5 Layer 2 Bitcoins That Are Set to Rock 2025

Bitcoin's Layer 2 ecosystem has expanded substantially over the last year, from its infancy to a hotbed of ground-breaking developments.

As 2025 approaches, Bitcoin's Layer 2 ecosystem has seen a remarkable evolution, with new projects emerging to push the boundaries of what was once thought impossible for the apex cryptocurrency. Here are 5 layer 2 Bitcoins that are set to make waves in the coming year, according to CoinGecko.

1. Core Chain: A Bridge Between Bitcoin and Ethereum for a More Powerful Blockchain

Core Chain, which was launched in 2023, currently has a Total Value Locked (TVL) of over $300 million. It was founded by two individuals, one being a staunch Bitcoin supporter and the other being an avid Ethereum enthusiast, with the aim of resolving the blockchain trilemma.

Their creation is a layer-1 blockchain that is compatible with the Ethereum Virtual Machine (EVM), combining Bitcoin's decentralization and security with Ethereum's versatility. Utilizing a unique blend of Delegated Proof of Work (DPoW), Delegated Proof of Stake (DPoS), and Non-Custodial Bitcoin Staking, Core Chain is powered by the Satoshi Plus consensus mechanism.

While CORE and BTC token holders can stake their assets to earn rewards, miners can also allocate their hash power to support Core Chain validators. According to CoinGecko in their video, “This mechanism allows Bitcoin miners to extend their involvement into layer 2 ecosystems.”

2. Bitlayer: Enhancing Bitcoin's Scalability with BitVM Technology

Launched in April 2024, Bitlayer was founded by a consortium of renowned projects, including Polkadot, Huobi, and Polygon, among others. It introduces the Bitcoin Virtual Machine (BitVM), which leverages Bitcoin's security to provide advanced smart contract capability, similar to Ethereum.

Utilizing an optimistic roll-up approach, Bitlayer addresses Bitcoin's scalability concerns, enabling efficient transaction processing without congesting the main network. CoinGecko highlights that “BitVM allows one to check transactions without taxing the central blockchain of Bitcoin.”

The ecosystem, which boasts a TVL of around $300 million, features decentralized exchanges, lending platforms, and staking services, among other applications.

3. Merlin Chain: Innovating Bitcoin with zk-Rollup Technology

Another EVM-compatible Bitcoin layer 2 solution that utilizes zk-rollup technology is Merlin Chain. It was launched by Bitmap Tech in January 2024 with the aim of “Making Bitcoin Fun Again.” Transactions are processed on Merlin's chain, aggregated, verified using zk-proofs, and then finalized on Bitcoin's base layer.

Having quickly gained traction with its innovative approach to enabling diverse DeFi use cases, thus enhancing the Bitcoin ecosystem, Merlin Chain boasts a TVL of $100 million.

4. B-Squared: Securing Bitcoin Transactions Seamlessly with zk-Rollups

Another project that leverages zk-rollups for efficient off-chain transaction processing is B-Squared, or B². Commencing in April 2024, it comprises a layer for data availability that is powered by incentivized storage nodes. This ensures the secure long-term storage of off-chain transaction data, which is crucial for resolving disputes or performing audits.

B²'s TVL of $90 million is attributed to its EVM compatibility, which enables the seamless migration of applications. It also supports various DeFi applications and BTC staking.

5. BOB: Bridging Bitcoin and Ethereum with a Hybrid Layer 2 Solution

Taking a different approach is BOB, which utilizes a hybrid layer 2 solution that spans both Bitcoin and Ethereum. Initially set to launch as an optimistic Ethereum roll-up in May 2024, BOB has managed to garner a TVL of $30 million.

However, its unique aspect lies in integrating Bitcoin's Proof-of-Work security through merge mining, allowing Bitcoin miners to simultaneously secure both Bitcoin's blockchain and BOB's layer 2 network.