Historically, Provider implementations have exhibited conflicting interfaces and behaviors between wallets. This working group formalizes an Bitcoin extension API to promote wallet interoperability. The API is designed to be minimal, event-driven, and agnostic of transport and RPC protocols. Its functionality is easily extended by defining new RPC methods and message event types.
Historically, providers have been made available as
window.webln in web browsers, but this convention is not part of the specification.
A list of current work in progress can be tracked from the issues tab in the playground repository, which includes a functional spec demonstration. A hosted instance of the demo can be found here together with the accompanying specification documentation.