Abstract: A method for crypto-currency transaction authentication includes receiving, by a computing device, from a data storage device associated with a first entity, an authentication information demonstrating possession of a private key, retrieving, by the computing device, from an audit chain, at least one crypto-currency transaction to an address associated with a public key corresponding to the private key, and authenticating, by the computing device, based on the retrieved crypto-currency transaction, the first entity.

Abstract: A method for block-chain verification of goods includes obtaining, by a first computing device, a first address. The method includes exporting, by the first computing device, the first address to a first code affixed to a first product. The method includes filing, by the first computing device, a first crypto-currency transaction to the first address, at a transaction register. The method includes receiving, by a second computing device, from a code scanner, the first address, scanned from the first code affixed to the first product. The method includes verifying, by the second computing device, the first crypto-currency transaction at the transaction register, using the first address. The method includes identifying, by the second computing device, based on the verification, that the first product is authentic.

Abstract: A method for block-chain verification of goods includes scanning, by a computing device, using a code scanner, an address from a code affixed to a product, verifying, by the computing device, that the address is associated with a crypto-currency transaction recorded at a transaction register, obtaining, by the computing device, at least one current transaction datum, and determining, based on the verification and the at least one current transaction datum, that the product is authentic.