Legal Tender Cases (79 U.S. 457…
“ Creditors may exact gold and silver or they may waive the right to require such money, and accept credit currency, or commodities, other than gold and silver, and the United States, as creditors, or in the exercise of their express power to lay and collect taxes, duties, imposts, and excises, may, if they see fit, accept the treasury notes or bank bills in such payments as substitutes for the constitutional currency. ”
