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Noob question here. Is it possible to send bitcoin transactions using Blockstream Satellite node or is it used only for receiving blocks?

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    Not your question, but you can send bitcoin transactions via SMS. This combined with the satellite download could build a bitcoin system for those without highspeed internet. – Dan Dec 12 '18 at 17:07
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No, communication is unidirectional, you can only receive the data which is broadcast by the system. The satellites being used are TV relays, the uplink essentially being amplified and re-broadcast without any knowledge of the content.Transaction broadcast needs to happen by terrestrial services like a cellphone network, dialup modem, or just the regular internet.

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