Solana Coin Flip Program

On-chain Solana program for a simple coin flip gambling game, written in Rust. Players bet SOL against the house; the outcome is determined by the block timestamp (even = win, odd = lose).

How it works

1. Player calls PlayGame with a bet amount in lamports
2. SOL is transferred from the player to a PDA (Program Derived Address) house account
3. Outcome determined by unix_timestamp % 2
4. If player wins: house pays out 1.95× the bet
5. If player loses: house keeps the SOL

The Withdraw instruction lets the contract owner withdraw from the house PDA.

Stack

• Rust + solana-program crate
• Borsh serialisation
• Program Derived Address for the house bankroll
• Frontend (App.tsx) — React/TypeScript wallet integration

Build

cargo build-bpf
solana program deploy target/deploy/solana_program.so

Related

• casinr_api — full casino platform