Blockchain & Cryptocurrency Glossary

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Soul NFT

1 min read
Pronunciation
[sohl en-eff-tee]
Analogy
Think of a Soul NFT like a diploma that’s permanently tied to your identity and cannot be passed to someone else.
Definition
A non-transferable NFT bound to a unique identity (often a wallet or on-chain handle) representing personal credentials, achievements, or reputation.
Key Points Intro
Soul NFTs provide immutable, non-tradable proofs of identity or accomplishment.
Key Points

Non-transferable: locked to a single address or DID

Identity binding: links on-chain credentials to an identity

Use cases: KYC/AML proofs, membership badges, certifications

Privacy: may include zero-knowledge attestations

Example
BrightID issues Soul NFTs to verified individuals, enabling them to participate in identity-gated airdrops without duplicates.
Technical Deep Dive
Soul NFTs implement ERC-721 with transfer hooks that revert on `transferFrom` calls. Identity oracles (e.g., BrightID) issue signed attestations stored in metadata. zk-SNARK circuits can prove possession of a credential without revealing personal data. Minting requires off-chain verification and on-chain proof submission.
Caveat
Ties identity to a single address, complicating wallet recovery and upgrades.
Related Terms
Soulbound Identity

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