CoinNess.com Market Surveillance June 28: BTC Price Stands Above The $11800 Level
As of 11:00 (UTC) on June 28, the global index of Bitcoin (BTC) price is standing above $11,800, now marking $11,867.44, with a decrease of 0.39% in the past 24 hours. 
The CoinNess.com Bullish vs. Bearish Indicator shows our four-hour technical bias on BTC is "Buy" with four indicators sending out a selling signal, five showing a neutral signal, and nine indicating a buying signal.
The broad market is trading sideways, with 47 out of Top 100 cryptos by market cap rising.
The global market cap reads $335.93 billion, and the 24-hour trading volume is $115.84 billion.
Major Coins 
1. BTC quotes show 11,940.26 USDT on Binance, $11,819 on Bitfinex and $10,811.46 on Coinbase Pro; 
2. CoinNess.com Market Index presents quotes for major cryptocurrencies besides BTC as following:
CoinNess.com Market Index presents quotes for major cryptocurrencies besides BTC as following:
ETH marks $307.76 (-1.17%);
XRP marks $0.415 (-2.95%);
BCH marks $427.07 (-1.88%);
LTC marks $118.03 (+0.21%);
EOS marks $6.05 (-4.93%);
ETC marks $7.93 (-2.68%).  
 

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1. The latest Polkadot token sale has distributed 500,000 DOTs at a 'successful' value, the protocol's managing partner Web3 Foundation (W3F) has told The Block.
Although the foundation did not specify how much it had raised, the sale is said to be on track with the protocol’s $1.2 billion valuation reported by the WSJ earlier this year. The latest round saw the foundation liquidate and sell 5% of the total token supply, meaning Polkadot’s managing team would have expected to raise $60 million, although it did not confirm the figure.                                                     
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2. The deputy governor of the Bank of Uganda has warned the public about the limited protections offered them when they invest in unregulated cryptocurrencies.
English-language Ugandan daily New Vision reports on June 28 that the bank's deputy governor - Dr. Louis Kaskende - made his remarks during a Town Hall meeting in the city of Masaka, which was devoted to educating the public about the institution's activities and role.

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3. An incredible $1.7 billion worth of Bitcoin contracts exchanged hands on CME this Thursday on June 27, breaking all records for futures.
That's the highest level it has ever been both in terms of the number of contracts exchanged, 29,225, as well as in term of value traded.                                             
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1. Seven more Japanese banks have joined the SBI Ripple Asia's Money Tap money transfer platform. An SBI Group portal press release made on June 26 mentioned Chikubo, Ashiga, Towa, Shimane, Toho and Fukushima Banks as the new entrants.

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 2. Beijing Internet Finance Industry Association released an article reminding investors to establish healthy investing concept and enhance risk awareness. The Association proposed that members and social institutions should strengthen self-discipline, resist illegal financial activities, and not participate in any illegal financial activities, such as ICO and the hype of "virtual currency."                                                             
                                                                                                      Read More  3. DAppShield, risk control platform of the China-based blockchain security firm PeckShield, monitored that between 16:00 and 19:00 UTC on June 27, the address starting with TM66Bg has initiated 'transaction rollback' attacks on SPOKpark, an TRON-based DApp game, through creating multiple contracts. By taking advantage of the attack, 50,845 TRX were hacked in total. Currently, the balance of its spearhead contract has reduced to zero, and the website is inaccessible.
The security personnel of PeckShield analyzed the incident, believing that the draw of SPOKpark was carried out on the chain and within the same transaction, so it was vulnerable to the rollback attack.                                                                                                                                                                                
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Question: 

What Is The Definition of 51% Attack?

Answer: 

51% attack refers to an attack on a blockchain – usually bitcoin's, for which such an attack is still hypothetical – by a group of miners controlling more than 50% of the network's mining hashrate, or computing power. The attackers would be able to prevent new transactions from gaining confirmations, allowing them to halt payments between some or all users. They would also be able to reverse transactions that were completed while they were in control of the network, meaning they could double-spend coins.
They would almost certainly not be able to create a create new coins or alter old blocks, so a 51% attack would probably not destroy bitcoin or another blockchain-based currency outright, even if it proved highly damaging.