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Overview

Welcome to spone.fun — a real-world application built using Succinct’s SP1 zkVM, designed to bring verifiable fairness to random selection.

What is Spone?

Spone (Select & Pick One) is a web platform and public API that enables you to run cryptographically verifiable random draws using zero-knowledge proofs (ZKPs). Whether you’re hosting a giveaway, lottery, or raffle, Spone helps you prove fairness transparently and securely.

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Today, Spone includes:

  • Draw API: https://api.spone.fun/draw – A fully public and verifiable random selection endpoint.

  • Draw Interface: https://draw.spone.fun – A clean and user-friendly web UI for running provable draws.

  • Games:

    • More SP1-powered games coming soon.

Why I Built This

Many people run into the same challenge when conducting random draws — how do you prove that it was actually fair? Anyone can claim something was “random,” but trust is hard to earn.

With zkVM, I can cryptographically prove that the selection was performed exactly as specified, using the given inputs, and with no manipulation. Thanks to SP1, that proof can be verified by anyone — no need to trust me, just verify the proof


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