And if you want to check the circulating amount of BNKs, you can check it directly on the BNK contract by calling the function '23. issuedTokensInRound'
Was unaware of this avenue. Are there any further contract calls applicable to BNK circulating supply? Particularly I would be interested in all the coins being held by investors, i.e not traded on market.
No, it is not possible to obtain information about accounts and their transactions.