Espresso
Sign a DeFi transaction on an offline, low cost ESP32 and beam it to the chain over a satellite network, from a remote village, a disaster zone, or a censored network, with no internet and no cell coverage.
02 The problem
Signing is solved. Getting the signed bytes out is not.
No internet means no access to on chain capital, so billions stay locked out of DeFi. Wallets assume the internet is nearby. Ships at sea, disaster zones, remote villages, and censored networks have a clear view of the sky long before they have any IP connectivity. A satellite can reach them when nothing else can.
03 The solution
Sign → Beam → Transact
The user signs a normal EVM transaction offline. Espresso only transports and submits the serialized transaction. Audit is separate, queryable, and signed by the station.
04 The device
Turns any device into a remote control for DeFi.
An ultra cheap ESP32 turns any device into a remote control for Uniswap, Aave, or Polygon, even in deserts or blackouts.
05 Arkiv integration
Arkiv holds the signed tx, not just the receipt.
A scheduled tx is written to Arkiv as a queued entity before it broadcasts, so the signed tx is durable and queryable. On restart the station reloads its queued entities and relays each when due.
Durable queue
Queued entities live on Arkiv, so received → queued → submitted → confirmed survives a restart.
Queried by attribute
arkiv_query filters on project and kind. Recovery adds status=queued and trusts only the station wallet's entities.
Expiring history
Entities carry a 30 day time to live, so the trail stays recent history, not permanent storage.
06 Transport
Built for the satellite network.
Primary satellite uplink
The device sends binary payloads up to the satellite network and reads downlink frames back. Global coverage, pole to pole, with only sky in view.
LoRa SX1276 fallback
When a ground receiver is in range, the same frames go over a 915 MHz long range link with kilometres of reach below the 192 byte MTU, reassembled with CRC16 checks. The radio rides on a low cost, low power ESP32.
Serial bridge
A receiver ESP32 forwards decoded satellite or LoRa frames to the ground station.
07 Impact
Activating finance for the world's remote users.
Disaster proof liquidity in remote villages or blackouts.
Censorship resistant trades from anywhere on Earth.
Future: smartwatches to global emergency finance.
08 Close