halt and dissolve parent bridge

[johannbarbie]

Bounty

once childchain circulating supply > parent bridge capacity becomes true, or other invalid transactions are observed in the system, it has to be assumed that a majority of validators became malicious and colluded. At this point the trustee needs to step in, cancel all withdrawal cells, stop the bridge, and distribute remaining funds to sidechain users according to the last valid state of the network.

Scope

• check actionbyte and signature by trustee in the witness.
• accept any distribution that spends all capacity.
• make sure the bridge thread is discontinued.
• consider question: can trustee be a multisig?

Deliverables

• code
• tests

Funding Circle

Bounty Owner/Gardener

<@your github username> as

Gain for the Role

Roles

bounty gardener: @johannbarbie / 15%
bounty worker: name / share
bounty reviewer: name / share

Gardener checklist

• I have attached one of the size- labels to this bounty
• I have submitted this bounty via http://bounty.leapdao.org/viewform
• I have added this bounty to bounty board here https://github.com/orgs/leapdao/projects/6