Quote from: nullius on December 24, 2017, 12:51:11 AM

Quote from: Darooghe on December 24, 2017, 12:21:57 AM

Hello

I realized recently that making fake transactions are possible. I know no one can undo any transactions, either.

I want to know is there any way to detect that a certain unconfirmed transaction is fake or not, right after sending?

This is a big problem for me because of so many unconfirmed transactions that i'm getting nowadays.

Run a full node for validation, too. SPV and other light clients can be fooled by certain attacks. I dont think an SPV node could be made to accept a fake transaction, in and of itself; but it could be misled onto a forkchain, which would allow feeding it a whole ledger full of fake transactions.

You are so technical and it isn't good for ordinary people.
But i can't run a full node. Also i don't understand how a full node can detect a fake transaction before confirmations.

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What do you even mean by a fake transaction? Thats a meaningless phrase which could mean anything. Generally, no, fake transactions are not possible.

Fake transaction like this:
https://blockchain.info/tx/ba8a7fb13a507a4987bfa267a6f12defc0d30216fdf6664cdc06cc4c8de71a84

This tx is happened in blockchain.info and this is still unconfirmed. But it isn't happened in blocktrail.com.

Quote from: nullius on December 24, 2017, 12:51:11 AM

If youre worried about unconfirmed transactions, wellyou should be. Wait for confirmation. Unconfirmed transactions are insecure; they could turn out to be fake in the sense of a being overridden with a double-spend. Thats why the process of confirming transactions exists in the first place!

Double-spend isn't big problem here.
I can detect it by checking final balance and last transactions of sender address that all it's transactions are confirmed.

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Also, if it is not a Segwit transaction, then before confirmation there is the tx malleability issue to worry about. Segwit fixes tx malleability.

I don't understand it. all BTC transactions after 1st aguest 2017 are Segwit, aren't?

I do services and get BTC from people for it. I can't wait 5 days for confirmations. Bitcoin is not user-friendly any more. I think I should choose another coin very soon