I can not decode transaction in Bitcoin-QT.

The error is: TX decode failed (code -22). But blockexplorer site decode it.

Then I try to send transaction from blockcypher.com site, and the error is: Error validating transaction: Error running script for input 0 referencing c806c9ae2ac9c71fad307c9fedeca2133edb195cae9e924424885f57a63ba9a9 at 0: Script was NOT verified successfully..

Please help what is wrong. I check transaction structure by hand and check signatures. It's all ok.

I upload signed and unsigned transactions on pastebin.

Unsigned transaction: https://pastebin.com/XfE73U57

Decoded unsigned transaction: https://pastebin.com/RH2tNrNn

Signed transaction: https://pastebin.com/K15c29tK

Decoded signed transaction: https://pastebin.com/Mfs0bXgR

I check signatures and structure of transaction by hand, and they are all correct. Inputs are unspent. So what is the problem? Please help me.

  • when looking at blockchain.com/btc/tx/…, I can see that the transaction's input spent the funds already to other addresses. What do you get with listunspent? Commented Jul 22, 2018 at 8:46
  • pebwindkraft, I little bit confused about what are you asking for, because the 5 outputs of this transaction are "unspent"
    – chupacabra
    Commented Jul 22, 2018 at 10:52
  • I thought the error message indicates s.th. with the first transaction and it's input zero. Before going into further analysis of sig and scripts, I wanted to make sure, that this "outpoint 0" really contains funds. However, when I was looking at blockchain.info, I thought I can see, that the funds might have been sent already. So the output of "listunspent | grep -A9 -B1 $tx_id" would have helped to verify current status for the error message... If you like to, you can edit your original question and copy&paste output of the command, or use pastern again. Commented Jul 22, 2018 at 17:46
  • All inputs of my transaction are the unspend outputs from the one transaction c806c9ae2ac9c71fad307c9fedeca2133edb195cae9e924424885f57a63ba9a9. The outputs of this transaction are unspend (5 outputs). I try to edit my question so to clearify the problem that I really misunderstand.
    – chupacabra
    Commented Jul 23, 2018 at 11:37
  • @chupacabra something happened? similar error Commented Aug 14, 2018 at 17:38

2 Answers 2


Your transaction has 4 extra bytes at the end. Just remove the 01000000 and it should be fine then.


I think the unsigned raw transaction is not setup correctly. The unsigned tx has 5 times the pubkey script in the tx_in[0-4] section. It should have only one for each signature. How I understood the system, the way to go is to set all input scripts to nothing, and run through a loop for each of the five inputs, creating 5 separate signatures.

The first loop will have the pubkey script for tx_in[0]. All others remain empty. Then you calculate a valid signature for tx_in[0]. Then in the next loop you again set all to nothing, and only for tx_in1 the pubkey script. And so on... I try to display it this way:

set all scriptSig fields to empty, and length of field to 0
Loop 1
  only tx_in[0] with pubkey script, generate sig[0]
Loop 2
  only tx_in[1] with pubkey script, generate sig[1]
Loop 3
  only tx_in[2] with pubkey script, generate sig[2]
Loop 4
  only tx_in[3] with pubkey script, generate sig[3]
Loop 5
  only tx_in[4] with pubkey script, generate sig[4]

This will give you the signatures, now you place each signature in its scriptsig field, and adopt the length fields accordingly.

I have seen similiar info here and here.

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