Why This System Is Secure
Bitcoin's digital signatures provide strong security because:
Private Keys Never Leave the Wallet
The network only sees:
- •Signature
- •Public key
The private key remains secret.
Signatures Cannot Be Forged
ECDSA makes it computationally infeasible to:
- •Guess the private key
- •Generate a valid signature without it
Every Node Independently Verifies
Thousands of nodes verify each transaction. No central authority is required.