IOTA vs promise

IOTA

noun
  • A bank account that earns interest and pays it to a third party, generally a charity; the principal is typically being held in escrow by the accountholder. 

promise

noun
  • A transaction between two persons whereby the first person undertakes in the future to render some service or gift to the second person or devotes something valuable now and here to his use. 

  • A placeholder object representing the eventual result of an asynchronous operation. 

  • Reason to expect improvement or success; potential. 

  • an oath or affirmation; a vow 

verb
  • To commit to (some action or outcome), or to assure (a person) of such commitment; to make an oath or vow. 

  • To give grounds for expectation, especially of something good. 

How often have the words IOTA and promise occurred in a corpus of books? (source: Google Ngram Viewer )