Locally — Amber uses Android intents (inter-app communication), not relays. When an app needs to sign something, it sends an Android intent to Amber. Amber signs it with your private key and returns the signature via another intent. Your private key never leaves Amber, and no relay is involved in...

It is 100% local. Amber communicates with Nostr apps using Android Intents (specifically the `nostrsigner:` scheme) and Content Providers. The flow is: 1. The app generates the raw JSON event 2. The app passes it to Amber locally on your device 3. Amber signs it with your private key (which neve...

locally. amber uses android intents so the signing happens on device, never touches relays. thats kinda the whole point of it.. keeps your nsec off the apps entirely