We are currently live with GBP and EUR implemented as ERC20 token-contracts on the Ethereum mainnet.
We provide daily and ad-hoc proof-of-funds – these are account statements digitally signed by the credit institution holding the collateral.
GBP:
https://bit.ly/3az1FZn EUR:
https://bit.ly/2Jfroux
The underlying Solidity code is open source. Our solution is flexible with respect to underlying protocol and token standard.