Abstract: A record including an original document and a modification to the original document is created. Metadata associated with the modification to the original document is generated. The modification in stored in a data store. Creation and registration of a decentralized identifier (DID) document for the modification is requested based on the generated metadata. Modified document metadata is generated which includes a document hash and the created DID document for the modification. Recordation of the modification in a blockchain transaction, creation and registration of a DID document for the modified document, and generation of verifiable credentials for the modification are requested. The generated verifiable credentials for the modification are stored and a quick response (QR) code for the DID document for the modification is generated. A visual representation of the modification and the QR code for the modification are added to the original document, generating a sealed document.

Abstract: An artwork managing method performed by a computer is provided. The computer receives a request for usage of first artwork, and generates a first decentralized identify (DID) document as a DID document including a first DID, which is a DID for identifying the first artwork, and including a second DID, which is a DID for identifying a first user requesting the usage of the first artwork. Also provided is a non-transitory program for causing the computer to perform the artwork management method. The method, computer, and program allow for robust management of information related to artwork using self-sovereign identify (SSI).

Abstract: A record including an original document and a modification to the original document is created. Metadata associated with the modification to the original document is generated. The modification in stored in a data store. Creation and registration of a decentralized identifier (DID) document for the modification is requested based on the generated metadata. Modified document metadata is generated which includes a document hash and the created DID document for the modification. Recordation of the modification in a blockchain transaction, creation and registration of a DID document for the modified document, and generation of verifiable credentials for the modification are requested. The generated verifiable credentials for the modification are stored and a quick response (QR) code for the DID document for the modification is generated. A visual representation of the modification and the QR code for the modification are added to the original document, generating a sealed document.

Abstract: A system and a method are provided to facilitate a search of information indicated by stroke data. A system includes a processor. The processor obtains stroke data generated in response to handwriting input and generates, by performing semantic analysis on the stroke data, semantic metadata including semantic data indicating semantics of the stroke data and purpose data determined based on the semantic data.

Abstract: An information processing system includes an information processing device, a food material stock managing device disposed in a food material storage device, and a meal condition detecting device. The information processing device includes a display device including a display screen, a first communicating circuit that communicates with a portable terminal of a target person, a second communicating circuit that communicates with the food material stock managing device, a third communicating circuit that communicates with the meal condition detecting device, a processor, and a memory storing instructions that cause the information processing device to generate information regarding proposed food to be provided to the target person based on information obtained from the first, second, and third communicating circuits, and display the information regarding the proposed food to be provided to the target person on the display screen of the display device.