The Vibe: Non-transferable NFTs permanently tied to your wallet — like a digital soul or reputation badge you can’t sell or give away.
The Details: Soulbound Tokens are NFTs that cannot be transferred, traded, or sold once minted to a wallet (“soul”). Proposed by Vitalik Buterin in 2022, SBTs represent achievements, credentials, memberships, or reputation that should stay with a person forever (e.g., diplomas, job history, POAPs from events, DAO voting history, proof of humanity). They enable decentralized identity, non-financial utility, and trust signals without central issuers. In 2026, SBTs are used in projects like POAP (some are soulbound), ENS soulbound domains, and emerging DID (decentralized identity) systems on Ethereum L2s.
Pro Tip: SBTs are for identity/reputation, not investment — don’t expect them to pump. They live in your wallet forever, so use a secure one (hardware or burner for risky claims). Check official mint links only — fake SBT drops steal wallets.