😇Welcome to SuiShadow

Introduction

Shadow

Welcome to Sui Shadow, a cutting-edge NFT marketplace on Sui where artists can sell truly “hidden” artworks—safe from theft or unauthorized re-minting. Instead of ever exposing a high-resolution PNG on-chain, Sui Shadow splits, encrypts, and stores image tiles off-chain, committing only a small Merkle root to the blockchain. Collectors who purchase an NFT gain permissioned, client-side access to decrypt and reassemble the full artwork in their browser.

The Challenge

Traditional NFT platforms mint clear-text images or store full media on decentralized storage, leaving them vulnerable to scraping, copying, or premature minting. Once exposed, an image can be stolen, re-uploaded, or relisted without the artist’s consent.

The Sui Shadow Solution

  1. Off-Chain Obfuscation

    • Each artwork is divided into encrypted tiles. Full images never reside on-chain.

  2. Merkle-Backed Integrity

    • A SHA-256 Merkle root of all ciphertexts lives in the NFT’s metadata, guaranteeing tamper-proof authenticity.

  3. Permissioned Decryption

    • Only buyers—verified via a zk-anonymous credential—can fetch, verify, and decrypt tiles from off-chain storage.

  4. Gas-Efficient Minting

    • On-chain data is limited to a 32-byte Merkle root and a few pointers, drastically reducing gas costs.

Key Technologies

  • Sui Seal: Native on-chain encryption for sealing image tiles and coordinates, ensuring confidentiality before storage.

  • ZKlogin: Zero-knowledge login and allowlist system that grants decryption rights only to verified buyers—no centralized authority or KYC required.

  • Walrus: A decentralized off-chain storage network optimized for large media, hosting encrypted image blocks at low cost and high reliability.

Why Sui Shadow?

  • Authenticity & Integrity: Any attempt to modify encrypted data invalidates the Merkle root, preventing tampering.

  • Privacy & Exclusivity: Until purchase, viewers see only a blurred or watermarked preview—protecting the artist’s IP and maintaining scarcity.

  • Seamless UX: Buyers fetch, verify, and decrypt all tiles in their browser, reassembling the full artwork client-side with zero trusted intermediaries.

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