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Support for multi-sig/threshold signature scheme #91

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osuketh opened this issue Mar 31, 2019 · 4 comments
Open

Support for multi-sig/threshold signature scheme #91

osuketh opened this issue Mar 31, 2019 · 4 comments

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@osuketh
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osuketh commented Mar 31, 2019

It would be a group-based style. Public group key is used as an accountId.

@burdges
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burdges commented Apr 1, 2019

Jubjub or BLS or some zk thing?

If JubJub then Schnorr multi-sigs require three round trips between all signers. I've included references with the schnorrkel musig implementation on Ristretto https://github.com/w3f/schnorrkel/blob/master/src/musig.rs but you'd want need Ristretto for JubJub or to address the cofactor. We'll eventually devise some two round trip variant of mBCJ w3f/schnorrkel#15 but not actually working much on that right now.

It's dangerous to use BLS for accounts for a few reasons, like HDKD breaks BLS with typical malleability.

@osuketh
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osuketh commented Apr 1, 2019

It would be jubjub. The scheme might be the following and I'm actively researching on it.

I actually intended to implement Ristretto for jubjub in a different context, so your information is helpful! Thank you so much.

@burdges
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burdges commented Apr 1, 2019

You might find https://github.com/w3f/schnorrkel/blob/master/src/musig.rs useful then since it already expresses the musig protocol in session types.

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