> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ERC-5192: Minimal Soulbound NFTs

> ERC-5192 introduces the concept of 'Soulbound' tokens to the Ethereum ecosystem by providing a minimal extension for non-transferable NFTs. Unlike standard ERC-

# ERC-5192: Minimal Soulbound NFTs

ERC-5192 introduces the concept of 'Soulbound' tokens to the Ethereum ecosystem by providing a minimal extension for non-transferable NFTs. Unlike standard ERC-

## Abstract

ERC-5192 introduces the concept of 'Soulbound' tokens to the Ethereum ecosystem by providing a minimal extension for non-transferable NFTs. Unlike standard ERC-721 tokens, which are designed for liquidity and transferability, Soulbound tokens are tied to a specific account or address, representing non-transferable credentials, memberships, or identities. This standard defines a simple boolean interface, 'locked', which prevents token movement, ensuring that the association between the 'soul' (the address) and the token remains permanent. This technical paper outlines the rationale for non-transferability, discussing applications such as educational certifications, voting power, and social reputation tracking. By providing a low-friction implementation, ERC-5192 enables developers to create identity-based applications that are secure, verifiable, and natively compatible with existing token infrastructure, effectively expanding the utility of blockchain beyond speculative financial assets.

**Authors:** Tim Daubenschütz

**Publication:** Ethereum Improvement Proposals

**Publication date:** 2022-01-01

## Key findings

* Non-transferability is achieved through a simple and gas-efficient interface extension.
* Soulbound tokens provide a basis for decentralized identity and reputation systems.
* The standard is backwards-compatible with ERC-721 token standards.
* It addresses the specific technical need for binding digital assets to a unique identity.

## Citation

Tim Daubenschütz (2022). ERC-5192: Minimal Soulbound NFTs. Ethereum Improvement Proposals. [https://eips.ethereum.org/EIPS/eip-5192](https://eips.ethereum.org/EIPS/eip-5192)

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***

**Canonical knowledge ID:** `research:erc-5192-minimal-soulbound-nfts`