jm õR-t«q©¼ãKcÓ]pZ«¾&/Ó
ÙaúËL¢bitcoin runs totally based on software, except the asic miner. upgrade is an easy thing, just change or add a few lines of code will not cause someone lose money.
https://whatsonchain.com/tx/77a971140f48e5a1f25a5d9c92a80e5c44edd9a4f9e0d8af632896626d67c629