Coinbase is not available for purchase of bitcoin in all countries. Be aware that there are high fees to withdraw from coinbase.

It was not a gradual drop but a $1500 fall. Bitcoin is now recovering and is at $6500 ob bitfinex at the moment.

Bitcoin back over $6000. It will recover but may be a long timescale.

Firstly I would not enter secure site from email links. Why does etherdelta require MEW private key? This means your account is open to etherdelta site. Surely private means private.

I stopped using coinbase due to their high fees. Also tend to change bitcoin to litecoin when transferring as it is cheaper.

Diamonds are not as rare as some believe. There is a cartel that controls the supply and therefore the price of diamonds. This is not the case with bitcoin.

Most currencies down today. Good be an opportunity to buy if you can hit at the bottom.

Most altcoins are also down. Anyone who bought a year ago is still well in profit. Bitcoin has recovered from drops in the past.

Cost of exchanging coins via exchanges can eat into profits and price can change before transfer is complete but if you are interested here is a link.

 https://twitter.com/Arbitrage_alert

The problems with arbitrage are the exchange costs and time taken to transfer from one exchange to another. Price can change in this period.
Try this info,
 https://twitter.com/Arbitrage_alert
No referral link in the above.

If you sell at $7000 you will take heavy loss. At the moment you have a paper loss not a realised loss. You have to decide if bitcoin will increase in future so you can make profit. Bitcoin is at $7200 on bitfinex at the moment.

Many airdrop tokens,ECR-20, do not have much value. In some cases the quantity received is too small to have more value than cost of selling. All you can do is keep them and hope for increase in value.

No one should give their private key to any site,not just airdrops. If site is asking to send coins to receive airdrop then it is not an airdrop.

You can lend on yobit or bitfinex. I find bitfinex better as yobit require you to use a gambling game to lend bitcoin. Lending is safe on bitfinex.

Now that segwix2 has been cancelled bitcoin can trade without any fork manipulating the price. Bitcoin still has increase in price to come although there may be a temporary decrease.

I found converting to litecoin then transfering was cheaper than other coins but fee will change depending on exchange used.

If Satoshi ever reveals himself do you think it will make any affect on the price of bitcoin?

The main exchange for ECR-20 tokens is etherdelta. Many tokens are given by airdrops. The value received can be less than cost of exchange so perhaps volume is down because there is no profit in exchanging.

These tokens are not a type of ethereum. They can be held on exchanges,main one is etherdelta, or in ether wallets that support these tokens. You need to pay via ether to sell or transfer these tokens so make sure your holding is worth more than the transfer cost.

If you have to send coins then it is not a true airdrop.