ERC-5114
Standards/Coordination SystemsSoulbound Badge standard defining non-transferable tokens that are permanently bound to a specific ERC-721 NFT (persona) at the time of minting. Neither the holder nor the minter may transfer or revoke the badge after issuance. Designed for persistent, censorship-resistant credential and reputation attestation attached to on-chain identities rather than wallet addresses.
Hybrid Open Standard Low capture risk
Details
License https://github.com/ethereum/EIPs/blob/master/EIPS/eip-5114.md
Dev Status Review
Owner Micah Zoltu
Country Global
Start Year 2022
Stack Solidity / EVM, requires ERC-721 for the target NFT persona, collectionUri, badgeUri must point to immutable content-addressable resources
Funding Community
Last Investigated Mar 10, 2026
Smart Contract Standard Attributes
Permissions Permissionless minting (any contract may issue badges); post-mint transfer is unconditionally blocked; no admin revocation — immutability is a core design invariant
Development Tools OpenZeppelin Contracts (custom extension); Hardhat; Foundry; standard EVM tooling
Protocol Maturity / Standardization Review status; not yet Final; conceptual adoption is strong but competing standards (ERC-5484 Consensual SBT, ERC-4973 Account-Bound Tokens) create ecosystem fragmentation
Trust Framework Immutability as trust: badge issuance is on-chain and permanent; content-addressable URIs prevent post-hoc metadata manipulation; trust derives from the issuing contract's identity and reputation rather than a central registry
Target Application Domain Civic participation credentials; DAO membership and contribution records; educational and professional certifications; reputation badges; attendance proofs; KYC attestations; voter eligibility records
Deployment Model Per-issuer badge contract deployed independently; badges bound to any target ERC-721 persona at mint time
Standard Type Token Standard / Identity Standard
Ecosystem Ethereum (EVM-compatible chains)