K-LOCK: NFC Backup & Wallet

Keep a separate, encrypted backup of your wallet seed phrases, private notes, documents and photos in case your phone is lost, damaged or replaced. K-LOCK stores encrypted backups on the SASEUL blockchain and keeps recovery information separately on an NFC card.

Try the free demo without a card before you start. Real backup and wallet use requires a compatible NXP NTAG 424 DNA or K-LOCK card, an NFC-capable Android phone and the required authentication. Not all NFC cards work. Feature passes and blockchain network fees may apply.

BACKUP AND RESTORE
• Encrypted backup and recovery of wallet recovery information and notes
• Documents and photos up to 128KiB (131,072 bytes) per original file
• Browse, search, rename and restore backup list entries
• Open supported wallet apps or their installation pages and copy recovery information after biometric authentication
• Make a spare card that opens the same backups and wallets. Cards do not sync automatically: copy again after adding data.

USDC, USDT AND ETH WALLET
View balances, receive and send supported USDC, USDT (USDT0) and ETH on Arbitrum One. ETH is required for USDC and USDT network fees. Check the destination's network and token support before sending. Access guides and links to external Hyperliquid and Lubics services. Their terms and trading or bridge fees apply.

GETTING STARTED
Explore the app with a free card-free demo. Real backups require a compatible NXP NTAG 424 DNA card or K-LOCK dedicated card, a card password, a Google account, strong biometric authentication and internet access. Not every NFC card is compatible. Standard and K-LOCK dedicated cards have different feature limits. Dedicated card issuance passes are separate in-app purchases.

BACKUP FEES
Saving a blockchain backup requires SL network fees, shown before saving. Top up the fee wallet, check its balance and withdraw remaining funds. Eligible first-time users can receive a one-time initial fee support of 1 SL.

SECURITY AND RECOVERY
Access combines the physical card, password, linked Google account and biometrics. Recovery information can be hidden automatically and the clipboard cleared. On a new phone, restore the same backups and wallets with the card and required authentication.
Losing both the original and spare cards, or losing password or account access, can make recovery impossible. Withdraw remaining assets before resetting a card. Keep a separate offline backup of important seed phrases. Permanent data availability and asset safety are not guaranteed.

Supports 13 app languages, automatic phone-language selection and dark/light themes. Requires Android 8.0 or later and compatible NFC and security hardware.
Support: mecca2024@naver.com

PASSES AND CARD CERTIFICATION
Choose a K-LOCK pass for all features or a seed phrase, note, document or photo pass for the storage feature you need. Unused purchased passes are listed under your Google account; activated features are linked to the card where the pass is used. Existing fully certified cards retain their access. Compatible standard cards already in use can be certified while preserving existing backups and wallets.

Recent changes:
• Optimized app size.
• After a pass purchase is confirmed, the app returns to the purchase list with updated pass counts.
• Refunded unused passes are now reflected in pass queries.