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External Initiators (Introduction)

External initiators allow jobs in a node to be initiated depending on some external condition. The ability to create and add external initiators to Chainlink nodes enables blockchain agnostic cross-chain compatibility.

Communication between External Initiators is handled by the Initiator Bridge. These bridges are defined in the bridges tab, and are the same bridges used to define external adapters.

Initiator Bridges handle the authentication to and from the External Initiator and where to send the messages. When creating a Bridge two parameters are required:
1. A Name
2. A URL

The Name is used in subsequent Job Specifications as an easy way to identify the Initiator that is triggering new Runs. The URL specifies where to send messages to the External Initiator.

When the Bridge is created it generates two pairs of credentials: Outgoing and Incoming. The Outgoing Access Key and Secret are used to authenticate messages sent from the Core to the External Initiator.

The Incoming Access Key and Secret are used to authenticate messages sent from the External Initiator to the Core.

Then, once you’ve created the name, bridge, and have the correct access keys for the URL, you can proceed to use the external initiator as if it’s a regular initiator in future job specs.

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