Quote from: Welsh on Today at 02:55:40 AM

Steel washers are decent at surviving most things, maybe not very high temperatures

You are pretty safe unless they are deliberately exposed to a furnace or similar. The melting point of stainless steel is well in excess of the temperatures reached in a house fire or similar.

Quote from: fillippone on Today at 04:45:45 PM

What is the point of storing this strange derivation together with the seed? He who control the seed, controls the deviation also.

There's not point storing them together, just as there is no point storing your passphrase alongside your seed phrase. But given that there are more possible derivation paths (by many orders of magnitude) than there are potential seed phrases, it could be used as a "surrogate" passphrase, so to speak, where an attacker would need to know your seed phrase and derivation path. I wouldn't recommend it, though.

Quote from: LoyceV on Today at 05:52:17 PM

Another thought: how fun would it be to use euro coins to stamp seed words into? Cheesy

Fun maybe, but a quick Wikipedia search tells me the alloys which make up these coins have a significantly lower melting point and tensile strength than stainless steel, so probably not recommended.