I can see transactions with version 0. Are there any other versions of SegWit proposed or in existence?
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Taproot is implemented as SegWit version 1.
Another proposed feature that would most likely be implemented as a new SegWit version is cross-input signature aggregation.

Vojtěch Strnad
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BIP-114 which was published a while ago comes to mind : https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki

arubi
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The introduction of Schnorr signatures would require a new script version.

Murch
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