multisig with hardware wallets

[ulrichard]

I opened issues about multisig with hardware wallets on electrum, but Denis Letourneau asked me to also post them to encompass.
So here we go:
spesmilo/electrum#1093
spesmilo/electrum#1094

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[guruvan]

@ulrichard Thanks for this. We're working on a few things that you & @ELM4Ever will want

1. Electrum compatible multisig
2. MofN multisig
3. multisig via trezor

[ulrichard]

Sounds great. I'm looking forward to it.
Will it also support HW1 (btchip) ?

[guruvan]

It will be some time before that wallet is supported - mutlisig issues are much more of a priority.

[ELM4Ever]

Electrum has enabled Multisig with Trezor at commit c224a9a

[Kefkius]

Awesome, thanks @ELM4Ever. Will jump on that soon.

[ELM4Ever]

One caviat: looks like the current Electrum implementation lets you co-sign a transaction with Trezor only if you used the Main Account xpub to create the multisig wallet. If you use a second or third account xpub to create the wallet, when comes times to ask Trezor to sign the partially signed transaction, nothing happens. I also found that Trezor has to sign last (again with the current implementation), since Electrum 2.4.2 doesn't offer the option to create a Trezor + multisig wallet.

The procedure I used is:

1. Create new + Multisig wallet. (provides seed - copy - confirm seed - paste)
2. In the window providing the new multisig wallet XPUB
3. Enter the Trezor main account xpub in the second pane (can be obtained from mytrezor.com or Electrum/Encompass)
4. Electrum creates a multisign wallet.
5. No method that I have seen to create a reciprocal wallet with Trezor (by entering the co-signer xpub)
6. Send funds to it, and then try to send funds back out. Sign and save partially signed file.
7. Open a normal Trezor wallet.
8. Tools --> Load partially signed TX, and sign with Trezor - then broadcast