Update 'README.md'

README.md

@@ -37,7 +37,7 @@ The timestamp is a unixtimestamp represented as a 64 bits signed integer.
 
 ### PROOF
 
-The PROOF token proves the origin and signs the message. It is composed of the hash of the client concatenated with a SHA256 of the message without the TIMESTAMP, PROOF and with a metric value of 0.
+The PROOF token proves the origin and signs the message. It is composed of the hash of the client concatenated with a SHA256 of the message without the PROOF and with a metric value of 0.
 
 ### Key=value pairs