Whereas a silver certificate will say:
"THIS CERTIFICATE IS REDEEMABLE FOR ALL PUBLIC DUES AND WHEN SO RECEIVED MAY BE REISSUED." 1928-A
...a United States Note or Legal Tender Note (or even a Federal Reserve Note) will say:
"THIS NOTE IS A LEGAL TENDER AT ITS FACE VALUE FOR ALL DEBTS PUBLIC AND PRIVATE EXCEPT DUTIES ON IMPORTS AND INTEREST ON THE PUBLIC DEBT."
So my question is this: What's the legality concerning the circulation of silver certificates in the USA? US Notes and FRNs are legal tender, decreed by law, whereas the silver certificate is only a certificate, not money, that held a promise that has now been broken. There are no more silver dollars held by the US Treasury, am I correct in assuming so?
The FRN totally usurped the image of the silver certificate and we all know that the design hasn't changed since the 1930s - only the wording, seals, and legality of the note has changed. I'm sure y'all are just as confused. I know that silver certs sometimes circulate in the USA, but legally speaking should they? They hold no value except to pay public dues!

So you can pay taxes with silver certificates but not with United States notes? (I'm aware of the wording on silver certs post-1928 [e.g.1934] that are the same as US Notes. "THIS CERTIFICATE IS LEGAL TENDER FOR ALL DEBTS, PUBLIC AND PRIVATE.")