Signed wallet login
Each sign-in uses a fresh one-time nonce, so a captured signature cannot be replayed.
VNN Market
A marketplace moves goods and value between strangers; the rules have to be enforced by the system, not by trust.
Each sign-in uses a fresh one-time nonce, so a captured signature cannot be replayed.
Encrypted, HttpOnly, SameSite=Strict cookies, so links on other sites cannot trigger actions as the user.
Repeated failed sign-ins from one address are throttled.
An on-chain transaction hash can be applied to only one order.
Marking an order as rewarded is atomic, so retries and parallel requests never pay twice.
One Go binary and MongoDB. Separate screens and permissions for customers, suppliers and administrators.