checksum
noun
check·sum ˈchek-ˌsəm 
: a sum derived from the bits of a segment of computer data that is calculated before and after transmission or storage to assure that the data is free from errors or tampering
Example Sentences
Recent Examples on the Web There’s no checksum, no sender verification, no nothing. 
Neil J. Rubenking, PCMAG, 11 Aug. 2022 This puzzle was brilliantly answered by Ben, using a sophisticated version of the checksum modulo-3 technique from Puzzle 3. Quanta Magazine, 23 Mar. 2016 By tracking the MD5 checksum, which uniquely identifies the original source of a song, Hoffman said that Emusic would be able to track files that were being made available from one individual to other Napster users. Brad King, WIRED, 21 Nov. 2000
Neil J. Rubenking, PCMAG, 11 Aug. 2022 This puzzle was brilliantly answered by Ben, using a sophisticated version of the checksum modulo-3 technique from Puzzle 3. Quanta Magazine, 23 Mar. 2016 By tracking the MD5 checksum, which uniquely identifies the original source of a song, Hoffman said that Emusic would be able to track files that were being made available from one individual to other Napster users. Brad King, WIRED, 21 Nov. 2000 Word History
First Known Use
1940, in the meaning defined above