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It is better if you move your bitcoins first before you go claiming shitcoins with the same private keys. This way your bitcoins are not at risk.

Of course. I always move them first. But they're still within the same xpriv.

Maybe in the future, I just create a new xpriv using the seed extension.

What do you think about this:

Using the example mnemonic: marine annual label breeze dice organ tunnel burst mad hand success author, which produces the xpriv

xprv9s21ZrQH143K2Hene3ragUxFzuqm84Juqy5HWqa7q9MHeKXDanZ74kTuA1h8voKgCPaimDAwhtN 6zSLrEMXwAVDZrCYjK9HJSMiYtonWKtc.

Then when the time comes, I use WarpWallet [1], using as input

marine annual label breeze dice organ tunnel burst mad hand success author-1

and the resulting private key 5KSE1...C7Zv7ts as seed extension, giving me the xpriv

xprv9s21ZrQH143K3uAeNvnfBTXpeaXj9VJ7UPSr5jnfEkB9KMhiFQmUtzPRPn3mqVLmzgjyDvJCtbW hFhyEm5D6MkgjaXRYRGHn5JEqF4Ss6Vc.

Then send everything over to the new wallet, claim the fork-coins, and repeat with appended -2 the next time I do something risky involving the xpriv.

[1] https://keybase.io/warp/warp_1.0.9_SHA256_a2067491ab582bde779f4505055807c2479354633a2216b22cf1e92d1a6e4a87.html

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