A Bloomberg columnist asks whether this week's rise in bitcoin's price is a turning point -- or just a "dead cat bounce"? After hitting a year's low of about $3,143, down about 80 percent from January highs, Bitcoin has risen 27 percent this week. Short-sellers are closing their positions, while fans smell fresh opportunity. Even more eye-watering market moves are happening elsewhere in the digital currency's ecosystem. Bitcoin Cash, a spin-off intended to be more usable as a payments mechanism, has almost tripled this week from about $80 to $225. That this is happening at the same time as a U.S. stock-market selloff will no doubt warm the hearts of crypto-evangelists, who believe their currencies offer genuine alternatives for where to put money in times of trouble....

A cursory glance at the price of Bitcoin Cash over the past year shows that it has fallen about 95 percent from its December 2017 record. So, anyone refusing to crystallize their losses this year has seen their 98-percent loss narrow over the past few days to, well, 95 percent. Celebrating now is like the Monty Python knight calling it a draw after losing all his limbs. It's not entirely clear either what kind of investor has the appetite, let alone the resources, to make meaningful bets on digital currencies today after a boom-and-bust cycle driven entirely by speculative hype rather than the adoption of Bitcoin in the real world. The long-awaited wave of money from Wall Street looks as far away as ever. So we're probably getting back to more natural territory for crypto: True believers and small-time gamblers.
Their conclusion? "One still can't rule out that these particular crypto-cats are dead."

Cryptocurrency prices "fell sharply on Friday, as another bout of selling took digital currencies to fresh lows," reports MarketWatch, adding that Friday the price of Bitcoin "crashed through support at $3,500, falling more than 10% to a 15-month low at $3,230 on the Kraken exchange."

"What a difference a year makes," CNN Business quipped Friday, in an article headlined "Bitcoin's Epic Plunge Continues": In December 2017, bitcoin prices hit a record high of just under $20,000... Bitcoin is at a 15-month low. But prices have really gotten whacked this week, falling nearly 20% in just the past five days alone. Bitcoin isn't the only cryptocurrency getting hit either. Ripple/XRP, ethereum, stellar, litecoin and numerous other cryptocurrencies have plunged in the past week.

Little tangible news can explain or justify the current crypto carnage. One possible reason is that a pro-crypto member of the Securities and Exchange Commission warned at a conference this week that she's fighting an uphill battle trying to convince the rest of the SEC to approve more bitcoin exchange traded funds.... Nearly two-thirds of money managers surveyed by asset management firm Natixis still thought that cryptocurrencies were a bubble, the firm reported this week.
"In my opinion, bitcoin is dead," wrote the CEO of one wealth management firm with more than $32 billion in assets. It won't go quietly, but the recent precipitous drop may be the beginning of its inevitable and inexorable death spiral. Or there could be a dead cat bounce. Either way, I see bitcoin as a dead man walking. Future generations may read about bitcoin in a finance textbook as a curiosity and wonder what all the fuss was about. There are still some die-hard adherents espousing the virtues of bitcoin, desperate to make a silk purse out of a sow's ear. Unfortunately for them, the end may not be pretty when it comes.

Proponents of bitcoin tend to focus on the impact of the blockchain technology that drives it, and make no mistake, blockchain is the real deal. Blockchain is fundamentally changing the way industries do business, from traditional banking to supply chain management. But just because blockchain technology is creating a new paradigm doesn't mean that bitcoin shares that same distinction.... Most cryptocurrency transactions are purely speculative. There are no real fundamentals to evaluate; bitcoin doesn't produce any products or services, hire any employees or pay any dividends. The only way profits are generated is when the owner is lucky enough to find someone else who will pay more for the thing...

The minute bitcoin or any other cryptocurrency appears to have even the slightest chance of disrupting national monetary supply, I expect regulation to be swift and decisive. The SEC has already issued guidance around cryptocurrencies that has created roadblocks to gaining the same legitimacy as traditional marketable securities... If you enjoy the thrill of making bets, I suggest you visit your favorite sports book or table game in Vegas where your odds of success are much higher.

Zorro shares a report from BloombergQuint: The Great Crypto Crash of 2018 looks more and more like one for the record books. As virtual currencies plumbed new depths on Wednesday, the MVIS CryptoCompare Digital Assets 10 Index extended its collapse from a January high to 80 percent. The tumble has now surpassed the Nasdaq Composite Index's 78 percent peak-to-trough decline after the dot-com bubble burst in 2000. Like their predecessors during the Internet-stock boom almost two decades ago, cryptocurrency investors who bet big on a seemingly revolutionary technology are suffering a painful reality check, particularly those in many secondary tokens, so-called alt-coins.

"It just shows what a massive, speculative bubble the whole crypto thing was -- as many of us at the time warned," said Neil Wilson, chief market analyst in London for Markets.com, a foreign-exchange trading platform. "It's a very likely a winner takes all market -- Bitcoin currently most likely." Wednesday's losses were led by Ether, the second-largest virtual currency. It fell 6 percent to $171.15 at 7:50 a.m. in New York, extending this month's retreat to 40 percent. Bitcoin was little changed, while the MVIS CryptoCompare index fell 3.8 percent. The value of all virtual currencies tracked by CoinMarketCap.com sank to $187 billion, a 10-month low. "Crypto bulls dismiss negative comparisons to the dot-com era by pointing to the Nasdaq Composite's recovery to fresh highs 15 years later, and to the internet's enormous impact on society," reports BloombergQuint. "They also note that Bitcoin has rebounded from past crashes of similar magnitude. But even if the optimists prove right and cryptocurrencies eventually transform the world, this year's selloff has underscored that progress is unlikely to be smooth."

An anonymous reader quotes a report from Bloomberg: The cryptocurrency bear market plumbed a fresh 10-month low on Monday as Bitcoin's biggest rival tumbled and U.S. regulators suspended trading in two securities linked to digital assets. Ether, the second-largest virtual currency, slumped 11 percent from its level at 5 p.m. New York time on Friday, according to Bloomberg composite pricing. Bitcoin declined 2.4 percent, while the market capitalization of digital assets tracked by CoinMarketCap.com shrank to about $197 billion -- down almost $640 billion from its January peak. Cryptocurrencies have declined for five of the past six weeks amid concern that a broader adoption of digital assets will take longer than some had anticipated. That worry was underscored over the weekend after the U.S. Securities and Exchange Commission temporarily suspended trading in two exchange-traded notes linked to cryptocurrencies and Ethereum co-founder Vitalik Buterin told Bloomberg that the days of explosive growth in the blockchain industry have likely come and gone.

schwit1 shares a report from MIT Technology Review: Blockchain technology can eliminate the need for companies and other organizations to maintain centralized repositories of identifying information, and users can gain permanent control over who can access their data (hence "self-sovereign"), says Drummond Reed, chief trust officer at Evernym, a startup that's developing a blockchain network specifically for managing digital identities. Self-sovereign identity systems rely on public-key cryptography, the same kind that blockchain networks use to validate transactions. Although it's been around for decades, the technology has thus far proved difficult to implement for consumer applications. But the popularity of cryptocurrencies has inspired fresh commercial interest in making it more user-friendly.

Public-key cryptography relies on pairs of keys, one public and one private, which are used to authenticate users and verify their encrypted transactions. Bitcoin users are represented on the blockchain by strings of characters called addresses, which are derived from their public keys. The "wallet" applications they use to hold and exchange digital coins are essentially management systems for their private keys. Just like a real wallet, they can also hold credentials that serve as proof of identification, says Reed. Using a smartphone or some other device, a person could use a wallet-like application to manage access to these credentials. But will regular consumers buy in? Technologists will need to create a form factor and user experience compelling enough to convince them to abandon their familiar usernames and passwords, says Meltem Demirors, development director at Digital Currency Group, an investment firm that funds blockchain companies. The task calls for reinforcements, she says: "The geeks are working on it right now, but we need the designers, we need the sociologists, and we need people who study ethics of technology to participate."

An anonymous reader quotes a report from The Verge: The group responsible for last week's globe-spanning ransomware attack has made their first public statement. Motherboard first spotted the post, which was left on the Tor-only announcement service DeepPaste. In the message, the Petya authors offer the private encryption key used in the attack in exchange for 100 bitcoin, the equivalent of over $250,000 at current rates. Crucially, the message includes a file signed with Petya's private key, which is strong evidence that the message came from the group responsible for Petya. More specifically, it proves that whoever left the message has the necessary private key to decrypt individual files infected by the virus. Because the virus deleted certain boot-level files, it's impossible to entirely recover infected systems, but individual files can still be recovered. The message also included a link to a chat room where the malware authors discussed the offer, although the room has since been deactivated.

Joseph Cox, reporting for Motherboard: On Tuesday, a new, worldwide ransomware outbreak took off, infecting targets in Ukraine, France, Spain, and elsewhere. The hackers hit everything from international law firms to media companies. The ransom note demands victims send bitcoin to a predefined address and contact the hacker via email to allegedly have their files decrypted. But the email company the hacker happened to use, Posteo, says it has decided to block the attacker's account, leaving victims with no obvious way to unlock their files. [...] The hacker tells victims to send $300 worth of bitcoin. But to determine who exactly has paid, the hacker also instructs people to email their bitcoin wallet ID, and their "personal installation key." This is a 60 character code made up of letters and digits generated by the malware, which is presumably unique to each infection of the ransomware. That process is not possible now, though. "Midway through today (CEST) we became aware that ransomware blackmailers are currently using a Posteo address as a means of contact," Posteo, the German email provider the hacker had an account with, wrote in a blog post. "Our anti-abuse team checked this immediately -- and blocked the account straight away.

A massive cyber attack has disrupted businesses and services in Ukraine on Tuesday, bringing down the government's website and sparking officials to warn that airline flights to and from the country's capital city Kiev could face delays. Motherboard reports that the ransomware is quickly spreading across the world. From a report: A number of Ukrainian banks and companies, including the state power distributor, were hit by a cyber attack on Tuesday that disrupted some operations (a non-paywalled source), the Ukrainian central bank said. The latest disruptions follow a spate of hacking attempts on state websites in late-2016 and repeated attacks on Ukraine's power grid that prompted security chiefs to call for improved cyber defences. The central bank said an "unknown virus" was to blame for the latest attacks, but did not give further details or say which banks and firms had been affected. "As a result of these cyber attacks these banks are having difficulties with client services and carrying out banking operations," the central bank said in a statement. BBC reports that Ukraine's aircraft manufacturer Antonov, two postal services, Russian oil producer Rosneft and Danish shipping company Maersk are also facing "disruption, including its offices in the UK and Ireland."

According to local media reports, the "unknown virus" cited above is a ransomware strain known as Petya.A. Here's how Petya encrypts files on a system (video). News outlet Motherboard reports that Petya has hit targets in Spain, France, Ukraine, Russia, and other countries as well. From the report: "We are seeing several thousands of infection attempts at the moment, comparable in size to Wannacry's first hours," Costin Raiu, a security researcher at Kaspersky Lab, told Motherboard in an online chat. Judging by photos posted to Twitter and images provided by sources, many of the alleged attacks involved a piece of ransomware that displays red text on a black background, and demands $300 worth of bitcoin. "If you see this text, then your files are no longer accessible, because they are encrypted," the text reads, according to one of the photos. "Perhaps you are busy looking for a way to recover your files, but don't waste your time. Nobody can recover your files without our decryption service."

An anonymous reader writes: Monday marks the seven-year anniversary of Bitcoin Pizza Day -- the moment a programmer named Laszlo Hanyecz spent 10,000 bitcoin on two Papa John's pizzas. More important than the episode being widely recognized as the first transaction using the cryptocurrency is what it tells us about the bitcoin rally that saw it break through the $2,100 mark on Monday. Bitcoin was trading as high as $2,185.89 in the early hours of Monday morning, hitting a fresh record high, after first powering through the $2,000 barrier over the weekend, according to CoinDesk data. Throughout the weekend, the value of cryptocurrency was looming around $2,000.