<p>Hard to say without looking at the code. Want to paste the relevant code?</p>

<p>When dealing with the GreenAddress api we generally sign using libsecp256k1 rather than pycoin (even when we use pycoin for other things)</p>

<p>For example see <a href="https://github.com/greenaddress/garecovery" rel="nofollow noreferrer">https://github.com/greenaddress/garecovery</a> - it makes GA multisig transactions with pycoin and then signs them</p>

<p>Hope it helps!</p>

CC BY-SA 3.0
2018-03-18T11:33:58.187Z
I appreciated your help. This answer is great helpful to me.
Coder HHC
CC BY-SA 3.0
2018-03-18T17:18:09.927Z
Hi, Lawrence Nahum. I saw the project you teached me. There is also one problem. Sorry. From unspent transactions, How to make transaction and sign it? Pls help me.
Coder HHC
CC BY-SA 3.0
2018-03-18T10:32:28.223Z
2018-03-18T10:32:28.223Z
Lawrence Nahum
<p>There is a problem in making and sending transaction.
I got UTXOS by using <strong>API</strong>(<code>GreenAddress</code>), and from utxos I made a transaction. But calculated fee is always larger than one in original GA service.
Sometimes success to send transaction.
Sometimes, receives error like this <code>'Invalid signature'</code>.
I can't find out reason.
Help me.</p>

<transactions><transaction-fees><python><green-address><pycoin>
Pycoin: How to send transaction?
Coder HHC
# Pycoin: How to send transaction?

(Asked by: username_0 on 2018-03-16)

There is a problem in making and sending transaction.
I got UTXOS by using **API**(`GreenAddress`), and from utxos I made a transaction. But calculated fee is always larger than one in original GA service.
Sometimes success to send transaction.
Sometimes, receives error like this `'Invalid signature'`.
I can't find out reason.
Help me.

**Tags:** transactions, transaction-fees, python, green-address, pycoin


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## 1 answers

### Answer by username_1 on 2018-03-18. Score: 0 | Accepted answer

Hard to say without looking at the code. Want to paste the relevant code?

When dealing with the GreenAddress api we generally sign using libsecp256k1 rather than pycoin (even when we use pycoin for other things)

For example see <https://github.com/greenaddress/garecovery> - it makes GA multisig transactions with pycoin and then signs them

Hope it helps!

> **Comments:**
> **username_0**: I appreciated your help. This answer is great helpful to me.  
> **username_0**: Hi, username_1. I saw the project you teached me. There is also one problem. Sorry. From unspent transactions, How to make transaction and sign it? Pls help me.  

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