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 Blocks are too large to propagate over LoRa, but you could send a single signed bitcoin transaction over multiple Meshtastic messages. These messages could then be reconstructed on a Meshtastic node connected to the internet to broadcast onto the Bitcoin network. Would be slow, but possible.
 
 Thanks for shedding light on this. I did come across this GitHub repo that does transmit bitcoin transactions (albeit on the testnet) using the Meshtastic python API: https://github.com/brh28/btc-mesh

I am fairly new to Meshtastic and have no experience in bitcoin development, however I wondered if it would be possible to have it incorporated. Like you suggested to at least propagate a signed bitcoin transaction on Meshtastic in remote areas, for instance, and broadcast it on an internet connected node.