ビットコインのレイヤー2における上位5つのソリューション：2026年におけるBTCのスケーリング

1.ライトニングネットワーク

その 雷ネットワーク is the most widely adopted Bitcoin scaling solution and remains the clearest example of a Layer 2 designed around a single purpose: fast, cheap payments. It works through bidirectional payment channels that let participants transact off-chain while only committing the opening and closing states to Bitcoin itself.

This structure makes Lightning especially well suited to micropayments, retail transactions, streaming payments, and other use cases where recording every payment on the base layer would be too slow or too expensive. Because it builds around Bitcoin’s multi-signature framework rather than a separate smart contract chain, Lightning remains one of the most Bitcoin-native approaches to scaling.

Key trade-off: Lightning is excellent for payments, but it is not intended to serve as a general-purpose smart contract platform for complex decentralized applications.

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2.スタック (STX -3.79％)

スタック is one of the most established projects focused on bringing smart contracts and decentralized applications to Bitcoin. Rather than trying to force complex programmability directly onto the base layer, Stacks uses its own execution environment and the Clarity programming language to build applications that are closely tied to Bitcoin.

Its Proof of Transfer model connects the chain to Bitcoin and gives developers a framework for building DeFi protocols, NFT infrastructure, DAOs, and Bitcoin-native applications in a more expressive environment. For many developers and investors, Stacks represents one of the clearest paths toward expanding Bitcoin into an application platform without altering the core Bitcoin protocol itself.

Key trade-off: Stacks expands Bitcoin’s programmability significantly, but application execution still occurs in a separate layer rather than directly on Bitcoin itself.

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3. 台木

ルーツストック differentiates itself by offering Ethereum仮想マシン（EVM） compatibility within a Bitcoin-secured environment. As a sidechain, it allows developers to port Ethereum-style applications with relatively limited friction, making it one of the more accessible entry points for teams that already understand the EVM development model.

Rootstock is secured through merge mining, which allows Bitcoin miners to help secure the chain without additional energy expenditure. Its native gas asset, Smart Bitcoin (RBTC), is pegged one-to-one with BTC, allowing applications to operate in a Bitcoin-linked environment while still supporting broader smart contract functionality.

Key trade-off: Rootstock benefits from developer familiarity and Bitcoin-linked security, but as a sidechain it introduces different trust and bridge assumptions than Bitcoin’s base layer.

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4. リキッドネットワーク

その 液体ネットワーク is designed less as a retail Bitcoin Layer 2 and more as specialized infrastructure for exchanges, institutions, and asset issuers. Its federated model allows for faster settlement than Bitcoin’s base layer while also supporting the issuance and movement of tokenized assets.

One of Liquid’s most distinctive capabilities is Confidential Transactions, which obscure transfer amounts and asset types from public view. That makes it particularly relevant for trading desks, exchanges, and issuers seeking more privacy and faster finality than Bitcoin alone can provide. It has also become an important platform for tokenized assets, stablecoins, and securities-related experimentation in the Bitcoin ecosystem.

Key trade-off: Liquid offers speed, privacy, and asset functionality, but it does so through a federation rather than a fully trust-minimized Bitcoin-native model.

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5. Citrea

シトレア is one of the more technically ambitious projects in the Bitcoin Layer 2 landscape. Its goal is to bring zero-knowledge rollup architecture to Bitcoin by batching transactions off-chain and then posting succinct validity proofs that can be verified against the Bitcoin chain.

This design positions Bitcoin as a settlement and data availability layer while allowing the rollup to process many more transactions more efficiently off-chain. In theory, that could open the door to more scalable applications and lower-cost execution while preserving a strong security connection to Bitcoin. Citrea is particularly notable because it reflects a broader push to bring Ethereum-style rollup innovation into the Bitcoin ecosystem.

Key trade-off: Citrea offers one of the most compelling long-term scaling models conceptually, but it remains earlier-stage and less proven than more established Bitcoin Layer 2 systems.

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佳作

ビットVM: BitVM introduces a dispute-based computation model that could significantly expand Bitcoin programmability without requiring a soft fork. While still early, it has become one of the most important conceptual developments for the future of Bitcoin-based computation.

バビロン： Babylon focuses on extending Bitcoin’s role into proof-of-stake ecosystems by allowing BTC to serve as a security asset. This creates a pathway for Bitcoin holders to participate in staking-related infrastructure without converting into another token.