Abstract: One or more implementations of the present specification provide an invoice access method and apparatus based on a blockchain, and an electronic device. The method includes: generating first ciphertext data by encrypting plaintext data of the target invoice based on a first key corresponding to an invoice issuer; generating second ciphertext data by encrypting the plaintext data of the target invoice based on a second key corresponding to an invoice receiver; adding the first ciphertext data and an user identifier of the invoice issuer to the blockchain as related to one another; and adding the second ciphertext data and an user identifier of the invoice receiver to the blockchain as related to one another.

Abstract: An air negative ion generating apparatus realized by bumping against a collision surface by a high-pressure gas flow carrying water molecules includes a liquid container and a cover body snapped onto a top opening end of the liquid container, and the cover body is provided with a high-pressure gas inlet pipe; a core assembly is provided inside the cover body, and the core assembly (4) includes a liquid flow chamber, a collision component and a liquid flow inlet; and a lower port of the high-pressure gas inlet pipe faces the collision component, the liquid flow inlet is located between the lower port of the high-pressure gas inlet pipe and the collision component, the liquid flow inlet is communicated with the liquid chamber, and a lower port of the liquid flow chamber is fixedly connected with a liquid conduit extending downwards.

Abstract: An air negative ion generating apparatus realized by bumping against a collision surface by a high-pressure gas flow carrying water molecules includes a liquid container and a cover body snapped onto a top opening end of the liquid container, and the cover body is provided with a high-pressure gas inlet pipe; a core assembly is provided inside the cover body, and the core assembly (4) includes a liquid flow chamber, a collision component and a liquid flow inlet; and a lower port of the high-pressure gas inlet pipe faces the collision component, the liquid flow inlet is located between the lower port of the high-pressure gas inlet pipe and the collision component, the liquid flow inlet is communicated with the liquid chamber, and a lower port of the liquid flow chamber is fixedly connected with a liquid conduit extending downwards.