To emphasize again at this point: Bitcoins only exist as transfers in the blockchain, and sufficient "account coverage" for a new transfer must be proven by referencing one or more previous transfers. Bitcoins cannot therefore be put in a safe at home or under your pillow; they exist purely virtually in the blockchain.
The account balance of a user is calculated from the sum of all incoming transfers minus the sum of all outgoing transfers. Wallet software for managing Bitcoin accounts does not store any Bitcoins, but only the public and private keys of an account. The person belgium telegram screening who has access to the private key also has access to the corresponding account, or vice versa, if a private key is lost, access to the account is also completely lost. There is no "reset password" function and no call center that could restore access to an account. As long as public key procedures remain cryptographically secure, the keys of Bitcoin accounts cannot be overcome either.
Since hash values, or hashes for short, form a central part of the Bitcoin infrastructure, we would like to briefly recall their characteristics: They are calculated by so-called hash functions and form a kind of digital fingerprint for data. Any size input data is converted into a bit chain that is, according to all practical considerations, unique, e.g. 256 bits long, which is usually represented in hexadecimal notation. For example, the hash of the SHA256 function for "Bitcoin" is as follows.