According to TNS Financial Services, as reported by CNN Money, 2 million households in the US alone had a net worth of at least $1 million excluding primary residences in 2005.[42] According to TNS, in mid-2006 the number of millionaire US households was 9.3 million, with an increase of half a million since 2005.[43] The study found that half of all millionaire households in the US were headed by retirees. In 2004 the United States saw a "33 percent increase over the 6.2 million households that met that criteria [sic] in 2003", fueled largely by the country's real estate boom.[44]
The bitcoin blockchain is a public ledger that records bitcoin transactions.[75] It is implemented as a chain of blocks, each block containing a hash of the previous block up to the genesis block[c] of the chain. A network of communicating nodes running bitcoin software maintains the blockchain.[32]:215–219 Transactions of the form payer X sends Y bitcoins to payee Z are broadcast to this network using readily available software applications.
Physical wallets can also take the form of metal token coins[102] with a private key accessible under a security hologram in a recess struck on the reverse side.[103]:38 The security hologram self-destructs when removed from the token, showing that the private key has been accessed.[104] Originally, these tokens were struck in brass and other base metals, but later used precious metals as bitcoin grew in value and popularity.[103]:80 Coins with stored face value as high as ₿1000 have been struck in gold.[103]:102–104 The British Museum's coin collection includes four specimens from the earliest series[103]:83 of funded bitcoin tokens; one is currently on display in the museum's money gallery.[105] In 2013, a Utahn manufacturer of these tokens was ordered by the Financial Crimes Enforcement Network (FinCEN) to register as a money services business before producing any more funded bitcoin tokens.[102][103]:80
Bitcoin is a digital currency, sometimes referred to as a cryptocurrency, best known as the world's first truly decentralized digital currency. Bitcoin is traded on a peer-to-peer basis with a distributed ledger called the Blockchain, and the Bitcoin exchange rate to the US Dollar and other major currencies is determined by supply and demand as with other global exchange rates. The traded value of Bitcoin has proven volatile through various booms and busts in demand. Ultimately, however, many see Bitcoin as a store of value against government-backed fiat currencies.
Fashion icon Gloria Vanderbilt has died Gloria Vanderbilt, the last of a Gilded Age clan of millionaires, an early inventor of designer jeans and the mother of CNN's Anderson Cooper, died. — Kirkpatrick Bado, USA TODAY, "Heiress lived life 'on her own terms'," 17 June 2019 San Francisco companies Lyft, Uber and Pinterest have gone public this year, driving up fears that masses of millennial millionaires will take up all the city’s already scarce housing. — Washington Post, "Film captures the loss of black San Franciscans," 7 June 2019 Sanders in fact has a net worth below that of a millionaire. — Nina Burleigh, Newsweek, "Can Bernie Sanders Beat Hillary Clinton?," 8 Apr. 2015 But in the mega-millionaire world of pro sports, the bottom line is production on the field. — Terry Pluto, cleveland.com, "Cleveland Browns & Odell Beckham: What really matters? – Terry Pluto," 7 June 2019 Described by People as a multi-millionaire property tycoon, Mozzi made his first public appearance with Beatrice at London's National Portrait Gallery Gala on March 12, 2019. — Amy Mackelden, Harper's BAZAAR, "Princess Beatrice and Her Boyfriend Couple Up at Lady Gabriella Windsor's Wedding," 18 May 2019 Except for your friends don't hook you up with millionaires, and the creepy guys in your Instagram DMs almost certainly don’t include a Jonas brother. — Lucy Wood, Marie Claire, "Sophie Turner Reveals the Super Normal Way She and Joe Jonas First Met," 1 Apr. 2019 The coat is estimated to bring in between $20,000 and $30,000, which doesn’t exactly make this piece of vintage accessible to non-millionaire Basquiat fans. — Brooke Bobb, Vogue, "If You’ve Got $20,000 to Spare, You Can Own Jean-Michel Basquiat’s Favorite Comme des Garçons Coat," 2 Nov. 2018 The Bush family settled on the city’s west side, which would soon have America’s largest concentration of oil millionaires. — Russell Gold, WSJ, "In Houston, His Adopted Home, George H.W. Bush Was Beloved," 2 Dec. 2018

The proof-of-work system, alongside the chaining of blocks, makes modifications of the blockchain extremely hard, as an attacker must modify all subsequent blocks in order for the modifications of one block to be accepted.[87] As new blocks are mined all the time, the difficulty of modifying a block increases as time passes and the number of subsequent blocks (also called confirmations of the given block) increases.[75]
The one and only, the first and most famous cryptocurrency. Bitcoin serves as a digital gold standard in the whole cryptocurrency-industry, is used as a global means of payment and is the de-facto currency of cyber-crime like darknet markets or ransomware. After seven years in existence, Bitcoin‘s price has increased from zero to more than 650 Dollar, and its transaction volume reached more than 200.000 daily transactions.
Bitcoin is pseudonymous rather than anonymous in that the cryptocurrency within a wallet is not tied to people, but rather to one or more specific keys (or "addresses").[41] Thereby, bitcoin owners are not identifiable, but all transactions are publicly available in the blockchain. Still, cryptocurrency exchanges are often required by law to collect the personal information of their users.
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