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Blockchain Database. Store all you passwords or classified info on the blockchain. All info is signed and encrypted - no one except the user with the password private key have access. In one key (or database) you can have multiple entries with private information. Many keys or wallets or databases can be open.

The Blockchain Database can be considered as a breakthrough of the century. The breakthrough of the century is not the blockchain bitcoin. Why? Because Bitcoin only wants to address and capitalize on the currency. But the Blockchain Database addresses the base of computing software.