1. Storage of Keys, Addresses and so forth
How precisely is all this saved?
In Common
Any means that the builders of a selected pockets need. It’s probably that totally different wallets retailer their information in another way.
In Bitcoin core, for instance.
The pockets software program named “Bitcoin core” will retailer the personal keys within the pockets.dat file within the specified or default information listing. The default is %APPDATA%/Bitcoin/ or ~/.bitcoin/ relying on platform. If a pockets password is offered, the important thing information is saved in encrypted type with the password being the encryption key (probably not directly and doubtless utilizing AES IIRC).
The addresses generated are saved in the identical file however needn’t be encrypted.
I do not know if the complete derivation paths are explicitly saved. I think about that a minimum of the least important digits must be saved together with every derived handle. Perhaps somebody can remark.
BDB vs SQLite wallets
The general organisation of this file has modified and relies on easy key-value database libraries, initially Berkeley-DB (BDB) and extra not too long ago SQLite AFAIK.
Descriptor vs non-Descriptor wallets
The keys and values have modified from the unique type to a “descriptor” type. So there are non-descriptor wallets and descriptor wallets.
HD vs non-HD wallets
There was additionally a change to Hierarchical Deterministic (HD) wallets from the unique non-HD pockets.
2. Derivation Paths
I see that every one addresses are recognized utilizing a path naming conference. Does that imply that every one the paths are saved, and in a situation the place an handle must be reused, it’s regenerated every time?
These are implementation particulars. I do not know the way Bitcoin core or different wallets deal with this and I consider anybody writing a pockets ought to make their very own choices.
If writing a pockets app, I might in all probability explicitly retailer all generated addresses and paths. Another folks would do one thing very totally different.