If cryptocurrency is decentralized how do the currency be accurate and secured No one knows where the ledger are stored and how they are audited Moreover blockchaincom is a website managed by a group

Cryptocurrencies like Bitcoin and Ethereum are decentralized because they operate on a distributed ledger technology called blockchain. This means that the ledger is not stored in one central location, but rather it is spread across a network of computers. Each node on the network has a copy of the ledger, and transactions are verified and recorded in a transparent and secure manner.

The accuracy and security of the ledger are ensured through a consensus mechanism, such as proof of work or proof of stake. This means that nodes on the network must agree on the validity of transactions before they are recorded on the ledger. This process is automated and does not require any centralized authority or intermediaries.

As for auditing, the transparency of the blockchain means that anyone can view the ledger and track transactions. There are also third-party auditors who can review and verify the accuracy of the ledger.

While blockchain.com may be managed by a group of IT professionals, it does not have control over the blockchain network itself. The management of a website or application does not necessarily impact the decentralization of the underlying technology.