Generating a request for reprocessing of a replaceable supply component

A non-transitory computer-readable storage medium comprising instructions that when executed cause a computing device to:

• establish a key with a chip of a replaceable supply component using a key derivation function (KDF) derived key;
• generate a request blob including a request to reprocess the replaceable supply component using a printing device including the computing device, the request blob having a plurality of attributes, each attribute being of a particular data type, the request blob including a header having an identity envelope for registration of the printing device with the exchange service;
• cryptographically sign the request blob;
• send the request blob to an exchange service using an exchange service component of the printing device;
• receive a response from the exchange service at the exchange service component of the printing device with data to be written to a non-volatile memory of the replaceable supply component, and;
• write the data to a non-volatile memory of the replaceable supply component with the printing device.

A non-transitory computer-readable storage medium comprising instructions that when executed cause a computing device to:

• generate a request blob including a request to reprocess a replaceable supply component using a printing device including the computing device, the request blob having a plurality of attributes, each attribute being of a particular data type, the request blob including a header having an identity envelope for registration of the printing device with the exchange service;
• cryptographically sign the request blob;
• send the request blob to an exchange service using an exchange service component of the printing device;
• receive a response blob from the exchange service, the response blob having a plurality of attributes, each attribute being of a particular data type;
• and
• in response to receiving the response blob, append data in a memory chip of the replaceable supply component using the printing device.