What Is a Soulbound Token?
A soulbound token, an SBT, is an NFT that cannot be transferred. The idea, popularized in a 2022 paper by Vitalik Buterin and collaborators, is to attach credentials to a wallet the way diplomas attach to a person: attendance, membership, a completed course, a reputation mark. Because it cannot be sold, the hope was it would resist the speculation that ate the rest of NFTs.
How It Actually Works
- A contract mints a token to an address and omits or locks the transfer function. The wallet can hold it, display it, and sometimes burn it. It cannot list it on OpenSea.
- Use cases that make sense: proof you finished a workshop, proof you voted, a non-saleable event badge, a recovery-guardian designation in some wallet designs.
- Use cases that do not: anything you would want to sell, and anything that treats a wallet as a person. Wallets are not people. See sybil attacks.
Risks and Common Mistakes
- Wallet-as-identity is fragile. Lose the seed phrase and the credential dies with it unless a recovery scheme exists. Compromise the wallet and the credential now sits with the thief, unsellable but still displayed.
- Issuers can still lie. A soulbound badge from a nobody proves a nobody issued a badge. Non-transferability is not verification.
- Privacy. A public chain of non-transferable credentials is a resume you cannot take down. Think before collecting them.
- Most "SBT" launches were marketing on a non-transfer flag. Adoption outside a few communities stayed thin, which is useful information, not a failure of the reader.
When It Matters
Evaluating identity and reputation pitches, workshop certificates, and any "this NFT is you" claim. For actual ownership questions, start with what an NFT is and the what-you-actually-own lesson.
Related Terms
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