Open-source Bitcoin wallet appropriate for beginners who want to gradually reach advanced self-custody. It features a progressive framework that strikes a balance between; security, fees, and UX. Your progression as a user takes four difficulty levels, reflecting your understanding of Bitcoin and the amount of balance you want to secure. The app can be ultra newbie-friendly since it comes with Lightning Network service providers, but as your balance grows, you can transfer your Bitcoin into a more secure environment by creating hot or cold storage vaults.

Note: We do NOT custody your funds.

Level 1 - absolute beginner: Lightning Account (e.g Strike)
- Instant Lightning Network payments with low fees via a custodial or exchange service provider.
- Receive small or medium amounts of bitcoin
- Threshold-based withdrawals to minimize withdrawal fees and security/counterparty risk.
- Seamless withdrawals to self-custodial vaults. (if created)

Level 2 - newbie: Lightning Vault (Bark)
- Instant noncustodial Lightning payments with low fees.
- Receive small or medium amounts of bitcoin
- Seamless swap to/from to a custodian(s) or exchange(s).
- Lightning capsule refresh reminder to keep balance backed up and under the user’s full control.
- Withdraw to hot or cold storage (if created)

Level 3 - advanced: Hot or Cold Storage Vault
- Generate a 12-word backup
- Connect hardware wallet
- Receive large to medium amounts of bitcoin (onchain)
- Withdraw from Lightning wallets to cold or hot storage
- Lightning wallet Top-ups for quick liquidation
- Move coins between vaults
- Batch, label, and manage coins (coincontrol)

Level 4 - power user: Multi-Custodian multi-vault
- Diversify funds across multiple Lightning custodians and your self-custodial vaults.
- Swap between custodians and non-custodial Bark vault
- Manage custodial thresholds to balance risks.

Other features:
- Interactive bar display to visualize balance in relation to your thresholds
- Graphical representation of 'Capsules' or coins (UTXOs) that reflect their size (soon)
- Total balance across all checking accounts and vaults

Technical specs:
- LNURL
- SegWit-first
- Bip39
- Watch-only vault
- PSBT
- Private keys never leave your device