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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.

John Smith
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  • what wallet software are you using? And you mean .001 BTC? The only one that I could see was this one: 5f48a419f861ca157e938492a5a8550a85c4d93749cd7d2bcdb9822be6ee9b3b – JBaczuk Aug 02 '18 at 20:16
  • 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 Aug 02 '18 at 20:46
  • Yeah it looks like change, and it's not .01BTC every time. – JBaczuk Aug 02 '18 at 20:46
  • 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 Aug 02 '18 at 20:50
  • @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 Aug 02 '18 at 22:22

1 Answers1

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See above link about How change works. Looking at this transaction 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, thus a different address), but is presumably still spendable by your wallet.

JBaczuk
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  • 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 Aug 02 '18 at 22:20