Xverse warns you when spending those rare sats.
How do they define a rare Sats?
What about I don't want to send a Sat because its date just commemorate my wedding day or something quite personal.
Well not quite interested in it been rare, just curious if the Bitcoin protocol allows such transactions.
So a third party is needed to accomplish this?
tells you what sat ranges your utxos contain. Example:
https://ordinals.com/output/3ea3bc8d7991869294ce43450eefee0de47a592417a59bd440e7d15fe74f4824:15 This utxo has 600 sats: 45039459700-45039460300 (600 sats). There are 5000000000 mined in a block from the first epoch. You can observe that this particular utxo has satoshis from the first Bitcoin mined by satoshi in block 9.
If you want to preserve some rare sats (let's assume you find them in a bigger utxo), you can split that utxo into 3: sats before the offset of the ones you're interested in, sats that you're interested in, sats after the ones you're interested in. Then you keep the utxo with the sats ur interested in safe. there are already tools built for this.