Support Contract Deployments & Interactions with a Multisig

[wottpal]

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[statictype]

what do you mean?

[wottpal]

Of course, sorry I should have done this in the first place: Professionally deployed smart contracts that have admin- or upgrade capabilities should not be governed or deployed by a single wallet, but instead a multisig account. Doing so is right now only supported by either using polkadot.js/apps or custom scripting as far as I know.

The process looks like the following:

1. You initiate the deployment transaction on one machine (probably by passing a special flag/function to indicate that it's an "unfinished" multisig transaction.
2. Copy over the call-data hash to all necessary signatory machines and continue/finish the transaction there.

Would be nice to make this possible within contracts-ui as well.