Blockchain & Cryptocurrency Glossary

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Bridged NFT

1 min read
Pronunciation
[brijd en-eff-tee]
Analogy
Like an international driver’s license that lets you drive in multiple countries while your original license remains valid at home.
Definition
A non‑fungible token that represents ownership of a unique asset on one chain but is usable on another chain via a bridging mechanism.
Key Points Intro
Bridged NFTs allow digital collectibles and game assets to move across blockchains.
Key Points

Lock & mint: Original NFT locked, a proxy minted on destination chain.

Metadata consistency: URI and traits mirrored across chains.

Interoperability: Enables NFTs in foreign marketplaces or games.

Redeemability: Burn bridged NFT to unlock original.

Example
An ERC‑721 art piece on Ethereum is locked in a bridge and a Polygon‑ERC721 representation is minted so users can trade it on Polygon marketplaces.
Technical Deep Dive
Bridge contract calls `lockNFT(tokenId, owner)`. Relayer watches event, calls `mintBridgeNFT(tokenId, metadata)` on destination. A burn on destination triggers `unlockNFT` on origin after proof verification.
Security Warning
If bridging logic is flawed, NFTs can be duplicated or lost; ensure atomic lock‑mint and burn‑unlock sequences with Merkle proofs.
Caveat
Bridged NFTs may not carry provenance history fully; marketplaces should display origin chain info.
Related Terms
ERC‑721

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