anchor.diff:  
   | REPLAYED_REQUEST 
   | Server has seen the OTP/Nonce combination before
  -
  -
  -## Changes since version 1.1
  +|===
  +
  +== Changes since version 1.1
   
   The verify URL has changed.  In the request, the new required field
   "nonce" were added, and the new optional fields "sl" and "timeout" are
  
positive.code: 
  An example request:
  
  ```
  http://api.yubico.com/wsapi/2.0/verify?otp=vvvvvvcucrlcietctckflvnncdgckubflugerlnr&id=87&timeout=8&sl=50&nonce=askjdnkajsndjkasndkjsnad
  ```
  
  And if you require additional information on timestamp and session
  counters:
  
  ```
  http://api.yubico.com/wsapi/2.0/verify?id=87&otp=vvvvvvcucrlcietctckflvnncdgckubflugerlnr&timeout=8&sl=50&nonce=askjdnkajsndjkasndkjsnad&timestamp=1
  ```
  
  ## Response
  
  The verification response tells you whether the OTP is valid.  The
  response has the following values:
  
negative.code: signature or use HTTPS connections (and verify the server
  certificate).
  
  == Generating signatures
  
  The protocol uses HMAC-SHA-1 signatures. The HMAC key to use is the
  client API key.
  