Abstract: A video preview method includes receiving, by an electronic device, a first operation, displaying, by the electronic device, a first screen on a touchscreen of the electronic device in response to the first operation, where the first screen is a page of a home screen or a leftmost screen, obtaining, by the electronic device, a first preview video corresponding to a first video application when the first screen includes an identifier of the first video application, displaying, by the electronic device, a first video preview window in the first screen, and playing, by the electronic device, the first preview video in the first video preview window.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: A method for blockchain-based data verification is provided. The method includes: obtaining target data submitted by a data submitter, wherein a first data digest of the target data is recorded in a blockchain; computing a second data digest of the target data; determining whether the second data digest matches the first data digest of the target data recorded in the blockchain; and determining that the target data submitted by the data submitter is valid in response to determining that the second data digest matches the first data digest of the target data recorded in the blockchain.

Abstract: A method for blockchain-based data verification is provided. The method includes: obtaining target data submitted by a data submitter, wherein a first data digest of the target data is recorded in a blockchain; computing a second data digest of the target data; determining whether the second data digest matches the first data digest of the target data recorded in the blockchain; and determining that the target data submitted by the data submitter is valid in response to determining that the second data digest matches the first data digest of the target data recorded in the blockchain.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: A service recommendation method includes: receiving event information that is sent by a service distribution platform and that is subscribed to by a user, where the event information includes an event arrival time; generating and displaying one or more first service items at a first moment, where the one or more first service items are related to at least a time interval t1 between the event arrival time and the first moment; and generating and displaying one or more second service items at a second moment, where the one or more second service items are related to at least a time interval t2 between the event arrival time and the second moment, where the first moment is before the second moment, and the one or more first service items are not completely the same as the one or more second service items.

Abstract: Embodiments of this application relate to the field of electronic devices, and disclose a video preview method, to resolve a problem that using efficiency of an electronic device is low. A specific solution is as follows: The electronic device receives a first operation, and displays a first screen on a touchscreen of the electronic device in response to the first operation, where the first screen may be a page of a home screen or a leftmost screen. When the first screen includes an identifier of a first video application, the electronic device obtains a first preview video corresponding to the first video application, displays a first video preview window in the first screen, and plays the obtained first preview video in the first video preview window.

Abstract: Disclosed are a transaction card and an information displaying method. The transaction card includes a card body, a power supply, a graphic code generation circuit, and a display device. The power supply, the graphic code generation circuit, and the display device are embedded within the card body. The power supply is connected to the graphic code generation circuit and the display device. The graphic code generation circuit is configured to generate a graphic transaction code based on transaction account information of a user. The display device is configured to display the graphic transaction code.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: Disclosed are a transaction card and an information displaying method. The transaction card includes a card body, a power supply, a graphic code generation circuit, and a display device. The power supply, the graphic code generation circuit, and the display device are embedded within the card body. The power supply is connected to the graphic code generation circuit and the display device. The graphic code generation circuit is configured to generate a graphic transaction code based on transaction account information of a user. The display device is configured to display the graphic transaction code.

Abstract: A method for blockchain-based data verification is provided. The method includes: obtaining target data submitted by a data submitter, wherein a first data digest of the target data is recorded in a blockchain; computing a second data digest of the target data; determining whether the second data digest matches the first data digest of the target data recorded in the blockchain; and determining that the target data submitted by the data submitter is valid in response to determining that the second data digest matches the first data digest of the target data recorded in the blockchain.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.

Abstract: Provided is a method for blockchain-based recordkeeping and implementable by a terminal device. The method comprises: obtaining target data; computing a data digest of the target data, and extracting a key segment from the target data; signing, in a secure operation environment included in the terminal device, the data digest and/or the key segment based on a private key associated with the terminal device to generate a signature; and submitting to a blockchain the data digest, the key segment, and the signature, for one or more nodes in the blockchain to verify the signature based on a public key corresponding to the private key, and to record the data digest and the key segment in the blockchain in response to the signature being verified to be valid.