Unknown btc transaction Could someone please explain what is this second transaction from the wallet 34UuFs8BtnbeJtdM9p4NBCHiP8MaD4f86n ?
https://www.blockchain.com/btc/address/34UuFs8BtnbeJtdM9p4NBCHiP8MaD4f86n?filter=6

I didn't make the transaction with hash c454a01256ba3a4831f0bd02ada0a6bddb6d4c92d9b93af22938daf82b3d23dc

and it is not reflected in my wallet, also, it has not decreased my balance.
So, what can it be ?
it's clear that you have custodial wallet such as coinbase or localbitcoins so, they are controlling your wallet, and you don't own your wallet master key.

I suggest you use Bitcoin-core or electrum since they give you full access to your bitcoins and nobody ever has access to your wallet.