EIP 634: Storage of text records in ENS Source

AuthorRichard Moore
TypeStandards Track


This EIP defines a resolver profile for ENS that permits the lookup of arbitrary key-value text data. This allows ENS name holders to associate e-mail addresses, URLs and other informational data with a ENS name.


There is often a desire for human-readable metadata to be associated with otherwise machine-driven data; used for debugging, maintenance, reporting and general information.

In this EIP we define a simple resolver profile for ENS that permits ENS names to associate arbitrary key-value text.


Resolver Profile

A new resolver interface is defined, consisting of the following method:

function text(bytes32 node, string key) constant returns (string text);

The interface ID of this interface is 0x59d1d43c.

The text data may be any arbitrary UTF-8 string. If the key is not present, the empty string must be returned.

Keys must be made up of lowercase letters, numbers and the hyphen (-). Vendor specific services must be prefixed with vnd..

  • email - an e-mail address
  • url - a URL
  • avatar - a URL to an image used as an avatar or logo
  • description - A description of the name
  • notice - A notice regarding this name;
  • keywords - A list of comma-separated keywords, ordered by most significant first; clients that interpresent this field may choose a threshold beyond which to ignore

  • vnd.github - a GitHub username
  • vnd.peepeth - a peepeth username
  • vnd.twitter - a twitter username

Usernames SHOULD not be prefixed with the @ symbol.


Application-specific vs general-purpose record types

Rather than define a large number of specific record types (each for generally human-readable data) such as url and email, we follow an adapted model of DNS’s TXT records, which allow for a general keys and values, allowing future extension without adjusting the resolver, while allowing applications to use custom keys for their own purposes.

Backwards Compatibility

Not applicable.

Test Cases



None yet.

Copyright and related rights waived via CC0.