Spark is a Bitcoin Layer 2 (L2) network that makes Bitcoin faster, cheaper, and more flexible to use.
It’s designed to let you send and receive BTC and Bitcoin-based assets (like stablecoins) almost instantly, with very low fees — all while keeping control of your own funds. Spark works alongside the Bitcoin blockchain rather than replacing it, providing a faster, more scalable way to use Bitcoin in everyday transactions and apps.
Key benefits
Faster transactions — Send and receive in seconds instead of waiting for block confirmations.
Lower fees — Spark’s off-chain design allows near-zero costs.
Self-custody — You always hold your keys; Spark doesn’t take control of your funds.
Supports multiple assets — Send and manage BTC, stablecoins, and other Bitcoin-native tokens.
Compatible with Bitcoin and Lightning — Works alongside the Bitcoin mainnet and Lightning Network.
How it works
When you use Spark, your BTC is locked in a shared address between you and Spark operators.
Spark uses statechain technology to transfer ownership off-chain, so transactions don’t have to be broadcast to the Bitcoin network each time.
This makes transactions fast, low-cost, and scalable — while still allowing you to withdraw back to the Bitcoin mainnet anytime.
Developers can integrate Spark using its Wallet SDK and Issuer SDK.
Things to know
Spark is still in beta, and features may change as it develops.
While Spark is designed to be trust-minimized, it involves shared-signature setups, which add some operational trust assumptions.
Some tools and interfaces (like stablecoin support and withdrawal UX) are still being built out.
Why it matters
Spark helps bring faster payments, cheaper transfers, and new financial use cases to the Bitcoin ecosystem — without giving up the security and decentralization that make Bitcoin valuable.