odpovede najdes tu:
https://www.reddit.com/r/Bitcoin/comments/6tucuh/announcing_blockstream_satellite/

"How does the initial sync works? Do the satelites constantly Broadcast the whole blockchain? Sending 150GB via Satellit musst take ages?

Right now we're not doing initial sync-- just redundant transmission of recent blocks. With our existing signals you can set up the dish to start getting blocks, then have someone ship you a hard-drive or bluray disk with the history. (Or sync it from an expensive terrestrial internet connection that you'd prefer to not use actively going forward)
In the future it's likely Bitcoin nodes will support a sync from UTXO set, with that we would likely be able to do a sync over the sat with a week or two synctime. Perhaps faster if we're able to extract more bandwidth from the sat when we get more testing feedback from people."