The Liquid Network is a Bitcoin sidechain that supports fast, private transactions and asset issuance, featuring a two-way peg system for moving bitcoin (BTC) between Bitcoin's mainchain and the Liquid sidechain.
This includes "peg-ins" to transfer BTC into Liquid as Liquid Bitcoin (L-BTC) and "peg-outs" to convert L-BTC back to BTC on the mainchain.
What Is a Liquid Network Peg-Out?
A peg-out on the Liquid Network is the process of transferring funds from Liquid back to the Bitcoin mainchain. It involves burning the Liquid Bitcoin (L-BTC) tokens on the Liquid sidechain, which releases an equivalent amount of BTC that was previously locked on the Bitcoin mainchain. This mechanism ensures a one-to-one backing between L-BTC and BTC, maintaining balance and trust in the system.
How Peg-Outs Work
Only members of the Liquid Federation—a group of trusted entities operating the Liquid sidechain—are authorized to perform Liquid peg-outs. When a peg-out is initiated:
- The L-BTC held on Liquid is burned (destroyed).
- After two confirmations on the Liquid sidechain, the peg-out request is processed.
- The BTC locked in a mainchain multisignature (multisig) wallet controlled by the federation is then released.
- The BTC is sent to a whitelisted Bitcoin address owned by the federation member initiating the peg-out.
- Peg-out BTC transfers happen in batches at variable intervals, typically every 20 to 60 minutes.
Whitelisted addresses act as safeguards to ensure federation control over the BTC supply backing the Liquid Network.
Security and Federation Role
The Liquid Federation manages a multisignature wallet on the Bitcoin mainchain, holding the BTC collateral for the Liquid sidechain's circulating L-BTC. This wallet features multiple cosigners, increasing security through distributed control.
The federation uses a combination of hot and cold wallets for handling peg-in and peg-out transactions. Particularly for peg-outs, BTC is often sent first to exchange cold wallets before reaching the end user's BTC wallet. This adds a layer of custody and compliance but introduces some trade-offs regarding transparency and potential censorship risks.
Alternatives and Practical Considerations
While only federation members can execute peg-outs directly, users can convert L-BTC to BTC by:
- Trading L-BTC with other Liquid users.
- Using exchanges or services that perform peg-outs on behalf of users.
This flexibility means users are not limited by the federation's direct peg-out process.
If you'd like to get started using Liquid, try out Aqua Wallet or Marina Wallet. You can also use our own Flash Wallet which uses Liquid in the back end to power self-custodial lightning payments.
Summary
Peg-outs are a critical part of the Liquid Network's two-way peg mechanism, enabling secure, trust-minimized transfer of Bitcoin between the sidechain and the mainchain. The process balances security with efficiency through federation-controlled multisigs and whitelisted addresses, with user alternatives available via service providers for convenience.
This system bolsters Bitcoin's liquidity and enables faster, confidential transactions on Liquid without compromising the security guarantees of Bitcoin's mainchain.
If more detailed protocol specifics or latest updates about peg-out procedures on the Liquid Network are desired, further investigation or technical documentation access can be pursued.