get https://api.zan.top/node/v1/eth/mainnet//eth/v1/beacon/light_client/finality_update
Get the latest known LightClientFinalityUpdate.
Requests the latest LightClientFinalityUpdate known by the server.
Depending on the Accept header it can be returned either as JSON or SSZ-serialized bytes.
Servers SHOULD provide results as defined in create_light_client_finality_update.