Last tickets to Blockchain & Bitcoin Conference Turkey - price reduced!

Last tickets to Blockchain & Bitcoin Conference Turkey - price reduced! Blockchain & Bitcoin Conference Turkey: the price of the last 50 tickets is only 750 liras, for students - 350 liras instead of 450! http://ift.tt/2F0VIBR

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What exactly is a block?

What exactly is a block? I am trying to understand the Blockchain algorithm used in Bitcoin. I do not get the part how blocks are created. Let’s say transactions occur at some time. Then, if some nodes get these transactions, these verify the transactions are valid and then send it to other nodes. With this verify-send algorithm, almost every node verifies these newly occurred transactions in few seconds. Now, it is a time for a miner to do his job, which I do not understand. He needs to find a nonce which makes a lower value than hash values given in transactions. Question 1 How many transactions should a miner should verify in a single block? For example, if a miner A finds a nonce which gives a lower value than hash values given in 50 transactions, and if a miner B finds a nonce which gives a lower value than hash values given in 70 transacations, would a reward be given only to the miner B? So should a miner appropriately choose how many transacations he will work for? Ques...
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how a system based on a blockchain would deal with exponential growth of informations carried in it?

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Do extra hop channels in a BOLT#11 invoice need to exist on chain?

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