ERC-5114

Smart Contract Standard

Soulbound 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.

Padrão Aberto

Links

Visitar Comunidade

Detalhes

Licença

https://github.com/ethereum/EIPs/blob/master/EIPS/eip-5114.md

Status de Dev 🏁 Final

Detalhe do Status de Dev

Review (pending Final)

Proprietário

Micah Zoltu

País

Global / Decentralized

Ano de Início 2022

Stack

Solidity / EVM; requires ERC-721 for the target NFT persona; collectionUri and badgeUri must point to immutable content-addressable resources

Financiamento

Volunteer / individual author contribution

Última Investigação 9 de mar. de 2026

Domínios de Caso de Uso

Identity & Trust

Capacidades

Portable attestations

Smart Contract Standard Atributos

Origins

Proposed by Micah Zoltu on May 30, 2022, inspired by Vitalik Buterin, E. Glen Weyl, and Puja Ohlhaver's 'Decentralized Society: Finding Web3's Soul' paper (May 2022), which theorized non-transferable 'soulbound' tokens for on-chain identity and reputation. ERC-5114 specifically binds badges to NFT personas rather than EOA wallets, enabling portable identity through NFT transfers.

Data Formats

Mint event: (badgeId, nftAddress, nftTokenId); collectionUri() and badgeUri(uint256) returning immutable URIs; metadataFormat() for data format versioning; content-addressable (e.g., IPFS CID) URIs strongly recommended

Terms

CC0

Funds

Unknown

Based On

ERC-721 (target NFT persona); conceptually derived from Buterin/Weyl/Ohlhaver 'Decentralized Society' paper (2022)

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)