What Is a
Soulbound Token?
The technology behind credentials that can never be forged, copied, or transferred. Here's how Sealbound uses Soulbound Tokens to make verified credentials permanent — powering the Sealbound white-label credentialing platform.
A Soulbound Token (SBT) is a blockchain token that is permanently bound to a specific wallet. Unlike regular NFTs, Soulbound Tokens cannot be sold, traded, or transferred. Once minted, they stay with the recipient forever.
This makes SBTs perfect for credentials. A university degree, a compliance certification, or a professional designation should belong to the person who earned it — and no one else. Sealbound mints every verified credential as a Soulbound Token on Polygon blockchain, making it part of the most comprehensive white-label credentialing infrastructure available.
The concept was introduced in a 2022 paper by Ethereum co-founder Vitalik Buterin, who proposed non-transferable tokens as the foundation for a "decentralized society" built on verifiable reputation and credentials.
When an organization issues a credential through Sealbound, three things happen:
Credential Created
The issuer designs the certificate and adds recipient details. Sealbound generates the credential with a unique identifier and cryptographic hash.
SBT Minted On-Chain
A Soulbound Token is minted on Polygon. The token stores only the cryptographic hash — no personal data. The transaction is permanent and timestamped.
Recipient Claims It
The recipient claims the credential via email link. The SBT is bound to their identity. They can share it on LinkedIn, verify via QR code, or display it anywhere.
A PDF certificate proves nothing — anyone can edit it. A regular NFT can be sold to someone who never took the course. A Soulbound Token is the only format where possession equals proof of achievement, permanently and verifiably.
Sealbound follows a strict privacy-first architecture for all verified credentials issued through the platform. Here's exactly what lives where.
On-Chain (Polygon)
Off-Chain (AWS UAE)
For the technically curious — here's what powers Sealbound's credential infrastructure.
A Soulbound Token (SBT) is a non-transferable blockchain token permanently bound to a specific wallet. Unlike regular NFTs, SBTs cannot be sold, traded, or moved. Sealbound uses SBTs on Polygon to represent verified credentials — degrees, certifications, and achievements tied to the recipient forever.
Regular NFTs can be bought, sold, and transferred. Soulbound Tokens cannot. Once minted, an SBT stays with the recipient permanently. This is essential for credentials — a medical certification or university degree should not be transferable to someone who didn't earn it.
No. Sealbound stores zero personal data on-chain. The SBT contains only a cryptographic hash — proof that a credential was issued, by whom, and when. All personal information remains off-chain on encrypted AWS infrastructure in the UAE.
Yes. Issuers can revoke credentials when needed. The on-chain status updates in real time, and the verification page reflects the revocation. The full blockchain history is preserved for audit purposes.
Recipients don't need to manage a crypto wallet. Sealbound handles wallet creation in the background. Recipients claim their credential via a simple email link — no blockchain knowledge required. Advanced users can optionally connect their own wallet.
Polygon offers the same security guarantees as Ethereum with significantly lower gas fees and faster transaction times. Minting an SBT on Polygon costs under $0.50, compared to $5-20+ on Ethereum mainnet. For credential issuance at scale (100K+/day), Polygon is the only practical choice.
See Soulbound Tokens in Action
Book a demo and we'll show you exactly how Sealbound mints, delivers, and verifies SBT-backed verified credentials through our white-label platform — with your specific use case.