Allow setting restoration point for a wallet created from an xpub

[Melraidin]

Why?

In #4382 support was added to allow restoring a wallet from a given block. This would be especially useful for my purpose as we know when creating the wallet at cardano-wallet that no transactions would have occurred prior to this creation.

Is it possible to add this support? Along with this, is it necessary to specify both a block hash and an absolute slot number when setting this restoration point?

What?

Add support to match the functionality of the restoration_point when creating a Shelly wallet from an xpub.

How?

No response

[abailly]

Thanks a lot @Melraidin for the proposal, we'll definitely have a look.
Furthermore, I would be interested in knowing more about the context in which you are using cardano-wallet, would you be available for chat with the team?

[abailly]

is it necessary to specify both a block hash and an absolute slot number when setting this restoration point?

Usually yes, because the way it works is the cardano-wallet will start synchronising with the cardano-node from the given point and the node's API requires giving a slot number and a block hash. This is so because in general, it is possible for different nodes to have different blocks at the same slot: Cardano is only eventually consistent and node converges after some time, so if you make a query which is not beyond the Security parameter, slot and hash disambiguate what you are looking for.

[abailly]

@paolino You worked on the feature referred to in the description, any insights?

[Melraidin]

We're making use of cardano-wallet to track offline wallets. As it stands right now this poses some difficulty as we generate the wallet offline then create it at cardano-wallet from the xpub. This creates some delay while we wait for cardano-wallet to sync the wallet before any deposits may be discovered.

I'm happy to talk more in depth about our project, please let me know how to best contact you.

[abailly]

If you could book a meeting on my calendar, that would be awesome: https://calendly.com/arnaud-bailly-ext-cardanofoundation/30min

[abailly]

@Melraidin Thanks for taking the time to talk with the team, that's been helpful to understand better this particular issue and the general problem you're facing. I have created a discussion to explore some potential solution to your problem, feel free to comment if you will: #4981

[abailly]

@Melraidin The issue should be fixed in recent commit, would be able to validate it fits your purpose?