Noun
chk (plural chks)
Abbreviation of check. (Can we add an example for this sense?)
A CHK is a SHA-256 hash of a document (after encryption, which itself depends on the hash of the plaintext) and thus a node can check that the document returned is correct by hashing it and checking the digest against the key. Source: Internet
The CHK is unique by nature and provides tamperproof content. Source: Internet