Bitcoin is a type of digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank, it has a method of to securing transactions. The blockchain is a shared public ledger on which the entire Bitcoin network relies. It allows Bitcoin wallet to calculate their spendable balance so that new transactions can be verified thereby ensuring they’re actually owned by the spender. The integrity and the chronological order of the block chain are enforced with cryptography. Transaction is a transfer of value between wallets that gets included in the block chain.wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet. Here are a few method to buy/sell bitcoin paypal,perfectmoney,other cryptocurrencies e.t.c. 4264https://www.x-crypto.com