OPN Grid Puzzle
On-chain 3x3 puzzle game that mints NFTs upon solution.
by meows5 · submitted May 29, 2026
Community votes
0
Voting opens when this submission reaches the Top 10 stage.
Overall score
—/ 100
Weighted average across the 5 judging criteria.
Description
01/03
What the builder said.
Written by the team, rendered as the markdown they typed in the submission wizard.
What we built
OPN Grid Protocol is a permissionless on-chain verification and incentive system where users submit structured proofs in the form of a 3x3 state array (uint8[9]). These proofs are validated entirely on-chain without any off-chain computation, oracle, or trusted intermediary.
When a submitted proof matches a deterministic target state stored inside the smart contract, the protocol mints an ERC-721 token as an immutable reward receipt representing successful verification.
Each wallet is allowed only one valid proof submission, ensuring fairness and preventing Sybil-style abuse. The system operates fully deterministically and relies solely on EVM execution.
Why
We built OPN Grid Protocol to explore a minimal trustless incentive layer where verification logic is embedded directly into the blockchain.
Most existing incentive systems rely on off-chain verification, centralized scoring, or oracle-driven validation, which introduces trust assumptions.
This project demonstrates that verification itself can become a primitive in decentralized systems — enabling:
- Trustless proof submission
- Deterministic validation
- On-chain reward issuance without intermediaries
The goal is to show how blockchain can act not only as a financial layer, but also as a generalized verification and incentive infrastructure.
How it works
- User submits a structured proof (uint8[9]) representing a 3x3 state
- Smart contract checks whether the wallet has already submitted a proof (anti-abuse layer)
- Contract performs deterministic comparison against the stored target solution
- If valid:
- The proof is accepted as verified
- A unique ERC-721 token is minted as a reward receipt
- A PuzzleSolved event is emitted for transparency and indexing
- If invalid:
- Transaction is reverted and no state changes occur
The entire lifecycle is executed on-chain, making the system fully trustless, reproducible, and permissionless.
Key Features
- Fully on-chain proof verification system
- Permissionless submission mechanism
- ERC-721 reward receipt issuance
- One-wallet-one-proof constraint (anti-Sybil)
- Deterministic EVM-native validation logic
- No oracle, no backend, no off-chain dependency
Roadmap
02/03
What ships next.
The builder's own next-quarter plan. Use it to gauge follow-through and ambition.
Roadmap
OPN Grid Protocol will evolve from a minimal on-chain verification primitive into a broader permissionless incentive layer for structured proofs.
Q1 · Current (MVP Phase)
- Deploy core verification contract on testnet/mainnet
- Launch permissionless proof submission system
- Implement ERC-721 reward receipt minting
- Validate deterministic on-chain proof comparison
- Publish open-source repository and documentation
Q2 · Expansion Phase
- Introduce API layer for external dApps integration
- Add multi-proof verification modes (extended grid logic)
- Enable analytics dashboard for proof submissions
- Optimize gas costs for large-scale usage
- Prepare developer SDK for integration
Q3 · Protocol Growth
- Open protocol for third-party reward strategies
- Enable configurable verification rules (pluggable logic)
- Support composable incentive modules
- Integrate with other on-chain identity systems
Beyond · Long-term Vision
- Evolve into a generalized on-chain verification primitive
- Become infrastructure for proof-based incentive systems
- Enable cross-protocol reputation and contribution scoring
- Support broader “proof-to-earn” ecosystems across Web3
On-chain proof
03/03
2 contracts on OPN Chain.
The chain itself confirmed every deployment is valid, signed by the builder's wallet, and inside the season's window.