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This may be jumping the gun but does anyone know how the "half custodian" approach for splitting SegWit2x coins that's mentioned in this Ledger blog post will work?
The relevant text from the blog post is:
The “half custodian” process will involve a new Ledger application created for the Nano S and Blue (it will not be available on Ledger Nano) and will be fully automated. We’ll make available tainted inputs to our users with a contract enforced by the new application that sends back those tainted inputs to us — this is possible because our secure applications distribution architecture allows to securely share a set of keys with our users without revealing it. In other words, our splitting app will take care of everything automatically and with the highest levels of security.
What's a tainted input and a contract enforcing application?
So perhaps "half custodian" reflects that the Ledger software will set the nLockTime on the tx. Or perhaps they will take responsibility for broadcasting the tx and make an agreement with a friendly miner to try and get the tx included in a coinbase spending or large block. – sipwiz – 2017-11-07T23:33:36.400
It doesn't need to be included in either the coinbase or a block, it just needs to include some coins from a coinbase transaction at somepoint since the fork. All decedents of a coinbase transaction on one chain are invalid on the other – MeshCollider – 2017-11-08T00:00:58.493
Ah ok. So if Ledger have an agreement with a friendly miner they can get hold of some post-fork coinbase coins to include in the "custodian" transactions. They will still have the 100 block delay but that's less than a day and everyone will probably sit tight for at least that long. – sipwiz – 2017-11-08T00:05:58.693
Correct, that's the most likely situation from what I can tell :) – MeshCollider – 2017-11-08T00:20:13.567