start with a capital L or K on mainnet (c on testnet). What would happen if the random number generator were not quite random? This rescue procedure provides the second main route through which private keys become visible to end users. Alice then sends this public key to Bob (bottom) while keeping her private key secret (center-left). For more information, see A Gentle Introduction to Bitcoin Cold Storage.
These keys are not stored on the Bitcoin network but are created and stored by the file/software.
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Two of the most popular are storage media and communications channels. Wallet software often tries to shield users from the need to directly handle and understand private keys. Instead of relaying emails, texts, or web pages, the Bitcoin network processes value-transfer messages called transactions. Attackers can exploit this uncertainty and the inexperience of new users to steal funds. For example, what if all output private keys were clustered about a constant value within a narrow range? This is considered very dangerous, and not intended to be used even by power users or experts except in very specific cases.
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