CAIP-21: Asset Reference for the ERC20 Asset Namespace Source

Author Antoine Herzog, Pedro Gomes, Joel Thorstensson
Status Superseded
Type Standard
Created 2020-06-23
Updated 2020-06-23
Requires 19
Superseded By

Simple Summary

This document is about the details of the ERC20 asset namespace and reference for CAIP-19.


In CAIP-19 a general asset identification scheme is defined. This is the implementation of CAIP-19 for ERC20 (referencing erc20 tokens).


See CAIP-19.


ERC20 Asset Namespace

The asset namespace is called “erc20” as in ERC20. It reference erc20 tokens in the eip155 namespace (see CAIP3).

Asset Reference Definition

The Asset Reference format is the smart contract address of the erc20 token in the current chain_id.


The smart contract address strives for uniqueness for any erc20 tokens in the chain_id scope.

Backwards Compatibility

Not applicable

Test Cases

This is a list of manually composed examples

# DAI Token

# REQ Token

Copyright and related rights waived via CC0.


Please cite this document as:

Antoine Herzog, Pedro Gomes, Joel Thorstensson, "CAIP-21: Asset Reference for the ERC20 Asset Namespace," Chain Agnostic Improvement Proposals, no. 21, June 2020. [Online serial]. Available: