on trading, yield generation and native asset issuance.

That allows developers to introduce tokens under the OP-20 standard and build DeFi applications that settle directly to Bitcoin’s base layer.

Users can access MotoSwap, a decentralized exchange for swapping $BTC and OP-20 tokens directly on Bitcoin. The platform includes NativeSwap’s two-phase execution model designed to handle Bitcoin’s slower block times, and staking contracts that let users create yield farms for new assets.

The SlowFi embrace

While other blockchains and protocols yearn for speed, OpNet views Bitcoin’s inherent slowness, characterized by 10-minute block times and L1 congestion dynamics, as features, not bugs, calling it “structural exit friction.”

“This is where the SlowFi thesis becomes real: slower blocks, higher fees during congestion, and capital that stays in protocols long enough to actually build value,” Chad Master said. He argued that this friction makes liquidity stickier, preventing “panic exits” and fostering a more durable DeFi cycle where protocols have time to stabilize and iterate.

Master likened the debut to a replay of a foundational era in crypto:

“We’re basically running back 2020 Ethereum DeFi Summer play-by-play on Bitcoin Layer 1 … But this time, the environment is better. Bitcoin’s 10-minute blocks create natural exit friction that sustains liquidity longer.” This suggests a more robust and sustainable DeFi ecosystem, less prone to the “farm-and-dump” cycles seen on faster chains.

The OpNet team also signaled major stablecoin integration on Bitcoin via the OP-20S extension standard as a key milestone for early Q2 2026, promising to further expand the utility of Bitcoin-native DeFi.