fake btc transaction

[tsoler11]

hello someone he told me that he have fake btc transaction i didnt trust him
he did a test to my wallet i received notification about it
check
https://www.blockchain.com/btc/tx/7e44600f9066566a4e6e579e0750d5e075f369b7e13fa5dd91896b6eb82cc7b9
is this possible ? or what happen exactly ? please can someone give explanattion , he tell me he have paid fees only

[ranochigo]

The inputs for that transaction was spent in 4b483d81bcfadc62278fb456d7ead952639b052075cde3c156ee5314d4e039f8 to a different address. It is possible to create different transactions that spends the same inputs but are spending to different addresses. As it is confirmed, the transaction that you have referenced is now invalid.

UTXOs cannot be spent twice, in the event of two competing transaction, the transaction which confirms first wins and the the other will be invalid.

[tsoler11]

its trick or what exactly how he do it he claim he have a tool

[DaveF]

No special tool needed. You just have to set up the previous transactions with RBF and a low fee.
Then you send another transaction with a higher fee and the other entire bunch of unconfirmed low fee transactions are no longer valid.

-Dave

[HCP]

It was actually a parent transaction that got "double spent"... so it seems this person had created a short chain of at least 2 unconfirmed transactions, then double spent the parent.

This then invalidated both the OPs tx: https://www.blockchain.com/btc/tx/7e44600f9066566a4e6e579e0750d5e075f369b7e13fa5dd91896b6eb82cc7b9
and it's parent: https://www.blockchain.com/btc/tx/97c73b235dc0c97c2d59f11f9f03f493cd4d88732d8cde3077bc0d549d15a3e8

[pooya87]

its trick or what exactly how he do it he claim he have a tool

No, this is how bitcoin has always worked starting from the first day. In proof of work algorithm the transactions are only finalized when they are included in a block. That means as long as they are not confirmed (are in mempool) they can be double spent.
This is why majority of services accepting bitcoin payments have always required at least one confirmation.

[tsoler11]

how this is possible , when i sent from coin base they disappear from my wallet

[BitMaxz]

how this is possible , when i sent from coin base they disappear from my wallet

It won't work on Coinbase you can only do this on non-custodial wallets like Electrum where you can able to double spend the transaction.

Read this wiki about this https://en.wikipedia.org/wiki/Double-spending

Actually, this is not advisable to learn if you are going to use it for scamming.

[nc50lc]

how this is possible , when i sent from coin base they disappear from my wallet

One reason is you/they may have set a very low fee rate that most nodes had dropped it from their mempool upon reaching the set/default maximum size.
That includes the mempool of your wallet's node or server for SPV clients.

Note: it only happens when there are too many transactions in the mempool and due to the limited space, the node has to drop the ones with the lowest fee rate.

[pooya87]

Think of double spending as writing checks, for example if you had $10 in your bank account and people had a way of checking your balance (like going to your bank's website, enter your back account and see your balance) if you write 10 checks each worth the same $10 to 10 people you are "double spending" your money and they are all valid until one and only one of them goes to the bank and cashes that check. By that time the other 9 checks become invalid immediately and if someone takes it to the bank it will be rejected.

In bitcoin there is no centralized bank but the concept is the same, you can create as many transactions as you like spending that specific output (the $10 balance) but one and only one of the transactions can be confirmed as nodes will reject the double spent transactions and after the tx was confirmed they remove that UTXO from their database hence making all the other txs invalid.

[Stroncow]

hello someone he told me that he have fake btc transaction i didnt trust him
he did a test to my wallet i received notification about it
check
https://www.blockchain.com/btc/tx/7e44600f9066566a4e6e579e0750d5e075f369b7e13fa5dd91896b6eb82cc7b9
is this possible ? or what happen exactly ? please can someone give explanattion , he tell me he have paid fees only

Can I apply this method to find the public key in the address of my lost BTC private key? I want to know my public key because I can easily access my private key with the Kangaroo software. How do they do this?

Note: 1 BTC was sent to my BTC address in 2017 and I have never withdrawn. Years later, I was left with compressed WIF code missing 18 characters.

[Saidasun]

Can I apply this method to find the public key in the address of my lost BTC private key? I want to know my public key because I can easily access my private key with the Kangaroo software. How do they do this?

Note: 1 BTC was sent to my BTC address in 2017 and I have never withdrawn. Years later, I was left with compressed WIF code missing 18 characters.

No there is no way to retrieve the private key unless you remember it or have backed it up somewhere. If you could retrieve the key as easy as your asking Bitcoin would not be as secure as it is. If you can not remember the private key and you do not have a backup there is no chance of you ever retrieving it.

You should backup private keys in a sensible and safe place just in case this happens again.

[Stroncow]

Can I apply this method to find the public key in the address of my lost BTC private key? I want to know my public key because I can easily access my private key with the Kangaroo software. How do they do this?

Note: 1 BTC was sent to my BTC address in 2017 and I have never withdrawn. Years later, I was left with compressed WIF code missing 18 characters.

No there is no way to retrieve the private key unless you remember it or have backed it up somewhere. If you could retrieve the key as easy as your asking Bitcoin would not be as secure as it is. If you can not remember the private key and you do not have a backup there is no chance of you ever retrieving it.

You should backup private keys in a sensible and safe place just in case this happens again.

I know the specific range because of my WIF code, Kangoroo can solve this range as soon as possible.

[nc50lc]

-snip-

Can I apply this method to find the public key in the address of my lost BTC private key? I want to know my public key because I can easily access my private key with the Kangaroo software. How do they do this?

Note: 1 BTC was sent to my BTC address in 2017 and I have never withdrawn. Years later, I was left with compressed WIF code missing 18 characters.

No, the only way to see an address' public key is check the "unlocking script" of a transaction that used it as an input (or if you have the private key of course).
So, have you used that address to send bitcoins even once? Inbound transactions do not count.

[Stroncow]

-snip-

Can I apply this method to find the public key in the address of my lost BTC private key? I want to know my public key because I can easily access my private key with the Kangaroo software. How do they do this?

Note: 1 BTC was sent to my BTC address in 2017 and I have never withdrawn. Years later, I was left with compressed WIF code missing 18 characters.

No, the only way to see an address' public key is check the "unlocking script" of a transaction that used it as an input (or if you have the private key of course).
So, have you used that address to send bitcoins even once? Inbound transactions do not count.

Sorry, I haven't sent any BTC. The public key of the address in the transaction number shared by the subject owner has emerged. I thought this was a method.

[seoincorporation]

The inputs for that transaction was spent in 4b483d81bcfadc62278fb456d7ead952639b052075cde3c156ee5314d4e039f8 to a different address. It is possible to create different transactions that spends the same inputs but are spending to different addresses. As it is confirmed, the transaction that you have referenced is now invalid.

UTXOs cannot be spent twice, in the event of two competing transaction, the transaction which confirms first wins and the the other will be invalid.

The transaction isn't fake, but the coins were double-spend just as ranochigo explained here.

But the transaction was real, signed with the correct private key and broadcasted to the network.

Double spends are common, it can be done by mistake or it can be done under propose. Some people use them to cheat users, casinos and exchanges, and this is the main reason why we have to always wait for a confirmation. That's the only secure way we have to be secure that the coins will not be double spent. 

[Stroncow]

The inputs for that transaction was spent in 4b483d81bcfadc62278fb456d7ead952639b052075cde3c156ee5314d4e039f8 to a different address. It is possible to create different transactions that spends the same inputs but are spending to different addresses. As it is confirmed, the transaction that you have referenced is now invalid.

UTXOs cannot be spent twice, in the event of two competing transaction, the transaction which confirms first wins and the the other will be invalid.

The transaction isn't fake, but the coins were double-spend just as ranochigo explained here.

But the transaction was real, signed with the correct private key and broadcasted to the network.

Double spends are common, it can be done by mistake or it can be done under propose. Some people use them to cheat users, casinos and exchanges, and this is the main reason why we have to always wait for a confirmation. That's the only secure way we have to be secure that the coins will not be double spent. 

I understand better now, thank you.