Receiving apparatus, comprising: - a first communication interface, wherein - the first communication interface is configured to receive first messages from a distributed database system; - an identification module, wherein - the identification module is configured to use the respective message content of the first messages to calculate an association concerning which devices an applicable first message is intended for; - a conversion module, wherein - the conversion module is configured to convert the message content of the applicable first message into a data format for the associated device, - a cryptography module, wherein the cryptography module comprises cryptographic data associated with the devices, the cryptographic data are ascertained on the basis of a combination of explicit device-specific data and receiving-apparatus-specific data, and the cryptographic data are reproducibly ascertained for the applicable device; - the cryptography module uses the cryptographic data to check and/or decrypt at least some of the message content of the applicable first message for an associated device, - the checking and/or the decrypting involve/s the applicable cryptographic data being loaded on the basis of the associated device; - a second communication interface, wherein - the second communication interface is configured to transmit the converted message content to the device associated with the applicable first message. - a first communication interface, wherein - the first communication interface is configured to receive first messages from a distributed database system; - the first communication interface is configured to receive first messages from a distributed database system; - an identification module, wherein - the identification module is configured to use the respective message content of the first messages to calculate an association concerning which devices an applicable first message is intended for; - the identification module is configured to use the respective message content of the first messages to calculate an association concerning which devices an applicable first message is intended for; - a conversion module, wherein - the conversion module is configured to convert the message content of the applicable first message into a data format for the associated device, - a cryptography module, wherein the cryptography module comprises cryptographic data associated with the devices, the cryptographic data are ascertained on the basis of a combination of explicit device-specific data and receiving-apparatus-specific data, and the cryptographic data are reproducibly ascertained for the applicable device; - the cryptography module uses the cryptographic data to check and/or decrypt at least some of the message content of the applicable first message for an associated device, - the conversion module is configured to convert the message content of the applicable first message into a data format for the associated device, - a cryptography module, wherein the cryptography module comprises cryptographic data associated with the devices, the cryptographic data are ascertained on the basis of a combination of explicit device-specific data and receiving-apparatus-specific data, and the cryptographic data are reproducibly ascertained for the applicable device; - the cryptography module uses the cryptographic data to check and/or decrypt at least some of the message content of the applicable first message for an associated device, - the checking and/or the decrypting involve/s the applicable cryptographic data being loaded on the basis of the associated device; - a second communication interface, wherein - the second communication interface is configured to transmit the converted message content to the device associated with the applicable first message. - the second communication interface is configured to transmit the converted message content to the device associated with the applicable first message.