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imageBitcoin was created to meet this need. Transactions that are computationally impractical to reverse would protect sellers from fraud, and routine escrow mechanisms could easily be implemented to protect buyers." Nakamoto explained, "What is needed is an electronic payment system based on cryptographic proof instead of trust, allowing any two willing parties to transact directly with each other without the need for a trusted third party.

The first computer to solve the problem adds the transaction to the ledger and receives a small payment. To make transactions too "computationally impractical to reverse," Bitcoin uses Proof-of-Work (PoW). The problems require substantial processing power and a network of computers race to solve the problem. For a transaction to be posted to the ledger, a problem that is difficult to solve but easy to verify must be computed.

Fail-stop fault : This type of fault occurs when a node merely has crashed. This type is difficult to handle since it can create confusion due to misleading information. Paxos protocol, introduced earlier in this chapter, is normally used to deal with this type of fault. State machine replication protocols such as PBFT was developed to address this second type of faults. These faults are simple to deal with Byzantine faults : The second type of fault is one where the faulty node exhibits malicious or inconsistent behavior arbitrarily. Fail-stop faults are the easier ones to deal with of the two fault types. This can be a result of an attack by adversaries, a software bug, or data corruption.

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It uses blockchain technology to create secure digital currency transactions. Bitcoin is the first decentralized cryptocurrency created. This allows users to confirm the availability of funds before making a transaction. Instead of trusting a bank that an account has funds available to transfer, Bitcoin makes account information and transaction history public. There is no central authority that controls Bitcoin.

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There is no mainstream application of these types of blockchains, as they deviate from the core concept of decentralization in blockchain technology. Nonetheless, in specific private settings within an organization, there could be a need to share data and btc provide some level of guarantee of the authenticity of the data.

In the paper, Nakamoto argues that the problem with current banking systems is that they rely on trust. Because the financial institutions act as a trusted intermediaries, they also have to mediate any disputes that arise over a transaction. So, financial institutions can reverse a transaction. Financial institutions act as a trusted third-party intermediaries to process payments. The flaw of this system is that financial institutions can not make non-reversible transactions.

The owner is also not required to link real-world information to their account. Anyone can create a bitcoin account or bitcoin address. Transactions are tied to this bitcoin address. This makes purchases with bitcoin private. There is no approval process. The owner of the bitcoin address is not recorded in the transaction record.

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Now let's see how a blockchain actually works. A critical decision that every blockchain network has to make is to figure out that which node will append the next block to the blockchain. The consensus mechanism will be described later in this chapter. We have now defined and described blockchain. This decision is made using a consensus mechanism . Nodes are either miners who create new blocks and mint cryptocurrency (coins) or block signers who validates and digitally sign the transactions.

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