You can use quartz from nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z

https://github.com/greenart7c3/Amber/blob/master/app%2Fbuild.gradle#L72-L75

https://github.com/greenart7c3/Amber/blob/master/settings.gradle#L14