Final answer:
The incorrect characteristic of Blockchain is that it is a centralized digital ledger; Blockchain is actually decentralized, with data stored in blocks accessible from many different parts.
Step-by-step explanation:
The characteristic of Blockchain which does NOT refer to it is that it is a centralized digital ledger. In contrast, one of the defining features of Blockchain technology is its decentralization. This means that instead of being controlled by a single entity, a blockchain is distributed across a network of computers, all of which can access the blockchain and have a copy of the ledger. Data within a blockchain is indeed stored in blocks, and once data is added to a block and the block is added to the chain, it becomes immutable, meaning it cannot be changed. This feature enhances the security and trustworthiness of the data recorded on the blockchain.