NonTransferable (Soulbound Token)

Token-2022 extension that fully blocks transfers — the token can only be held, burned, and the account closed. Soulbound on Solana.

NonTransferable

NonTransferable is a Token-2022 mint extension that blocks every transfer of a token. Once minted, the token can only be held, burned, or the token account closed. This behavior is known as a soulbound token.

Use cases

On-chain credentials — certificates, diplomas, achievements
Membership markers — DAO memberships, whitelist tokens
Reputation tokens — cannot be sold or transferred
Compliance markers — KYC confirmations tied to the person

Restrictions

Cannot be combined with TransferFeeConfig (conflict)
Must be activated at mint creation, cannot be added later
Permanent Delegate still works — the issuer can still burn or freeze the token

Account counterpart

There is a companion account extension NonTransferableAccount, automatically enabled when a token account holds a NonTransferable mint.

Deep dive

Pillar Token-2022 explained.