1. Bitcoin Authenticates the User with a Digital Signature
When you go to a bank to perform a transaction, it needs you to authenticate yourself. You may do this with your driver’s license, social security card, or handwritten signature. In any case, these mechanisms are in place so that only you can withdraw or transfer money that you own. If someone tries to impersonate you, he would be caught (hopefully).
As has been explained above, Bitcoin utilizes a public ledger, on which everyone records their transactions. But what’s to keep people from adding fraudulent transactions that benefit them? For instance, Bob could simply add to the ledger that Alice sent him money.
To prevent this, transactions are broadcast to the network along with a digital signature.
A digital signature ensures two things:
The designated sender has sent the message.
The message has not been tampered with.
This digital signature is created using a hashing algorithm and asymmetric encryption.
Earn bitcoin daily up to 500% return with https://maxreturns.vip/wallet/signup/zet9ZjKg
Hashing uses an algorithm that irreversibly converts an input into a unique output of a fixed length. Bitcoin’s hashing algorithm is SHA256, which means the output – also known as a hash or digest – has 256 binary digits (i.e., zeros and ones).
You can think of hashing as a mathematical technique by which you can convert an input value into an output value very quickly. However, when given an output value, it’s practically impossible to figure out the input value used to get the corresponding result.
One way to conceptualize this is by making a cake. The input is flour, sugar, eggs, etc., and the output is the finished cake. The algorithm is the oven that turns the raw ingredients into the finished product. Once you have the cake, it’s impossible to turn it back into the raw ingredients. It’s also impossible to determine exactly what the raw ingredients were and how much of each was used.
To create a digital signature, the message broadcast to the network first needs to be hashed. Then, the hash needs to be encrypted.
As mentioned above, the type of encryption employed by Bitcoin is known as asymmetric encryption – a form of encryption that utilizes what are known as public and private keys.
Asymmetric encryption works because each person has a public and private key that correspond with one another. While you can use the public and private keys separately to encrypt a message, to decrypt it, you need both. In other words, if you encrypt with a public key, it must be decrypted with a private key and vice versa.
Earn bitcoin daily up to 500% return with https://maxreturns.vip/wallet/signup/zet9ZjKg
The private key belongs to one person, and no one else has access to it. In contrast, you can give anyone your public key. So say Alice wants to send Bob a private message. Alice encrypts the message using Bob’s public key that he gave her. Because Bob is the only one with his private key, so he’s the only one who can decrypt it. If Bob wants to send Alice a private message, he encrypts it using her public key, and only she can decrypt it using her private key.
With Bitcoin, the aim isn’t to send a private message – remember, the ledger is public. Nevertheless, asymmetric encryption still ensures that the message was actually sent by the person you think it is and that it hasn’t been tampered with.
So let’s say Alice wants to send Bob one Bitcoin. To do so, she broadcasts two things to the network:
A message (containing the details of the transaction). The transaction is unencrypted and contains the link to previous transactions. It also contains input and output values, which help determine whether there are enough funds for the transaction to be considered valid.
A digital signature (i.e., the hashed message that she’s encrypted with her private key)
Bob then authenticates the transaction by:
Applying the hash algorithm to the message, giving him Hash A.
Decrypting the digital signature Alice created using Alice’s public key. This gives him Hash B.
Since both hashes were derived from the same message, they should be the same. If they are, it proves that nobody tampered with the message. And since Bob was able to decrypt the hashed message using Alice’s public key, and Alice is the only one with access to her private key, it also ensures that the message came from her.
Earn bitcoin daily up to 500% return with https://maxreturns.vip/wallet/signup/zet9ZjKg
About Smart Trade Coin Nowadays, despite impressive profits, trading in cryptographic currencies on financial markets is becoming more and more challenging. The only way to be successful in this area is to have a powerful information tool that will enable you to trade several orders of magnitude more effectively. Our team has created and is ready to launch the revolutionary SMART TRADE COIN SOFTWARE. The profitability of arbitrage transactions made using it has been confirmed by independent live-testing. We will direct the entire potential of SMART TRADE COIN WORLD to building the largest decentralized crypto training community capable of directly influencing major exchanges. Smart Trade Coin allows people to successfully trade in cryptocurrencies even in small amounts. Smart Trade Coin is planning a new revolutionary functionality. It will allow for even better use of the STC platform for financial transactions. It will also allow for obtaining considerable profits! VISA Smart Trade Coin. This is an excellent option that will allow you to gain even more! ........ https://go.smarttradecoin.com/?hash=a63407f7b12a48f4c3f92b58 ........ https://oceans-online.com/members/register/&hash=NE1aUGZuU3BmRXBlU0w4dFRGcEc1RlRIbUs3bDZyRGU1Z2dLeDNBNVpLST0= ........ #localbitcoins #tradebtc #paxful #rollsroyce #bitcoinusap #stocks #cryptolife #btcusd #luxury #ripple #billionaire #investimento #trade https://www.instagram.com/p/CCpbpwvHVw-/?igshid=qrh3btm1zdb6
(Tin tức) Những ai đầu tư SportArb hẳn nhận được Newsletter ngày hôm qua với thông báo rằng SportArb vừa giành được Tradebtc.biz sau nhiều tuần thương thảo. Admin của SportArb bắt đầu lấn sang mảng Trading CryptoCurrency với sự hỗ trợ từ đội ngũ của Tradebtc chuyển sang.
Vì SportArb và TradeBTClà 2 site độc lập và kinh doanh chia lãi khác nhau nên hiện tại dù về một chủ nhưng vẫn duy trì phương…
(Tin tức) TradeBTC chính thức chấp thuận clix5 làm đại diện (Representative), chính vì vậy mức RCB hiện tại là 8% sẽ được clix5 tăng thêm 4% nữa thành 12%. mức RCB này bắt đầu tính cho nhà đầu tư tuyến dưới từ ngày 04.03.2017.
Đây cũng là site có mức RCB cao nhất trong các site đầu tư hiện tại. Lưu ý việc nâng mức RCB này nhằm giúp anh em đầu tư có thêm thu nhập ban đầu chứ không phải cổ vũ nhà…
Review TradeBtc-Lãi ngày 2.5% trong 60-120 ngày lịch, RCB 8%
Review TradeBtc-Lãi ngày 2.5% trong 60-120 ngày lịch, RCB 8%
(HYIP-Middle Risk) TradeBtc.biz được đưa vào HYIP zone tuần qua và là một site rất mới online ngày 17.02.17 và hứa hẹn là một site longterm lâu dài.
Tradebtc.biz có thiết bình thường không quá nổi bật hay chuyên nghiệp, những thông tin về site rất ít và thậm chí mang lại sự thất vọng cho nhà đầu tư khi tìm hiểu về site. Có lẽ chỉ Plan đầu tư là khá rõ ràng và đơn giản: 2.5% lãi hàng ngày trong…
