Soulbound Tokens (SBTs), proposed by Vitalik Buterin, Glen Weyl, and Puja Ohlhaver in their May 2022 paper “Decentralized Society: Finding Web3’s Soul,” introduced a concept that challenged fundamental assumptions about crypto: non-transferable tokens. While the entire NFT market is built on transferability (ownership can be bought, sold, and traded), SBTs are permanently bound to a wallet — they can’t be transferred, sold, or traded. This makes them ideal for representing credentials, achievements, and identity attributes that shouldn’t be buyable.
Use cases include: educational credentials (a university issues an SBT proving you graduated — it can’t be bought or faked), professional certifications, event attendance (proof you were physically at a conference), credit scores and lending history (enabling undercollateralized DeFi loans), and DAO membership that requires demonstrated participation rather than just token purchases.
The concept addressed a genuine problem in crypto: everything is financialized and transferable, which means reputation, credentials, and social standing can all be bought. When you can buy a Bored Ape for status, when governance votes are purchasable, when airdrop farming simulates genuine usage — the distinction between authentic participation and purchased access breaks down. SBTs would create a layer of non-financial, non-transferable identity that grounds the crypto economy in genuine human attributes.
Implementation has been gradual. Binance launched BAB (Binance Account Bound) tokens for KYC-verified users. Gitcoin Passport uses soulbound-like mechanisms for Sybil resistance. Various protocols experimented with non-transferable achievement tokens. But widespread SBT adoption has been slow — partly because the infrastructure isn’t mature, partly because the crypto community’s instinct to financialize everything resists non-transferable assets, and partly because SBTs raise privacy concerns (non-transferable tokens permanently visible on a public blockchain could reveal sensitive information about the holder). The concept remains one of crypto’s most intellectually compelling ideas awaiting its implementation moment.
Leave a Reply