Which of the following technologies is utilized for securing blockchain transactions?

Encryption algorithms are fundamental to the security of blockchain transactions. They play a critical role in ensuring the confidentiality, integrity, and authenticity of the data being processed. Each transaction in a blockchain is secured using cryptographic algorithms, which help protect sensitive information and prevent unauthorized access.

Specifically, public key cryptography is utilized in blockchain systems to create a secure environment where users can generate and manage their own cryptographic keys. This method allows users to sign transactions securely, which ensures that only the rightful owner can authorize transactions associated with their digital assets. Furthermore, algorithms such as SHA-256 are often employed in the hashing process, ensuring that each transaction is uniquely represented and cannot be altered without detection.

In contrast, other technologies mentioned—such as cloud computing, which focuses on providing storage and computing resources over the internet, or data compression methods, which minimize the amount of data needed to represent information—do not inherently provide security features specific to blockchain transactions. Artificial intelligence can contribute to various aspects of blockchain applications, such as enhancing decision-making processes or optimizing transactions, but it does not directly secure the transactions themselves.

Thus, encryption algorithms are essential for maintaining the security and trustworthiness of blockchain systems, validating the selection as the correct answer.