Re: Zcash-Bitcoin XCAT POC demo (Friday 25th Aug, 7pm BST)

Hey Jack, thanks for this! Jay was at our workshop in Berlin and I think
managed to do an Interledger integration for ZCash. Not sure if she ever
published her code?

As with Lightning, I don't see this as an alternative to Interledger but
really as a specific implementation of the same HTLC concept on which
Interledger relies for long chains of XCATs.

What we're trying to do is define the interop layer that needs to exist
above these systems in a protocol stack so that you can chain XCATs
together, irrespective of how they are implemented, to acheive a secure
end-to-end payment.

The crucial ingredients are:
a) A universal addressing scheme
b) A standard for the HTLA locks

Interledger defines an address space that we think is appropriate for this
use case and then defines the SHA-256 hash as the standard for the locks.
This is a useful common denominator across many existing systems so it's
useable on top of Zcash, Lightning, Bitcoin, XRP and others and can easily
be adopted by networks that don't yet support hash-based time locks.

Have you looked at Evan's breakdown of the different HTLAs (we generalized
HTLCs to be "agreements" to allow for those that are not enforced
cryptographically):
https://interledger.org/rfcs/0022-hashed-timelock-agreements/

On 24 August 2017 at 14:26, Jack Gavigan <jack@jackgavigan.com> wrote:

> Hi,
>
> This is *slightly* off-topic, but relevant for anyone who's interested in
> cross-chain transactions.
>
> At Zcash, we've been working on implementing cross-chain atomic trades,
> and we'll be doing a "show'n'tell" to demonstrate the progress we've made
> so far tomorrow Friday 25th August) at 7pm London time (BST). You can watch
> at: https://www.youtube.com/watch?v=nPvfn138PRg
>
> At this stage, we only support transparent transactions on the Zcash
> network but, in time, we expect that upgrades to the crypto and the
> protocol will make it possible to use shielded transactions.
>
> Date: Friday 25th August 2017
> Time: 19:00 BST
> Link: https://www.youtube.com/watch?v=nPvfn138PRg
>
> ​Regards,
>
>
> Jack Gavigan
>
> ​COO, Zcash​
>
>