The programmes for transition to national currency were finished in November 1990 and the next year started the preparations for monetary reform.
Otsason participated in the work of Monetary Reform Committee established on 27 March 1991 and led by Prime Minister Edgar Savisaar.
He signed on 10 May 1991 a contract with the company Thomas De La Rue & Co Ltd. for printing banknotes of Estonian kroons.
Otsason was decorated by the President of the Republic with the Estonian Order of the Coat of Arms, 4th class (2003).
Otsason was a member of the Union for the Republic - Res Publica and was a candidate at the 2003 Estonian parliamentary election.
He was elected to the Estonian Parliament (Riigikogu), but turned down his seat and decided to continue his work in the bank.