Most btc airdrops I have seen require you to prove you control the btc address by inputting your private key. You really don’t want to be doing that with funds on the address, so you would need to move them. However, with fees and transactions fees as they are at present and the fact that most new issues are pretty worthless at point of issue, it’s usually not worth it.
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Agreed. I have never dealt with any airdrops requiring me to provide more than an address.
Which ones are they? A public address proves nothing as it is by its nature public. Providing the private key does prove you own the address but it also means someone else could control that address.