I'm trying to understand how Wrapped Bitcoin (WBTC) issuance can be verified.
The WBTC custodian, BitGo, published the following material:
This is a list of Bitcoin addresses linked to Blockstream explorer where you can verify the UTXOs each address has access to (wallet balances, if you will). The sum total of these balances is equal to the amount of WBTC minted by BitGo.
However, how do I know that BitGo has the private keys for those UTXOs? Am I supposed to just accept the bonafides of BitGo and their audits, or is the a technical way to remove that trust?