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CIP-25 (Cardano NFT Standard)

1 min read
Pronunciation
[C-I-P twenty‑five]
Analogy
CIP-25 is like the ISBN system for books, giving each NFT a standardized metadata format so marketplaces and wallets can recognize and display them uniformly.
Definition
A Cardano Improvement Proposal that specifies metadata and minting rules for NFTs on Cardano, enabling standardized issuance and discovery of non‑fungible tokens.
Key Points Intro
CIP-25 standardizes how Cardano NFTs carry metadata and provenance information.
Key Points

Metadata schema: Defines JSON fields for name, image, description, attributes.

On‑chain storage: Embeds metadata hashes in mint transactions.

Discoverability: Enables wallets to index and display NFT collections.

Interoperability: Ensures consistent behavior across dApps and explorers.

Example
A Cardano artist includes CIP-25 metadata in their mint transaction so that marketplaces like CNFT.io automatically show the artwork, name, and attributes.
Technical Deep Dive
Mint transactions include a `⟨policyId⟩.{assetName}` key in the transaction metadata labeled under `721` according to CIP-25. Wallet backends parse this metadata, fetch off‑chain JSON if referenced, and cache media via IPFS CID links. Validators enforce metadata size limits.
Caveat
Large metadata or external URIs may incur extra transaction fees and risk content availability issues.
Related Terms
Cardano
IPFS

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