# Use BTC.b

Bring your Bitcoin on-chain without KYC, custody risks, or yield complexity. BTC.b is a 1:1 Bitcoin representation that works across multiple blockchains, permissionless, decentralized, and always redeemable for native BTC.

### What You Get

When you mint BTC.b, you receive a token backed 1:1 by native Bitcoin held through Lombard's security infrastructure:

* No yield (simpler than LBTC)
* No KYC required
* 0% minting fee
* Available on Monad, Stable and Katana
* Redeemable for native BTC at any time (6 hours withdrawal period)

BTC.b is ideal if you want straightforward Bitcoin representation without the complexity of yield-bearing tokens.

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### BTC.b vs LBTC

| Feature         | BTC.b                     | LBTC                      |
| --------------- | ------------------------- | ------------------------- |
| Yield           | No                        | Yes (\~0.81% APY)         |
| Exchange rate   | Always 1:1                | Increases over time       |
| Use case        | Simple BTC representation | Earn while holding        |
| Minting fee     | 0%                        | 0% (Ethereum has gas fee) |
| Redemption fee  | 0.0001 BTC                | 0.0001 LBTC               |
| Redemption time | 6 hours                   | 7-9 days                  |

**Choose BTC.b** for maximum simplicity, lowest fees, and active DeFi participation where you control yield strategies.

**Choose LBTC** for passive yield generation and long-term holding.

Many users hold both.

***

### Mint BTC.b

You can mint from any Bitcoin wallet, hardware wallets, DeFi wallets, or exchanges that allow BTC withdrawals.

#### Before You Start

* You need native BTC in a wallet that can send to SegWit addresses
* Choose which chain you want to receive BTC.b on
* Have a wallet address ready on your destination chain

#### Steps

1. Go to the Lombard app
2. Select BTC.b minting
3. Connect your destination wallet
4. Connect with your destination chain
5. Lombard generates a unique deposit address tied to your destination
6. Send BTC to that address
7. Wait for 3-6 Bitcoin confirmations
8. BTC.b mints automatically to your destination address

#### Fees

| Fee                   | Amount           |
| --------------------- | ---------------- |
| Minting fee           | 0%               |
| Bitcoin network fee   | \~$2-20 (varies) |
| Destination chain gas | Varies by chain  |

Typical gas fees:

* Avalanche: <$1
* Solana: <$0.01
* Ethereum: $5-50

#### Minimum Deposit

0.0002 BTC (subject to change). There is no maximum.

#### Can I Cancel a Mint?

No. Once BTC is sent to the deposit address, the mint cannot be cancelled. Always verify addresses before sending.

***

### Redeem BTC.b

You can withdraw your native BTC at any time. The process takes 6 hours due to security verification and coordination with the Security Consortium.

#### Before You Start

* You need BTC.b on any supported chain
* Have a Bitcoin address ready (Native SegWit or Taproot)

#### Supported Bitcoin Addresses

| Prefix | Type                          | Supported |
| ------ | ----------------------------- | --------- |
| `bc1q` | Native SegWit (P2WPKH, P2WSH) | Yes       |
| `bc1p` | Taproot (P2TR)                | Yes       |
| `1...` | Legacy (P2PKH)                | No        |
| `3...` | Nested SegWit (P2SH)          | No        |

#### Steps

1. Go to the Lombard app
2. Select BTC.b redemption
3. Enter the amount of BTC.b to redeem
4. Enter your Bitcoin withdrawal address
5. Confirm the burn transaction
6. Wait 6 hours for BTC to arrive

#### Fees

| Fee            | Amount          |
| -------------- | --------------- |
| Redemption fee | 0.0001 BTC      |
| Gas fee        | Varies by chain |

#### Can I Cancel a Redemption?

No. Once the burn transaction is confirmed, the redemption cannot be cancelled.

***

### Bridge BTC.b Between Chains

BTC.b can be moved between supported chains using Chainlink CCIP through the Lombard app.

#### Steps

1. Go to the Lombard app
2. Select bridge
3. Choose source and destination chains
4. Enter the amount
5. Confirm the transaction
6. Wait 10-30 minutes depending on chains involved

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### Earn Lux with BTC.b

Starting in Season 3 of the Luminary Program (March 18, 2026), BTC.b participates in the Lux ecosystem for the first time.

Deploy BTC.b into eligible DeFi protocols and vault products to accrue Lux, which converts to BARD in seasonal airdrops.

Three multiplier tiers apply to BTC.b deployment:

* **DEX Liquidity and Others (e.g. restaking):** 1x (Uniswap, Curve, Fluid, Aerodrome, Meteora, Etherfi)
* **Lending Collateral:** 3x (Aave v3/4, Morpho, Spark, Fluid, Euler, Juplend, Kamino)
* **Bitcoin Earn and Lombard Strategies:** 6x

Eligible chains: Ethereum, Solana, Avalanche, MegaETH, Base. Additional protocols and chains are expected during the season.

Passive BTC.b holding in a wallet does not generate Lux. Only deployment into whitelisted protocols qualifies.

Visit the Strategies section at [lombard.finance/app](https://www.lombard.finance/app) for current opportunities and live multiplier rates.

***

### Security

BTC.b uses Lombard's full security stack:

| Layer                      | Function                                            |
| -------------------------- | --------------------------------------------------- |
| Security Consortium        | 15 independent institutions validate all operations |
| CubeSigner (HSM)           | Keys stored in hardware, never exposed              |
| Bascule Drawbridge         | Secondary verification for all mints                |
| Chainlink Proof of Reserve | Real-time verification of BTC backing               |
| Chainlink CCIP             | Secure cross-chain messaging                        |

Members include OKX, Galaxy, DCG, Wintermute, Figment, Kiln, Antpool, F2Pool, and Kraken.

Every mint and redeem requires majority consensus among validators.

#### Verify Reserves

Check Chainlink's Proof of Reserve feeds, which update every 10 minutes, to verify BTC.b is fully backed: [Proof of Reserve](https://docs.lombard.finance/learn/transparency/oracles-and-price-feeds#proof-of-reserve).

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### History

BTC.b was created by Ava Labs in 2022 for the Avalanche ecosystem. At acquisition (October 2025), it had approximately $550M in circulation and deep DeFi integrations.

Lombard acquired BTC.b's infrastructure and assets to expand it into a multi-chain Bitcoin standard. All existing integrations and user balances were maintained, token addresses remain unchanged.

***

### Next Steps

* [BTC.b FAQ](https://docs.lombard.finance/use/faq/btc.b-faq) — Common questions
* [Access DeFi](https://docs.lombard.finance/use/access-defi) — Use BTC.b across protocols
* [Lux Rewards](https://docs.lombard.finance/learn/community/lux-rewards) — Learn how BTC.b earns Lux in Season 3