Update 09 November, 2023

[Anselme]

@digipl

If I lose all the CN or CNR information on my computer, can I recover it from the network?

@happybeing

if you only keep your CN or CNR locally and lose both, you can’t recover the value from the network?

Currently if you loose them and didn’t store them on the Network, you can’t recover them.

@anon26713768

I get that they are worthless without the PK but could I encrypt that and store it on the network too?

@happybeing

or does the network automatically store information (perhaps the CNR?) which ensures the wallet holdings can be retrieved so long as you have the private key and wallet address (i.e. Main Public Key)?

The Network does not store this information automatically as of now. On the other hand, a good wallet implementation in my opinion should backup those on the Network as you suggest, so you only have to keep your secret key (from which you can generate your MainPublicKey).

@to7m

In particular, I don’t understand how a node can receive a CashNoteRedemption and verify that it is legit.

This would take a while to explain but to make it simple, the CNR contains a NetworkAddress and a secret DerivationIndex. With both this secret and the data found at the NetworkAddress (address of a SignedSpend), the owner can re-create the CN.

@Southside

What is the practical upper limit and what determines the size of the CN?

The size depends on the size of a Tx: cf here for a practical example.

@dirvine

we can recreate the Cashnote from the CNR with our secret key.

Yes we can re-create CN from a CNR + secret key! Without the secret key the CNR is indeed useless.