Subnostr

How about txid?is it safe showing txid?

yes. txid is just receipt number

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And the txid they also provide pub keys/address and digital signatures?

Pubkey yes, if you use explorer to see.

Digital signature? Not your private key. But all your transaction record is shown.

In mainnet btc, all transaction is public

Are txid some type of digital signatures?

Or generate?

And you wouldn't be given a receipt number or txids unless you hold the private keys?