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<center style="font-size:30px"> <b>DISTRIBUTED IMMUTABLE DATA OBJECT</b> </center> <center style="font-size:30px"> (DIDO) </center> <center style="font-size:30px"> Reference Architecture (RA) </center> <center style="font-size:15px"> for </center> <center style="font-size:20px"> Cryptocurrencies, Blockchains, Distributed Ledgers and Tangles </center> <center> <i>Version 2.0</i> </center> <center> <i>June 2020</i> </center> <center style="font-size:12px"> R. W. “Nick” Stavros<br/> Ian T. Stavros<br/> Bryan Turek <br/> Char Wales </center> <center style="font-size:10px"> <b><i>Jackrabbit Consulting</i></b> </center> <center style="font-size:12px"> Marc Abrams<br/> John Black </center> <center style="font-size:10px"> <b><i>Harmonia Holdings Group, LLC</i></b> </center>

<center>This material is based upon work supported by the</center> <center>U.S. Army Small Business Innovation Research Program Office, </center> <center>Defense Advanced Research Projects Agency (DARPA) and the </center> <center>Army Research Office under Contract Number: W911NF-17-P-0029 W911NF-17-P-0029. </center> <center> The views and conclusions contained in this document or website</center> <center> are those of the authors and</center> <center>should NOT be interpreted as representing the </center> <center>Official Policies, either expressly or implied, </center> <center>of the</center> <center>THE DEFENSE ADVANCED RESEARCH PROJECTS AGENCY (DARPA) </center> <center>OR THE U.S. GOVERNMENT