The block for which the last blockTip notification was received. It's first set when the tip is connected during node initialization. Might be unset during an early shutdown.
Declared in <node/kernel_notifications.h>
[[requires_capability(0x7f2e33c637b8)]]
std::optional<uint256>
TipBlock();The current tip block hash, or std::nullopt if it has not been set.