How BULL Wallet Uses Liquid to Send and Receive Lightning Without Managing Channels

The short answer: BULL’s Instant Payments Wallet is built natively on the Liquid Network. It lets you send and receive Bitcoin payments instantly, including to and from any Lightning wallet, without opening channels, managing liquidity, or running any background infrastructure. Your private keys stay on your device and Bull Bitcoin never holds your funds at any point.

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The question most people ask wrong

When they see the Instant Payments Wallet in BULL Wallet, most people assume it runs on Lightning.

Lightning is powerful, but self-custodial Lightning, the kind where you actually hold your own keys without relying on a custodian, comes with a set of operational requirements that most people do not anticipate until they are already frustrated. To use Lightning in a genuinely non-custodial way, you typically need to open payment channels, fund them with Bitcoin, manage inbound liquidity so that other people can pay you, rebalance those channels as funds shift in one direction, keep your node online at all times so payments can route, and monitor for force closes when counterparties go offline without warning.

These are not edge cases. They are the normal, ongoing maintenance tasks of running a self-custodial Lightning node. The ecosystem has built tools to address them, including LSPs (Lightning Service Providers), liquidity marketplaces, and loop-out services, but each of those tools introduces its own complexity and, in most cases, its own trust assumptions.

BULL Wallet took a different path. The Instant Payments Wallet is the easiest non-custodial way to interact with Lightning, without requiring any of that infrastructure.

What is Liquid Network and why should regular Bitcoin users care

Liquid is a Bitcoin sidechain built by Blockstream and launched in 2018. Unlike payment protocols built on top of Bitcoin, Liquid runs as a parallel network with its own block production and its own native asset, Liquid Bitcoin (LBTC), which is backed 1:1 by Bitcoin held on the main chain. One LBTC can always be redeemed for one BTC through the peg mechanism, and the total supply of LBTC is fully collateralized by real Bitcoin at all times.

For regular users, three properties of Liquid are worth understanding.

Speed: Liquid produces blocks every minute, compared to Bitcoin's roughly ten minutes. Transactions reach finality in about two minutes, which is slower than Lightning's near-instant settlement but fast enough for any everyday payment scenario, from paying rent to splitting a dinner bill. Native Liquid transactions carry minimal fees and require no channel management of any kind.

Privacy: Liquid uses Confidential Transactions by default, meaning the amount and asset type are cryptographically hidden from outside observers. Anyone can verify that a transaction is valid, but without the explicit consent of the parties involved, no one can see how much was sent. On Bitcoin's base layer, every amount is fully visible on-chain. On Lightning, payment routing reveals partial information about amounts to intermediate nodes. On Liquid, payment amounts are private by default.

Simplicity: There are no channels on Liquid, no inbound liquidity to source, no rebalancing, and no node to keep online. A Liquid transaction works like a standard Bitcoin on-chain transaction: you have a balance, you send an amount to an address, and it arrives in about two minutes. The operational ceiling is dramatically lower than self-custodial Lightning.

Liquid is governed by a federation of more than 80 Bitcoin-aligned businesses, including exchanges, infrastructure companies, and asset managers, with 15 acting as active functionaries who sign blocks using an 11-of-15 multisig arrangement. These are organizations that have a direct economic interest in Bitcoin's continued success, which is a meaningful distinction from an arbitrary group of third parties. That said, this federation model does introduce a different trust assumption than Bitcoin's base layer: Liquid is not as decentralized as Bitcoin mainchain, and that tradeoff is worth understanding clearly. For the specific use case of a spending wallet holding smaller amounts for daily transactions, the tradeoff is reasonable: better privacy, lower complexity, and faster settlement than on-chain Bitcoin, without the operational overhead of self-custodial Lightning.

The Instant Payments Wallet in BULL Wallet runs natively on Liquid, but because it swaps seamlessly to Lightning through automated swaps, you do not need to know or think about Liquid when using it.

How the swaps work: Lightning and Liquid under one roof

BULL Wallet generates a single seed phrase, the standard BIP39 mnemonic that gives you full, permanent access to your bitcoin regardless of what happens to Bull Bitcoin as a company. From that single seed, the wallet creates two separate wallets: the Secure Bitcoin Wallet, which operates on Bitcoin's main chain, and the Instant Payments Wallet, which operates natively on Liquid.

When you receive a Lightning payment into your Instant Payments Wallet, the wallet performs an atomic swap using the Boltz protocol automatically and invisibly. Boltz is an open-source, non-custodial Bitcoin bridge that receives the Lightning payment and delivers the equivalent amount in LBTC directly to your Liquid wallet. From your side, you see a payment arrive and the swap mechanics remain entirely hidden.

The same logic applies in reverse. When you send to a Lightning address from your Instant Payments Wallet, the wallet initiates an atomic swap from your Liquid balance to Lightning, routes the payment, and delivers it to the recipient with no channels required on your end.

Bull Bitcoin does not take a commission on these swaps. The cost is the Boltz protocol fee, between 0.1% and 0.5% of the transaction amount depending on the swap direction, plus network miner fees. The entire mechanism is open source and the Boltz protocol is publicly auditable. Each swap is atomic: it either completes and you receive exactly what was agreed, or it fails and your funds are returned, with no custody window in between.

The sovereign individual kit

BULL Wallet is built around a three-tier architecture: a complete setup that maps each tier to a specific combination of convenience and security, so you never have to compromise one for the other.

Tier one: Instant Payments Wallet. This is your pocket cash, where you keep a small amount for everyday spending. It is the easiest non-custodial way to interact with Lightning: payments in and out are fast and frictionless, with no channels to open and no node to maintain. When your balance grows beyond what you need for spending, you move the excess to tier two.

Tier two: Secure Bitcoin Wallet. This wallet runs on Bitcoin's main chain and offers a higher security baseline because every transaction settles on the most decentralized, censorship-resistant ledger that exists. Funds here are more accessible than cold storage but are not intended for frequent daily transactions. Think of it as a checking account: you keep a meaningful amount here that you can access quickly, but you are not reaching into it to pay for a coffee.

Tier three: Cold wallet and hardware wallets. Your main stack, your savings, and your long-term holdings live here. BULL Wallet is designed as a hardware wallet companion app, supporting all the major hardware wallet devices. Your keys never touch a networked device.

The value of this separation is that you never have to make security decisions at the point of spending. Each tier has a clear purpose, and funds can move between seamlessly and as needed.

Step by step: getting started with the Instant Payments Wallet

Step 1: Download BULL Wallet
⁠BULL Wallet is available for free on iOS and Android and is fully open-source.

Step 2: Back up your seed phrase (this is not optional)
⁠When you create a new wallet, the app generates a 12-word seed phrase locally on your device. These words are never transmitted anywhere and are not stored by Bull Bitcoin. Write them down immediately, either on paper or on a metal plate, and store them offline in a secure location. This is your permanent and irreversible access to your bitcoin, and losing it without a backup means losing your funds with no possible recourse.

Step 3: Add a digital backup with RecoverBull
⁠BULL Wallet integrates with RecoverBull, an open-source encrypted backup protocol that stores your wallet backup in your own cloud storage, either iCloud or Google Drive, with the encryption key held separately on your device. RecoverBull does not replace your physical seed phrase backup, but it removes the friction that often stops newcomers from taking their first steps with self-custody. If you are explaining Bitcoin to someone for the first time, this is what makes the setup approachable: they can secure access to their funds with their existing cloud account and a strong password, without having to immediately master the discipline of managing a physical seed phrase. Both layers together provide meaningful protection.

Step 4: Fund your Instant Payments Wallet
⁠Connect BULL Wallet to your Bull Bitcoin exchange account to fund it in one click. The exchange supports Bitcoin, Liquid, and Lightning, so your purchase is delivered directly to your wallet with no intermediate steps. You can also fund the wallet by receiving any Lightning payment or Liquid transaction from an external source.

Step 5: Start spending
⁠To pay a Lightning invoice, open the wallet, tap send, scan or paste the invoice, and confirm the amount. The wallet handles the conversion from Liquid to Lightning automatically. To receive a payment, just generate a Lightning invoice.

What you can actually do with it

Any Lightning invoice anywhere in the world can be paid from your Instant Payments Wallet, and any Lightning payment sent to you arrives automatically. This covers paying at merchants that accept Lightning, using apps and services with native Lightning integration, and paying Lightning addresses, all without managing a single channel or worrying about inbound liquidity. This is what makes the Instant Payments Wallet the easiest non-custodial way to interact with Lightning.

Because the wallet uses a single seed phrase that controls both the Instant Payments Wallet and the Secure Bitcoin Wallet, you have a single recovery mechanism for your entire Bitcoin setup regardless of which layer your funds are on.

Fees, limits, and speed

Native Liquid transactions carry minimal mining fees. Boltz fees only apply when the wallet performs an atomic swap between Liquid and Lightning, and they vary depending on the direction: sending Lightning from your Liquid balance costs 0.5% of the transaction amount, while receiving Lightning into your Liquid wallet costs 0.1%. Network miner fees apply in both cases. Bull Bitcoin takes no commission on any of these swaps.

For larger payments where confirmation time is acceptable and the absolute security of Bitcoin's base layer is preferred, the Secure Bitcoin Wallet with its direct on-chain settlement is the better choice. The Instant Payments Wallet is optimized for speed and daily use with smaller amounts.

Security: what self-custodial actually means here

Self-custodial means that Bull Bitcoin never has access to your funds at any point during any transaction, whether you are receiving, sending, or mid-swap. The private keys that control your bitcoin are generated on your device and never transmitted anywhere. BULL Wallet's source code is public and independently auditable by anyone.

The Liquid federation: Liquid is operated by more than 80 Bitcoin-aligned businesses, with 15 acting as active functionaries. These are organizations with a direct economic interest in Bitcoin's success and in maintaining the integrity of the network they depend on. For a spending wallet holding day-to-day amounts, this is a robust and well-aligned trust model.

Boltz swaps: Boltz uses hash time-locked contracts (HTLCs), which are cryptographic agreements that ensure either the swap completes as specified or both parties receive their funds back automatically. There is no custody window. The protocol is open source and has been running in production for several years.

Seed phrase: Your 12-word seed phrase is your master key and no one, including Bull Bitcoin, has a copy. Back it up immediately after wallet creation, store it offline in a secure location, and use RecoverBull as an encrypted secondary layer for additional peace of mind.

FAQ

Is BULL Wallet's Instant Payments Wallet a Lightning Wallet?
⁠No. The Instant Payments Wallet runs natively on the Liquid Network, a Bitcoin sidechain. It sends and receives Lightning payments through non-custodial atomic swaps using the Boltz protocol, but it does not run a Lightning node and you never manage Lightning channels when using it. This is precisely what makes it the easiest non-custodial way to interact with Lightning.

What is LBTC and is it safe to hold?
⁠LBTC is Liquid Bitcoin, the native asset of the Liquid Network, backed 1:1 by Bitcoin at all times. One LBTC can always be redeemed for one BTC. In practice, BULL Wallet is designed so that you hold LBTC only for short periods: the wallet includes an autoswap feature, unique to BULL Wallet, that automatically converts your LBTC balance to on-chain Bitcoin once it reaches a configurable threshold (0.01 BTC by default). When enabled, this means your Instant Payments Wallet functions as a transient spending layer, not a long-term storage wallet.

What is a Boltz swap?
⁠Boltz is an open-source, non-custodial protocol that uses hash time-locked contracts to swap bitcoin between different networks, specifically between Liquid and Lightning and between on-chain Bitcoin and Lightning. The contracts guarantee that either the swap completes as agreed or both parties are refunded, and Boltz has no access to user funds at any point.

Does BULL Wallet collect my data?
⁠No. BULL Wallet requires no email address and no phone number. The absence of push notifications means there is no persistent identifier tied to your wallet. There is no analytics tracking and the open-source code is verifiable by anyone.

What happens if I lose my phone?
⁠Your seed phrase is the complete and sufficient backup for your entire wallet. Anyone with your 12 words can reconstruct the wallet and access your funds on any compatible wallet software. RecoverBull provides an encrypted cloud backup as a secondary layer, with the encryption key held on your device, so no single point of failure can expose your funds.

How is BULL Wallet different from a custodial wallet?
⁠With a custodial wallet, the platform holds your private keys. If it goes bankrupt, gets hacked, freezes withdrawals, or decides not to return your funds, your bitcoin is at risk. With BULL Wallet, you hold your keys from the moment the wallet is created and Bull Bitcoin has no access to your funds, no ability to freeze them, and no way to block a transaction.

Do I need to buy LBTC separately to use the Instant Payments Wallet?
⁠No. You can fund the Instant Payments Wallet by receiving a Lightning payment or by swapping your Bitcoin on-cjain directly from within the app. LBTC can also be purchased directly on Bull Bitcoin.

Is there a spending limit?
⁠Liquid has no hard transaction size limit for the Instant Payments Wallet. For larger amounts, the Secure Bitcoin Wallet on mainchain is the recommended tier.

Start today

BULL Wallet is the easiest non-custodial way to send and receive Lightning payments. Combined with the Bull Bitcoin exchange, it becomes the sovereign individual's swiss army knife: buy, sell, HODL, spend, pay anyone, and dollar-cost average, all from a single platform where you hold your keys at every step.

Download BULL Wallet
⁠Available for free on iOS and Android, fully open-source, with your private keys generated on your device from the first satoshi.

Download BULL Wallet for iOS and Android

Create your Bull Bitcoin account
⁠Buy and sell bitcoin with transparent commissions, no hidden fees, and self-custody from the moment of purchase.

Create my Bull Bitcoin account

Need help?
⁠You can reach the Bull Bitcoin support team directly through the chat box inside the wallet.