How to rehearse a seed phrase restore without ever typing your real phrase into anything

"Test your backup" is advice everyone gives and almost nobody explains, so here is the version with steps in it.

The problem with testing a real backup is that the obvious way to do it is the dangerous way. If you type your actual recovery phrase into a second wallet to see whether it works, you have just widened the number of places that phrase has existed. The rehearsal below avoids that by practising on a phrase that protects nothing.

1. Create a throwaway wallet.** Any BIP39 wallet will do. Write its phrase on a scrap of paper you intend to destroy afterwards. This phrase exists to be treated carelessly.

2. Fund it with an amount you would not mind losing.** A few dollars is enough. The amount matters only because a zero balance cannot tell you whether the restore worked.

3. Remove it.** Wipe the throwaway wallet, or do the next step on a different device. Either way the goal is to arrive at a blank slate.

4. Restore from the throwaway phrase.** This is the part you are actually practising. Where does the restore option live. How many words does the wallet ask for. Does it ask for a passphrase, and what happens if you leave that blank. Does it ask which derivation path to use.

5. Confirm two things, not one.** The balance should come back, and the first receiving address should match what it was before. A balance alone can be a coincidence of a default path. A matching address means you restored the same wallet rather than a different one.

Three failure modes this catches before they matter:

The phrase is fine but the setup is not. A correct phrase entered into a wallet expecting a passphrase, or using a different derivation path, shows an empty balance. People conclude their backup is broken when the words were right the whole time.

The order was not recorded. Plenty of backups have all the words and no reliable record of the sequence. You find this out the moment a restore screen asks for word 7.

You have no idea where the restore screen is. Under stress, on a device you have wiped, is a bad time to be learning an interface for the first time.

And one it does not catch, because being honest about the edges is more useful than a clean list: this rehearses the mechanics, not the storage. If your real phrase is somewhere it should not be, or somewhere nobody else could find it if they had to, a rehearsal will not surface that. Those are separate problems with separate answers.