<p>See above link about <a href="https://bitcoin.stackexchange.com/questions/736/how-does-change-work-in-a-bitcoin-transaction">How change works</a>. Looking at this transaction <a href="https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b" rel="nofollow noreferrer">5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b</a>:</p>

<p>(Assuming) you tried to send <code>.001 BTC</code> to <code>1PqarrL2NAobkNbExtjBA1KEzXk7rwPfGQ</code>, but there did not exist any unspent transaction outputs (UTXO) to satisfy that exact amount (plus tx fee). So your wallet chose to use the UTXO worth <code>0.01105895 BTC</code>. It then sent the change (minus tx fee) back to your wallet in a separate output to <code>147FWjxpW9nYo5Z32qaHSoUZbVCNgsPGuL</code>. The address for the change is different because it is based on a different public key (it is a <a href="https://en.bitcoin.it/wiki/Transaction#Pay-to-PubkeyHash" rel="nofollow noreferrer">hash of a public key</a>, thus a different address), but is presumably still spendable by your wallet.</p>

CC BY-SA 4.0
2018-08-02T22:20:31.360Z
allright ! good to know, that's why my wallet software doesn't show the "lost" funds since there is NO lost funds. Thanks a lot for this explanation and I feel way better knowing that I haven't lost some digital gold hehe.
John Smith
CC BY-SA 4.0
2018-08-02T21:09:14.137Z
2018-08-02T21:09:14.137Z
JBaczuk
<p>Each time I send some btc to another bitcoin wallet there is a second transaction on the same transaction ID (hash) and each times i am loosing around 75 USD.</p>

<p>You can see by yourself here;</p>

<p><a href="https://www.blockchain.com/btc/address/1NrZWuS4J8MAqX63NHFuLrdmBYf6FttX29" rel="nofollow noreferrer">https://www.blockchain.com/btc/address/1NrZWuS4J8MAqX63NHFuLrdmBYf6FttX29</a></p>

<p>Another weird fact is that on my bitcoin wallet software balance, it's not showing to balance I lost.</p>

<p>Any help would be very appreciated,</p>

<p>Thanks.</p>

CC BY-SA 4.0
2018-08-02T20:16:01.810Z
what wallet software are you using? And you mean .001 BTC? The only one that I could see was this one: 5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b
JBaczuk
CC BY-SA 4.0
2018-08-02T20:46:29.127Z
Bitcoin Core Wallet from https://bitcoin.org/en/download

No, I really mean 0.01 BTC

https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b

https://www.blockchain.com/btc/tx/9d9659dc3633588757798eaf17b8fd19051619561b376384e528271a66df6633

https://www.blockchain.com/btc/tx/50595313b33a2ea0b0a1c2fba5f71a73d72414060d161563d659163930c0145d
John Smith
CC BY-SA 4.0
2018-08-02T20:46:31.003Z
Yeah it looks like change, and it's not .01BTC every time.
JBaczuk
CC BY-SA 4.0
2018-08-02T20:50:37.797Z
Please have a look on those transactions, you can clearly see 2 different wallets with 2 different transaction on the same transaction ID (hash)

https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b

https://www.blockchain.com/btc/tx/9d9659dc3633588757798eaf17b8fd19051619561b376384e528271a66df6633

https://www.blockchain.com/btc/tx/50595313b33a2ea0b0a1c2fba5f71a73d72414060d161563d659163930c0145d
John Smith
CC BY-SA 4.0
2018-08-02T22:22:37.670Z
@JohnSmith to clarify: you are confusing terms slightly, a 'wallet' is software that holds a collection of keys, and those keys let you spend bitcoins at addresses related to them. I believe what you are calling a 'transaction ID (hash)' is actually just a bitcoin address. Looking at the 3 txs you linked, I see three UTXOs from the same bitcoin address (`1NrZW...`) being spent to various addresses, with what appears to be a change address generated for each transaction. See the other replies for info on what a change address is. That should answer your main question.
chytrik
<transactions><bitcoin-core><blockchain><wallet><transaction-fees>
Double transaction on same hash (transaction ID) - Loosing 0.01 btc each time
John Smith
# Double transaction on same hash (transaction ID) - Loosing 0.01 btc each time

(Asked by: username_0 on 2018-08-02)

Each time I send some btc to another bitcoin wallet there is a second transaction on the same transaction ID (hash) and each times i am loosing around 75 USD.

You can see by yourself here;

<https://www.blockchain.com/btc/address/1NrZWuS4J8MAqX63NHFuLrdmBYf6FttX29>

Another weird fact is that on my bitcoin wallet software balance, it's not showing to balance I lost.

Any help would be very appreciated,

Thanks.

**Tags:** transactions, bitcoin-core, blockchain, wallet, transaction-fees

> **Comments:**
> **username_1**: what wallet software are you using? And you mean .001 BTC? The only one that I could see was this one: 5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b  
> **username_0**: Bitcoin Core Wallet from https://bitcoin.org/en/download  No, I really mean 0.01 BTC  https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b  https://www.blockchain.com/btc/tx/9d9659dc3633588757798eaf17b8fd19051619561b376384e528271a66df6633  https://www.blockchain.com/btc/tx/50595313b33a2ea0b0a1c2fba5f71a73d72414060d161563d659163930c0145d  
> **username_1**: Yeah it looks like change, and it's not .01BTC every time.  
> **username_0**: Please have a look on those transactions, you can clearly see 2 different wallets with 2 different transaction on the same transaction ID (hash)  https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b  https://www.blockchain.com/btc/tx/9d9659dc3633588757798eaf17b8fd19051619561b376384e528271a66df6633  https://www.blockchain.com/btc/tx/50595313b33a2ea0b0a1c2fba5f71a73d72414060d161563d659163930c0145d  
> **username_2**: @username_0 to clarify: you are confusing terms slightly, a 'wallet' is software that holds a collection of keys, and those keys let you spend bitcoins at addresses related to them. I believe what you are calling a 'transaction ID (hash)' is actually just a bitcoin address. Looking at the 3 txs you linked, I see three UTXOs from the same bitcoin address (`1NrZW...`) being spent to various addresses, with what appears to be a change address generated for each transaction. See the other replies for info on what a change address is. That should answer your main question.  

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## 1 answers

### Answer by username_1 on 2018-08-02. Score: 1

See above link about [How change works](https://bitcoin.stackexchange.com/questions/736/how-does-change-work-in-a-bitcoin-transaction). Looking at this transaction [5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b](https://www.blockchain.com/btc/tx/5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b):

(Assuming) you tried to send `.001 BTC` to `1PqarrL2NAobkNbExtjBA1KEzXk7rwPfGQ`, but there did not exist any unspent transaction outputs (UTXO) to satisfy that exact amount (plus tx fee). So your wallet chose to use the UTXO worth `0.01105895 BTC`. It then sent the change (minus tx fee) back to your wallet in a separate output to `147FWjxpW9nYo5Z32qaHSoUZbVCNgsPGuL`. The address for the change is different because it is based on a different public key (it is a [hash of a public key](https://en.bitcoin.it/wiki/Transaction#Pay-to-PubkeyHash), thus a different address), but is presumably still spendable by your wallet.

> **Comments:**
> **username_0**: allright ! good to know, that's why my wallet software doesn't show the "lost" funds since there is NO lost funds. Thanks a lot for this explanation and I feel way better knowing that I haven't lost some digital gold hehe.  

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