What principle ensures that all nodes in a Blockchain network can access transaction records?

The principle that ensures all nodes in a Blockchain network can access transaction records is transparency. Transparency in blockchain technology means that transaction data is openly available to all participants in the network. Each node maintains a copy of the entire blockchain, which allows for any node to independently verify and audit the transaction records. This openness is crucial for building trust among participants and ensures that no single party can manipulate the data without consensus from other nodes in the network.

While consensus is important for validating transactions and ensuring agreement among nodes, it does not specifically address the accessibility of transaction records. Confidentiality refers to the protection of data from unauthorized access, which is not a focus in a public blockchain context where transparency is key. Decentralization pertains to the distribution of data and control across multiple nodes, which supports the integrity and security of the blockchain but is not what directly ensures accessibility to transaction records. Thus, transparency is the correct choice for emphasizing the accessibility of transaction records in a blockchain network.