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Derivative liabilities (Tables)
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Summary of derivative liability balance
   Notes  Warrants  Total
Beginning Balance  $1,406,209   $155,022   $1,561,231 
Initial Derivative Liability   411,247    78,029    489,276 
Fair Value Change   153,540    (119,690)   33,850 
Derivative Settlement   (356,295)   —      (356,295)
Ending Balance  $1,614,701   $113,361   $1,728,062 
Fair value assumptions for derivative liabilities
    Commitment date   Remeasurement date
Expected dividends     -0-       -0-  
Expected volatility     197%-231%       233%  
Expected term     0.50 years       .5 years  
Risk free interest     2.49%-2.53%       2.44%  
Fair value assumptions for warrants
    Commitment date   Remeasurement date
Expected dividends     -0-       -0-  
Expected volatility     192%       178%-205%  
Expected term     5 years       2.59-4.86 years  
Risk free interest     2-23%       2.22%-2.25%