SoulBound Tokens (SBTs): Web3
During the COVID era, while most people stayed home trying to stay safe behind masks, something entirely different was making its way into the mainstream “NFTs”.
Almost overnight, they surged in popularity and become a cool new way to showcase digital ownership and for many, even signal net worth. It even proved to be a compelling investment avenue as well, although the hype eventually cooled and the market lost momentum.
NFTs fundamentally reshaped how we think about ownership in the digital world like enabling the buying and selling of digital art, virtual real estate and collectibles.
Yet, a crucial piece of digital identity was still missing perhaps intentionally so. While NFTs focused on what we own, there wasn’t a meaningful way to represent who we are. This is where Soulbound Tokens (SBTs) entered the scene, shifting the narrative from ownership to identity.
If you play World of Warcraft then you might be familiar with “soulbound items” and that’s exactly something that inspired Eherium guy Vitalik Buterin to come with the paper called “Decentralized Society: Finding Web3’s Soul,” by Vitalik Buterin, Eric Glen and Puja Ohlhaver in 2022.
SBTs exactly solves the problem that NFT did’t see or didn’t intended to solve, SBTs are designed to function as the permanent, verifiable and non transferable building blocks of our digital personas.
An SBT is a digital identity token that is permanently linked to a specific wallet like it’s “Soul” and cannot be sold, traded or transferred to another entity. Unlike a standard NFT, which might represent a valuable piece of art that can be traded and have multiple owners in it’s digital journey.
SBTs represents an achievement, a credential, an affiliation or a reputation that belongs solely to the individual who earned it.
Example: Your driving license or event passport, it’s your unique identity that can’t be traded.
If you want to go deeper to this concepts then my recommendations would be to understand Smart Contract and various ERC standards with it’s use cases.
As per programmatic perspective, the smart contract that governs an SBT restricts the ability to transfer or approve a third party to move the token. Most SBTs implementations is based on ERC-5192 that explicitly define “locking” mechanisms to bind the token to the wallet upon minting, creating a transparent, immutable record on the blockchain.
Differences: SBTs vs. NFTs
Use Cases of SoulBound Tokens
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As I write this article SBTs are moving beyond theoretical discussion and are actively being piloted and integrated into various emerging Web3 ecosystem. Their non transferable nature unlocks powerful applications in areas where trust, authenticity and permanence are critical.
- Digital Identity and Credential Verification
One of the most promising and readily achievable use cases is in the domain of digital identity and credential verification.
- Educational Diplomas and Certificates: A graduate can present their wallet address and an employer can instantly confirm the validity of their credentials that issued on chain by University.
- Professional Licenses and Skill Badges: Similar to academic degrees, professional regulatory bodies can issue SBTs to represent licenses to practice like medical, legal or CPA licenses.
- KYCs: Post verification a SBT can be issue to individual that confirms that the individual is verified.
2. Medical Records and Data Management
Privacy preserving SBTs that can be combined with Zero Knowledge Proofs (ZKPs) can offer a potential solution for managing sensitive medical data.
- Decentralized Health Records: A medical provider can issue an SBT to a patient’s ‘Soul’ wallet, serving as a secure, decentralised identifier linked to their medical records.
So, instead of sharing entire files, patients can use ZKPs to selectively prove specific medical facts like vaccination status, blood type, or negative test results without revealing unnecessary personal details or data.
3. Credit Scoring and DeFi Lending
Traditional decentralised finance (DeFi) often relies heavily on over-collateralization because lenders cannot assess a borrower’s creditworthiness. SBTs offer a path forward>>
I find this one of the most interesting use case after KYC use case.
- On Chain Credit Reputation: Lenders can issue SBTs to borrowers who successfully repay loans on time. Over time, these tokens accumulate in a borrower’s ‘Soul’ wallet, creating a verifiable on chain credit history.
This can pave the way for under collateralized lending in DeFi, opening the ecosystem to a wider range of participants.
4. Gaming and Esports Achievements
Gaming is another natural fit for SBTs, providing a permanent and authentic way to recognise player achievements.
- Permanent Achievement Badges: Players often invest significant time and effort in games but their achievements can be difficult to prove or lose if they switch accounts or games. SBTs can be issued for game achievements, ranks or tournament victories, creating a permanent, verifiable “trophy cabinet” in the player’s wallet that is distinct from transferable in game assets like skins and player mods.
Challenges and Limitations of SBTs
Despite their immense potential, several significant hurdles must be overcome before SBTs can reach widespread adoption.
- Privacy Concerns: The on chain, immutable nature of SBTs presents a major privacy challenge. While specific medical data can be obscured, the metadata associated with an SBT that is publicly visible. However, we can combine it with privacy enhancing technologies like ZKPs to protect sensitive metadata is essential.
- Centralization Risks: SBTs rely on “issuers” educational institutions, companies, medical providers or etc. The entire system’s integrity depends on the trustworthiness of these issuers. If an issuer is compromised or centralized, the SBTs they issue may become less valuable or even fraudulent.
- Wallet Management: If a user loses access to their ‘Soul’ wallet, they also lose access to their entire collection of SBTs. This highlights the critical importance of secure wallet management and the need for robust decentralized recovery mechanisms that do not rely on a single central authority.
- Adoption Barriers: Integrating SBTs requires significant institutional and technical overhead. Educational institutions, professional organizations, and governmental agencies must adopt new standards and processes, a transition that will take time and require widespread consensus.
Conclusion: Soulbound Tokens and the Future of Web3
I believe that with AI becoming mainstream, it’s more important than ever to have strong controls in place to safeguard against fraud and identity theft.
Soulbound Tokens are more than just a new token standard, they represent a fundamental shift in how we conceptualise and build digital identity. By prioritising utility, trust and authenticity over market speculation, SBTs provide the critical building blocks for a more robust, equitable and human centric decentralised society.
I enjoy discussing and architecting these technologies. If you’d like to connect, feel free to drop me a message on LinkedIn.
~AshishSecDev
