1. Timespan Intervals
2. Adding a fee to a bitcoin transaction bumps that transaction up in the queue. Those who do not pay a fee, or do not pay a sufficiently big fee, can wait hours or even days for their transaction to complete. See e.g., fluffy1337, PSA: Due to Delays, If you Buy Bitcoins Make Sure to Keep Them On An Exchange or They May Get Stuck in Transit for a While;See Ryan Browne;Big Transaction Fees are a Problem for Bitcoin-but There Could Be a Solution, CNBC,2016
3. SegWit2x's Failure Confirms Bitcoin's Status as Digital Gold;Darryn Pollock;COINTELEGRAPH,2017
4. Bitcoin's most important characteristic is that it is decentralized. No single institution controls the bitcoin network. It is maintained by a group of volunteer coders, and run by an open network of dedicated computers spread around the world;See;17. SATOSHI NAKAMOTO, BITCOIN: A PEER-TO-PEER ELECTRONIC CASH SYSTEM,1998
5. Identity Theft, Privacy, and the Architecture of Vulnerability