Valiollah Seif, who headed the Central Bank of Iran between 2013 and 2018, was charged with disturbing the order in the forex market and paving the way for illegal purchase and sale of foreign currency.
Six more countries have joined hands to back INSTEX, a mechanism that facilitates trade with Iran while circumventing US sanctions.
A policeman was killed in the western city of Kermanhshah in a clash with armed "rioters", the second confirmed death since protests erupted across Iran.
Iranian President Hassan Rouhani dismissed a US call for talks, hours before Washington reimposed new sanctions in line with President Donald Trump's decision to pull out of a 2015 agreement over Iran's nuclear programme.
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