No internet. No smartphone.
One message tells your family you're alive.
Amrao Achi Grid is a distributed, privacy-preserving check-in network for internet shutdowns and disasters. আমরাও আছি — send a short SMS, and the record survives even if the node that received it goes down.
Simulated sender
Gateway trust level
The plan requires rejecting alphanumeric or application-originated sender IDs as identity proof. Try ACHI on the untrusted route to see the check-in refused.
Design principles
Feature-phone first
Every core action works over ordinary SMS — no smartphone, no app store, no data plan.
Offline-first nodes
Independent relay nodes accept, queue, and answer check-ins even while cut off from the internet.
Minimal disclosure
A lookup confirms safety and time only — never exact location, medical status, or movement history.
No single point of failure
Events replicate across nodes and transports, so one server, gateway, or operator can go down safely.
Appendix B · Command reference
Every command works from a basic feature phone
| Command | Purpose |
|---|---|
| SHURU <secret> | Register this number and set your family secret |
| ACHI <secret> [area] | Record that you are safe right now |
| KHOJ <phone> <secret> | Ask if someone has checked in safe |
| NIKHOJ <phone> <notes> | Open a private missing-person case |
| BISHWAS <phone> <secret> | Add a trusted recovery contact |
| NOTUN <code> <new secret> | Reset your secret with a recovery code |
| MUCHUN <secret> | Remove your active record |
| SAHAJJO / 0 | Get help in Bangla or English |
Numeric aliases: 1 <secret> for ACHI, 2 <phone> <secret> for KHOJ, and 0 for help — for low-literacy and non-Latin-keyboard users.