My coins are in trezor, hard to get the private keys out, is it possible to still provide a claiming service?
I am also wondering if there is some way around the Trezor problem.
Now that my BTC are locked down in Trezor, I am unwilling to move them.
You can use Trezor with Electrum Wallet. No need to export private keys. You can simply sign messages with Electrum then.
But the question is still: Do both address types work? Segwit and legacy?