Contact person: Business Client

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Location: Ahmedabad, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a full-stack custodial wallet system that combines the centralised power of an exchange such as Binance with the clean, mobile-first interface users recognise from Trust Wallet. Every blockchain transaction—deposit, withdrawal, or on-chain settlement—must route through a single Admin Wallet, while balances move instantly off-chain when users send funds to each other. That structure lets me freeze, unfreeze, or otherwise act on any account at will.

Functional scope
• Supported flows: cryptocurrency deposits, cryptocurrency withdrawals, and instant user-to-user transfers recorded in our ledger but not broadcast on-chain.
• Admin authority: full control of every wallet, including the ability to pause activity, reverse internal transfers, or place holds on balances.
• Security baseline: two-factor authentication baked into both the user apps and the admin dashboard.

What I expect from you
1. A robust backend (language and framework are your choice) that handles key generation, transaction signing, hot/cold wallet logic, and a real-time ledger for off-chain moves.
2. REST or GraphQL APIs so our mobile and web clients can call balance, history, and transfer endpoints.
3. A lightweight, responsive front-end that mirrors Trust Wallet’s ease of use—simple asset list, send/receive screens, QR scanner, and activity log.
4. An admin console where I can view deposits, approve or reject withdrawals, freeze accounts, and audit logs.
5. 2FA implementation (TOTP or similar) for both sides.
6. Deployment scripts, basic unit/integration tests, and concise documentation so my team can maintain and extend the system.

Hand-off is complete when I can:
• Create users, fund them via the Admin Wallet, move funds between users off-chain, and withdraw on-chain from the Admin Wallet.
• Freeze a user and see their attempted actions blocked.
• Enable or disable 2FA per account.

If you’ve delivered custodial or exchange-level projects before and can meet these checkpoints, let’s get started." (client-provided description)