bitcoinbook VS BlueWallet

"Mastering Bitcoin" by Andreas M. Antonopoulos: The printed version is not free, the complete text is available on GitHub. It's an excellent resource for understanding Bitcoin from a technical perspective.

The target is stored in the block header. You can see it in any block explorer labeled BITS or nBits. It is stored in a compressed format, as described in Mastering Bitcoin https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch10.asciidoc Scroll down to "Target Representation"

Mastering Bitcoin is a free book - https://github.com/bitcoinbook/bitcoinbook

I also highly recommend that you Read this book "Mastering bitcoin", its free and open source: https://github.com/bitcoinbook/bitcoinbook

You should read this chapter - it kinda explains why the chip need to be able to manipulate and access the private key. It works exactly the same way for every hardware wallet.

BlueWallet does not support Taproot, see https://github.com/BlueWallet/BlueWallet/issues/3880.

Thus you will import the seed into a better wallet like https://bluewallet.io that can sign the transaction

just use BlueWallet - https://bluewallet.io/ :-) I think it is easier than sparrow

https://bluewallet.io - excellent, easy to use wallet, Open Source and Non-Custodial

If $100 or more, there are some good suggestions like BlueWallet (https://bluewallet.io/).

Exactly this. Blockstream Jade hardware wallet used with Sparrow wallet on a laptop with linux, to make transactions. Then Bluewallet for a watch-only wallet on your phone device.

I also use my blockstream jade airgapped with sparrow wallet on a linux laptop which I have been extremely happy with. You can also use BlueWallet for phone.