Blockchain-based greeting: building a more secure and transparent social network

The blockchain establishes an encrypted connection through a handshake protocol, verifies the identities of participants, and allows distributed nodes to agree on the validity of transactions through a consensus mechanism. Consensus mechanisms include types such as PoW, PoS, DPoS, and BFT, which are selected based on the throughput, security, energy efficiency, and degree of decentralization of the blockchain. This combination ensures the reliability of transaction verification and maintains the integrity of the blockchain.

Blockchain greeting: handshake protocol and consensus mechanism

Blockchain is a distributed ledger Technology, its infrastructure requires a way to agree on transactions between participants. To achieve this, blockchain utilizes handshake protocols and consensus mechanisms.

Handshake Protocol

Handshake Protocol is the process by which participants establish trust and verify their identity before commencing communication. In blockchain, a handshake protocol is used to establish an encrypted connection and exchange identity information between participating nodes. Typically, handshake protocols use asymmetric encryption, with participants holding private and public keys. The private key is used to decrypt the message, while the public key is used to encrypt the message. By exchanging public keys, nodes can verify each other's identities and establish secure connections.

Consensus Mechanism

Consensus mechanism is a process in a blockchain network through which all participants agree on the validity of a transaction. When a new transaction is broadcast to the network, the consensus mechanism verifies the transaction to ensure it is valid and does not compromise the integrity of the blockchain.

There are many different consensus mechanisms, including:

• Proof of Work (PoW) : requires miners to solve complex mathematical problems to verify transactions.
• Proof of Stake (PoS) : Transactions are verified based on the holder’s stake (i.e. the amount of the cryptocurrency asset).
• Delegated Proof of Stake (DPoS) : A group of elected representatives validate transactions.
• Byzantine Fault Tolerance (BFT) : Ensuring that the network continues to operate normally even if some nodes fail.

The consensus mechanism chosen depends on the specific needs of the blockchain, such as throughput, security, energy efficiency, and degree of decentralization.

By combining handshake protocols and consensus mechanisms, blockchain can safely and efficiently verify transactions and ensure the integrity of the network.

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