Double spending ?

[fe1t]

============ Block 03336ca7d60ba5344265de897b055fc2472681524a1751679c6ec17dc734ae70 ============
Height: 2
Prev. block: 09d26e7629fb8f5918faf0623351ba1f5740406fe29e6b433522b7441b34958e
PoW: true

--- Transaction e734d0dd763d10f1e4bb175bad312de1de51a6f08e7ddbc18300412f003f4654:
     Input 0:
       TXID:      598b4e12b0bd16e87f7cdd108a4361c27c147e943fe7742a807dd3d8d0a7f2db
       Out:       0
       Signature: 9802715ce2c6be6b5893c0ad6e77e13b9d6cf1a798b85e7597665edb297cf1e5f2af34a5c43235276bfd3215e6f3d1bf7e063538cec33d07e0b4e1dfce03e335
       PubKey:    7f3310fd561c9d414b9869c31431b649b304cf0177c743c9c3932584e9421102069a563840f3d076070a47c36479f56aa0453451e29e67b3e113c8d86ffa64a8
     Output 0:
       Value:  2
       Script: cf4459389be8f77df9ac2d41bb29e80f5f4120d0
     Output 1:
       Value:  8
       Script: 12facdbb0eb291427b4b9a4745b2553c5e659dc2
--- Transaction 3bb3cd1345d276e8e76345c8aa109089c9f06d37f471f0603e97fd38bdb88905:
     Input 0:
       TXID:      598b4e12b0bd16e87f7cdd108a4361c27c147e943fe7742a807dd3d8d0a7f2db
       Out:       0
       Signature: 0dae57ad9c2385a0977a758c4b0fb184a44cdf0558d768653b4b8669a47814c9c0df39a64fe913a8cab653b90a3cbbae2c56c92520da66892d522863e11f31b6
       PubKey:    7f3310fd561c9d414b9869c31431b649b304cf0177c743c9c3932584e9421102069a563840f3d076070a47c36479f56aa0453451e29e67b3e113c8d86ffa64a8
     Output 0:
       Value:  1
       Script: c9f24de063058507e8ada37a93b02e8f02218ebf
     Output 1:
       Value:  9
       Script: 12facdbb0eb291427b4b9a4745b2553c5e659dc2
--- Transaction e9e68fb36ddb0fb40f6dd7f24f2a867f33eb692c435765398257f8cc8e46cd55:
     Input 0:
       TXID:
       Out:       -1
       Signature:
       PubKey:    64353138386533393361346434363432306636316136333861636634386463656562343236643430
     Output 0:
       Value:  10
       Script: 85d3eb79bdacda199724477c03807f64de9db9ce

$ ./blockchain_go getbalance -address 12jMcbWjGr9nPKj4QvKGyjgDyLeBqwLjeG
Balance of '12jMcbWjGr9nPKj4QvKGyjgDyLeBqwLjeG': 17

As you can see, transaction input (598b4e12b0bd16e87f7cdd108a4361c27c147e943fe7742a807dd3d8d0a7f2db) was used 2 times.
Assume I have 3 wallets: A(10 coins), B(0 coins), C(0 coins). then i'm trying to send from A -> B(1 coins) and A -> C(2 coins).
first transaction: A -> B (1 coins) and A -> A (9 coins)
second transaction: A -> C (2 coins) and A -> A (8 coins)
that will result A will have 17 coins instead of having only 7 coins left.
A(17 coins), B(1 coin), C(2 coins) ??
P.S. both transactions happened in NODE_ID=3001
P.S.2 NODE_ID=3002 was miner node.

[alexwishes]

Same issue as you, I think it's a bug.
But this project is considered as a tutorial, bugs can be accepted...

[fe1t]

Okay, but do you have any solution for the case?
I've been trying to fix the bug many days but still got no luck :'(

[alexwishes]

Sorry, I only treat it as a tutorial and give it up...
I'll start to learn ethereum's code next step

[acehow]

It's just a tutorial. In real bitcoin, there need 6 more confirms to write blocks to chain.
And only longest chain will be affected. That's why bitcoin transaction speed is so low.
This tutorial not teach us those content.