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Generating printable certificates to verify log authenticity

  • US 9,026,474 B2
  • Filed: 03/07/2011
  • Issued: 05/05/2015
  • Est. Priority Date: 03/07/2011
  • Status: Active Grant
First Claim
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1. A computer-implemented method comprising:

  • receiving, with one or more processors, an image;

    generating, with the one or more processors, a compound document of the image, the compound document including a document log and a page log;

    capturing, with the one or more processors, a change made to the image, the change comprising an annotation of the image;

    logging, with the one or more processors, the change made to the image;

    generating, with the one or more processors, a hash for the change made to the image, the hash including a previous hash of a previous transaction performed on the image and a unique identifier for a device that generated the hash for the change made to the image;

    updating, with the one or more processors, the document log and the page log of the compound document with the hash for the change made to the image;

    receiving, with the one or more processors, a request for a certificate, the certificate including the hash for the change made to the image;

    extracting, with the one or more processors, the hash for the change made to the image from the compound document; and

    generating, with the one or more processors, the certificate from the hash for the change made to the image.

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