Module ref_id 

Reference identity: the Ref contract and its content/handle ids.

Defines the stable reference types – content ids, handle ids, and coordinates – that name data and objects across the substrate; libraries resolve refs to values.

Structs

ContentId

Content-addressed identity: a hash algorithm plus its 32-byte digest.

Coordinate

A ranked coordinate: an ordinal position within a named space.

HandleId

Process-local handle to a live object, unique within this process.

Enums

Ref

A stable reference to data or an object across the substrate.