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Bitcoin is a digital asset and a payment system invented by Satoshi Nakamoto. Nakamoto introduced the idea on 31 October 2008 to a cryptography mailing list, and released it as open-source software in 2009. There have been several high profile claims to the identity of Satoshi Nakamoto; however, none of them have provided proof beyond doubt that back up their claims.

The system is peer-to-peer and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called the blockchain, which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasury categorizes bitcoin as a decentralized virtual currency. Bitcoin is often called the first cryptocurrency, although prior systems existed and it is more correctly described as the first decentralized digital currency. Bitcoin is the largest of its kind in terms of total market value.

Bitcoins are created as a reward for payment processing work in which users offer their computing power to verify and record payments into a public ledger. This activity is called mining and miners are rewarded with transaction fees and newly created bitcoins. Besides being obtained by mining, bitcoins can be exchanged for other currencies, products, and services. When sending bitcoins, users can pay an optional transaction fee to the miners.

In February 2015, the number of merchants accepting bitcoin for products and services passed 100,000. Instead of 2–3% typically imposed by credit card processors, merchants accepting bitcoins often pay fees in the range from 0% to less than 2%. Despite the fourfold increase in the number of merchants accepting bitcoin in 2014, the cryptocurrency did not have much momentum in retail transactions. The European Banking Authority and other sources have warned that bitcoin users are not protected by refund rights or chargebacks. The use of bitcoin by criminals has attracted the attention of financial regulators, legislative bodies, law enforcement, and media. Criminal activities are primarily centered around darknet markets and theft, though officials in countries such as the United States also recognize that bitcoin can provide legitimate financial services.

Bitcoin miner generated spurious emissions in 700MHz, disrupting T-Mobile LTE.
Vice-chair of Berkshire Hathaway: “Bitcoin is noxious poison.“
Goncalo Esteves sobbed as he was sentenced A 24-year-old Essex man behind the reFUD.me antivirus evasion site, who made an estimated half a million pounds from Bitcoin, has been jailed for two years.…
The technology behind the cryptocurrency bitcoin is one of the internet's most promising new developments. Here's how businesses can use it to streamline operations and create new opportunities.
Cisco Talos says the gang responsible has managed to steal millions of dollars through phishing campaigns.

Spam and phishing in 2017

The share of spam in email traffic in 2017 fell by 1.68% to 56.63%.

The lowest share (52.67%) was recorded in December 2017.

The highest (59.56%) belonged to September.
In 2017, the Anti-Phishing system was triggered 246,231,645 times on computers of Kaspersky Lab users as a result of phishing redirection attempts.
Top officials from Bundesbank, ECB push for the necessity of fiat currency.
A new Lazarus Group cyberattack campaign combines spear-phishing techniques with a cryptocurrency scanner designed to scan for Bitcoin wallets.
New 'HaoBao' campaign also plants the seeds for additional espionage on targeted machines.
“I could not have predicted this trendmdash;but then bitcoin skyrocketed.”
By understanding how cybercriminals use bitcoin, threat analysts can connect the dots between cyber extortion, wallet addresses, shared infrastructure, TTPs, and attribution.