The reason behind falling Bitcoin price is the news from China.

1. China banned all ICO’s and this news hit hard on the Crypto market, within one day the cryptocurrency market lost 20 Billion Dollars and on the very next day market showed some growth.

2. The second news is again from China in which it stated that China is planning to ban all Cryptocurrencies exchange platforms. This news again hit hard on the market.

The Cryptocurrency market is volatile right now and all positive and negative news will create some impact on the market and it will see up and down in future. I am not a financial adviser and this is not a financial advice but what I think is the cryptocurrency market is just started. We are going to see some more development in future and increase in market capitalization.

I own some Bitcoin and I am not going to sell it before 31st December 2020. Right now the market is going through a tough phase. Give it some time to recover and HODL your Bitcoins.

India is yet to come out with a mandate deciding the future of Bitcoins in India. This information of bitcoin ban in India is nothing more than FUD. The final stand of Indian govt on Bitcoin transaction is not yet out. However, in the recent news, SEBI chief, Mr. Ajay Tyagi stated that Crypto regulations in India should be out soon and the role various regulators are being finalized. So it’s clear that they are planning to experiment with it and has taken a wait and watch approach.

Governments can ban anything within their borders. If so, you wouldn't be able to legally transact using bitcoins without some penalty if you get caught. Perhaps there are dark markets where you wouldn't be caught, but this would severely limit Bitcoin adoption within that country.

If bitcoin replaces fiat it won't perform better than stocks. Think about it. What value does Bitcoin create at that point? What value does a company create? As adoption grows Bitcoin should outpace stocks. If adoption stops it doesn't go up in value.

ou can follow any good youtube channel to learn about crypto currency or you can go through any of the free online crypto currency course where expert trader will guide you about each term of crypto, things you should take care of before investing into crypto etc.

I would personally recommend you to go for any of 3–4 hours course of Udemy and after completion, you will also get certificate which will add value in your profile.

Eligius
Eligius is an open mining pool that can be joined by anyone without registration. Unlike other bitcoin mining pools, Eligius doesn’t charge fees, and it manages under the CPPSRB reward system at 100 percent value. Miners are typically paid directly from the block reward, which means that Eligius almost never keeps any funds in its internal wallet, making it highly transparent and unattractive to hackers. Because Eligius isn’t profitable for its operators, it offers only basic functionality.

In India, bitcoin trade is carried by unregulated digital exchanges that are 11 in number according to Tax Department estimates. People are investing in money expecting huge returns as Bitcoin registered a price increase from just $1000 in January 2017 to $15000 at the end of 2017.

But anytime a burst can happen. In that case, investors will lose their money. As Bitcoin has entered a bubble phase and speculators have shown big interest in several other crypto variants, the RBI and Finance Ministry have come with timely warnings against dealing with crypto currencies.

The RBI as the central Bank issues money/payment related warnings on VCs. Regarding the asset/trading security side, the government and SEBI are giving their own cautions. Similarly, the tax Department is scrutinising the actions by investors to check the tax implications.

you may want to rephrase your question because it isn’t very clear what you’re asking.
why it’s not clear? because once an address belongs to a wallet, it will forever belong to that wallet, so “used to” is not a tense that applies
that aside, the only way an address can be verified as belonging to a wallet (which is really a private key) is by having access to the private key

For a Developer, Blockchain is going to be an Internet of early days. Some 12 years ago, everybody had an idea about what Internet is but there were not many applications that work on internet. Developers will have opportunity to innovate and create amazing applications that will change the way businesses operate.

Blockchain Technology is about creating a secured information sharing network. It can be used whenever there are two or more parties are involved in a transaction. This transaction does not necessarily mean money, it can be raw information, documents, receipts, etc.

Till today, various business sectors have identified the use of Blockchain Technology. These sectors include and are not restricted to Healthcare, Banking and Finance, Supply Chain, Logistics, Automobile, Real estate, IoT Agriculture (with IBISA project).

The scope of Blockchain Applications is Tremendous. Cygnet Infotech recently came up with a webinar where they showcased Blockchain based prototypes for different industries which might interest you and give you an idea about the Blockchain possibilities.

There are two Bitcoins:

Bitcoin protocol: The technology that makes up the protocol.
Bitcoin blockchain: The most popular implementation of the technology.
The Bitcoin protocol uses cryptographic technology that has not yet been hacked. (If it were hacked, there are much bigger problems to worry about).

The Bitcoin blockchain relies on a network of operators to make sure the blockchain/ledger/database tracking BTC accounts and balances is current and reliable.

What makes the Bitcoin blockchain theoretically reliable is that no single operator can make unilateral changes to the database. To do so would require controlling a majority of the computing power used to validate changes to the database.

BCH fork was the most deanonymizing thing that has happened to Bitcoin. The sheer amount of data from that will taint all prefork coins for a very long time.

There is risk in everything…

Bitcoin isn't mainstream, and it may never be. And yet it would be unwise to ignore it. Some $14.9 billion worth of bitcoins were in circulation in January 2017, and blockchain, the technology underpinning bitcoin, has attracted plenty of attention for its disruptive potential in banking, trading, and even media.