Check my post https://tiangong.space/nip5-verification/

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NIP-05 is not verification. it's an identifier. please stop referring to it as verification. read the spec. the spec mentions verification zero times.

Why am i able to create npub from btc txid (hex) using Nip-05? Do i own all those npub keys?

Just asking...

No, because you don't have the corresponding nsec.

Also it's NIP-19, NIP-05 is for the email-like identifiers. See: https://github.com/nostr-protocol/nips/blob/master/19.md

Can nsecs be created using npubkeys?

No. It's a one-way operation (cryptographic function).

Can you create an nsec from the npubkey created from hex?

appreciate 👏