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Given that Taproot (SegWit v1) addresses are basically equivalent to a public key -- does that mean that there are a full 2256 possibilities? Or is the overall number of possible addresses reduced in some way?

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Taproot outputs contain x-only (tweaked) public keys. Due to the lack of Y coordinates, the number of valid keys is halved.

The exact number of possible x-only keys is 2255 - 216210193282829828426210433197484072800.

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  • The other half can still be made into valid SegWit v1 outputs (and therefore addresses), even though they would not be spendable, right? Dec 10, 2022 at 21:58
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    That's right. The address format can encode X coordinates that don't have corresponding public keys, but any coins sent to such an output are irrevocably lost. Dec 10, 2022 at 22:09

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