Casascius bitcoin address checker

Bitcoin Address Utility is an open-source program that allows a user to do various useful functions with Bitcoin addresses, such as convert them between various formats, encrypt and decrypt them, and print them as paper wallets. This program was started by Casascius and is available on GitHub at https: It is written in C and is based on Microsoft's.

The Base58Check calculator screen allows quick conversions between the Base58Check encoding commonly used in Bitcoin-related objects and casascius bitcoin address checker encoded hexadecimal equivalent. This screen is especially useful for discovering what hexadecimal prefix is required to create Base58Check strings with a specific prefix, or for seeing what is encoded in non-standard Base58 strings generated by service providers.

The bit checksum is verified on all Base58 entries, and "invalid" is displayed in the hex box if the checksum is incorrect. However, verification of the checksum can be skipped simply by appending a question mark? Once the hexadecimal equivalent is known, simply making an insignificant casascius bitcoin address checker to the hex box such as adding a space to the end will result in the correct checksum being recomputed and displayed. If "invalid" is still shown after adding a question mark to the Base58 string, it probably contains invalid characters such as 0, O, I, or l.

The Key Combiner screen allows elliptic-curve arithmetic on Bitcoin public and private keys. Specifically, multiplication can casascius bitcoin address checker used for creating two-factor Bitcoin addresses, and addition can be used for secure vanity address generation. The two boxes accept either a public or private key in casascius bitcoin address checker recognized format hexadecimal, WIF, minikey, etc.

Multiplying or adding two private keys yields a new private key, as well as its corresponding public key and Bitcoin address. Multiplying or adding a private key and public key yields a combined public key and Bitcoin address, but no private key. When the public key input is replaced casascius bitcoin address checker the matching private key, then calculating the resulting private key becomes possible.

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