| CPC G06Q 10/0875 (2013.01) [G06Q 20/3829 (2013.01); G06Q 20/389 (2013.01); G06Q 40/00 (2013.01); G06Q 2220/00 (2013.01)] | 14 Claims | 

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               1. A method performed by one or more computing systems of a network of network nodes for preserving privacy of obligations during a network scan, the method comprising: 
            under control of an initiator network node, 
                generating a scan identifier based on an initiator identifier of the initiator network node and a timestamp; 
                  signing an initiate scan request using a first private key of a first public/private key pair; 
                  selecting a nominated network node from the network of network nodes; and 
                  sending to the nominated network node the initiate scan request that includes the scan identifier; and 
                under control of the nominated network node, 
              receiving the initiate scan request; 
                  signing the initiate scan request using a second private key of a second private/public key pair; and 
                  initiating a scan request by sending to a receiving network node the initiate scan request that is signed using the first private key and the second private key. 
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