Many of the major exchanges may be holding a lot of BTC, USDT, USDC, and DAI dust. If your going to be taking your coins off the exchange for Proof-of-Keys, take the time to get the full balance and withdraw all the way down to the last satoshi.
For example, coinbase has the "full-balance" listed through the API at:
https://api.pro.coinbase.com/accounts
You can pull the sample python2 code from their API docs.
I found that I actually had 0.00000795 in DAI, 0.0049066389365 in USDC, and 0.0000000074 in ETH on my account. Most of the user interfaces listed the balance as 0.
To withdraw the small amounts, just enter the full balance in the withdraw page instead of relying on "MAX".
May seem futile, but if they have a half penny for each of the 30 million customers, that is over 21 BTC that could be taken off their books.
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