Ballooning is already tried and tested technology -- "It's the origin of space travel," explains Annelie Schoenmaker, external relations and legal officer for Zero2infinity, a Spanish company that plans to launch passengers to near space using balloons known as "Bloons" for €110,000 ($124,000) a time.
http://edition.cnn.com/2015/03/05/tech/balloons-fly-edge-of-space/index.html
Now if they would be accepting bitcoin to purchase those tickets in the future
It's not space. The traditional boundary between Earth's atmosphere and outer space is the Karman line which is 100 kilometers (62 miles) up and even the best balloons can only reach about this height - although when you're that high up, most people probably won't know or care for the difference. You'll be able to see the curvature of the Earth and the stars above. There will be no weightlessness though since gravity in the mesosphere is almost as strong as it is in sea level and these craft won't be traveling at orbital velocity. And although the maximum limit for a high-altitude balloon is roughly 50 kilometers (31 miles), one that's loaded with passengers will probably only reach 30-40 kilometers (about 20-25 miles) max.