Nearly 20% of bitcoin traders have been hacked

"A new survey has found that 19 percent of bitcoin traders have been the victim of a hack on cryptocurrency exchanges, while 15 percent of consumers have been hit with crypto fraud.
The report, “Uncharted Territory: Why Consumers are Still Wary about Adopting Cryptocurrency,” also found that only one in ten people truly understand how cryptocurrencies work, and 29 percent have “some knowledge” of digital currencies, with that lack of knowledge stifling mainstream adoption.
In fact, 81 percent of respondents reported that they have never purchased cryptos, while 18 percent believe they are too complicated. In addition, 31 percent say that cryptocurrencies are too volatile, and 35 percent think they are nothing more than a fad."
Source:  PYMNTS, 24th June 2019

Nearly half of the ICOs launched in 2017 failed

"Of the initial coin offerings that blasted onto the scene in 2017 along with the price of bitcoin, 46 percent have failed.
That’s according to Engadget, which — citing data from TokenData — reported that of the 902 ICOs in 2017, 46 percent have failed. Among that percentage, 142 never got the funding and another 276 have faded away or were scams. What’s more, the report noted that another 113 ICOs have stopped talking about their project online or haven’t had enough adopters that success will be likely. Of the survivors, the report noted that only a few have raised more than $10 million via an ICO.
According to Engadget, excluding the ICOs that were outright scams, it’s not surprising that many of the ICOs and the virtual coins failed to take off. Many were focused on niches such as dentistry or trucking, while others were riding the coattails of other successful tokens and thus didn’t stand out enough to get traction. The report noted that ICOs remain popular this year, but there’s no guarantee that they will have a better go at it."

Source:  PYMNTS, 26th February 2018

One Bitcoin is now worth more than one ounce of gold

Source:  Techcrunch, 2nd March 2017

The daily volume of Bitcoin transactions, 2011-2015

Source:  Blog post from Coinbase, 15th July 2015

An estimated 927 people own half of all Bitcoins

"Ownership of Bitcoin appears to be highly lopsided.
This has long been a source of consternation in the Bitcoin community, and people like the FT's Izabella Kaminska have written extensively about the implications of this apparent cartel on prices — basically, they get to dictate them, and the rest of us are just price takers.
Now Finnish entrepreneur Risto Pietilä, an active member of on Bitcointalk.org, has offered an estimate of just how severe this ownership imbalance could be.
He based his calculations on data from Bitcoinrichlist.com, which has trawled through Bitcoin's master ledger — the Blockchain — to offer a rough guide to distribution as well as activity on Bitcoin exchanges.
We ran the calculations by Martti Malmi, one of Bitcoin's earliest developers, and he agreed they were basically sound. "The order of magnitude seems right," he said in an email to BI.
So, as of Dec. 3., using a price of $1,000 (which is basically where we are now), and assuming 12 million Bitcoins in circulation, here's the breakdown: 47 individuals own 28.9% of the approximately 12 million Bitcoins in existence so far. Another 880 own 21.5%, meaning 927 people control half of the entire market cap of the digital currency. Another 10,000 individuals control about a quarter. And the rest of us (around a million of us) get the crumbs (500,000 are out of circulation, whether through government seizure or people losing their passwords)."

Source:  Business Insider, 10th December 2013