[#interfaces-BlockRef]
= xref:interfaces.adoc[interfaces]::BlockRef
:relfileprefix: ../
:mrdocs:

A lightweight reference to a block by hash and height.

== Synopsis

Declared in `<interfaces/types.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct BlockRef;
----

== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:node/GetTip.adoc[`::node::GetTip`]
| Return the hash and height of the active chain tip.
| xref:node/WaitTipChanged.adoc[`::node::WaitTipChanged`]
| Waits for the connected tip to change until timeout has elapsed. During node initialization, this will wait until the tip is connected (regardless of `timeout`). Returns the current tip, or nullopt if the node is shutting down or interrupt() is called.
|===


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