Soulbound Token (SBT)
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
AI Quick Summary: Soulbound Token (SBT) Summary
Term
Soulbound Token (SBT)
Category
Blockchain
Definition
A soulbound token is a non-transferable NFT permanently linked to a specific wallet, representing identity credentials, achievements, or affiliations.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-soul-bound-token
A soulbound token is a non-transferable NFT permanently linked to a specific wallet, representing identity credentials, achievements, or affiliations. Proposed by Ethereum creator Vitalik Buterin in 2022, SBTs enable on-chain reputation without the ability to buy, sell, or trade the credential.
Soulbound tokens (SBTs) are non-transferable digital tokens that permanently attach to a wallet address (called a "soul"), representing credentials, achievements, affiliations, or reputation that cannot be bought, sold, or transferred. The concept was introduced by Vitalik Buterin, Glen Weyl, and Puja Ohlhaver in their May 2022 paper "Decentralized Society: Finding Web3's Soul."
The key innovation is non-transferability. Unlike regular NFTs that can be traded on marketplaces, SBTs are permanently bound to the recipient's wallet. This makes them suitable for credentials that should not be purchasable: university degrees, employment history, protocol governance participation, credit history, or proof of attendance at events.
Binance launched one of the first large-scale SBT implementations — Binance Account Bound (BAB) tokens — in September 2022, issuing over 1.2 million tokens to verified users within the first three months according to BNB Chain data. These serve as on-chain KYC attestations that other protocols can verify without accessing personal data.
Use cases include: undercollateralized lending (using on-chain reputation instead of locked collateral), sybil-resistant governance voting (one soul = one vote), proof-of-skill credentials for hiring, and community membership verification. Gitcoin Passport uses a similar concept with "stamps" to prevent sybil attacks on public goods funding rounds.
The challenge is key management — if you lose access to the wallet holding your SBTs, you lose your on-chain identity. Community recovery mechanisms, where trusted contacts can help restore access, are being developed but remain early.
Frequently Asked Questions
What is the difference between a soulbound token and an NFT?
Regular NFTs can be bought, sold, and transferred between wallets. Soulbound tokens cannot — once issued to a wallet, they stay there permanently. This makes SBTs useful for credentials and reputation (degrees, certifications, proof of attendance) where transferability would defeat the purpose.
What are soulbound tokens used for?
SBTs are used for on-chain identity (KYC verification like Binance's BAB token), governance (sybil-resistant voting), reputation (proof of skill or contribution), credentialing (digital diplomas), and access control (community membership that cannot be sold to others).
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Related Terms
NFT (Non-Fungible Token)
An NFT (Non-Fungible Token) is a unique digital token on a blockchain that represents ownership of a specific item — such as art, music, or in-game assets. Unlike fungible tokens like Bitcoin, each NFT is one-of-a-kind and not interchangeable. The NFT market peaked at $25 billion in trading volume in early 2022 before declining over 90%.
DAO (Decentralized Autonomous Organization)
A DAO (Decentralized Autonomous Organization) is governed by smart contracts and token-holder votes instead of traditional management. Members holding governance tokens vote on proposals, treasury spending, and protocol changes. Major DAOs like MakerDAO and Uniswap collectively manage billions in treasury assets.
Governance Token
A governance token grants holders the right to vote on protocol decisions — parameter changes, treasury allocations, new features, fee structures, and upgrades. Governance tokens are the primary mechanism for DeFi protocol decentralization, transferring control from founding teams to community stakeholders.
ERC-20 Token Standard
ERC-20 is the technical standard that defines how fungible tokens behave on Ethereum and EVM-compatible chains. It specifies a common interface (functions like transfer, approve, balanceOf) that all compliant tokens implement, enabling interoperability across all wallets, DEXes, and DeFi protocols.
Network State
A network state is a concept proposed by Balaji Srinivasan describing a digital-first community organized around shared values that eventually acquires physical territory and diplomatic recognition — essentially a cloud-first nation-building model that uses blockchain for governance, identity, and coordination.
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