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Cross-Chain NFT Marketplace

1 min read
Pronunciation
[kraws-cheyn en-eff-tee mahr-kit-plays]
Analogy
Like an international art fair where galleries from different countries showcase works under one roof.
Definition
A marketplace platform that lists, discovers, and facilitates trading of NFTs from multiple blockchain networks in a unified interface.
Key Points Intro
Cross‑chain NFT marketplaces aggregate assets and order books across networks for seamless trading.
Key Points

Multi‑chain indexing: Crawls events on Ethereum, Solana, etc.

Unified UI: Displays wallet balances and listings across chains.

Cross‑chain settlement: Executes atomic swaps via bridges.

Royalty enforcement: Honors creator fees on each network.

Example
A user lists a Solana NFT for sale and a buyer on Polygon completes purchase; the marketplace uses a bridge router to transfer the NFT and funds atomically.
Technical Deep Dive
Back end runs subgraphs per chain, normalizes metadata, and stores in a unified DB. Trades use smart order routing: buyer’s payment on chain A triggers NFT transfer on chain B via CCIP. Escrow contracts hold assets during the atomic operation.
Security Warning
Bridging failures can trap assets; implement escrow timeouts and refund logic.
Caveat
Cross‑chain gas fees and latency can degrade UX; consider batching or subsidizing fees.

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