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RE: I once had a great idea for a time travel novel, but I will probably never write it.
Funny, I'm in a similar boat. I'll never write the story, but I've mused on it occasionally. For me, the beacon was always a vacuum sealed warehouse 10m x 10m x 10m.
Start of the story, some boffin works out that colliding with air molecules will destroy any time machine going back, so he builds the warehouse, and posts the co-ordinates on the bitcoin blockchain.
One confirmation later, a time traveller arrives.