Documentation and confusion
**Describe the bug**

Everything runs smoothly except "eth_sendTransaction".

According to https://github.com/oliverw/miningcore/wiki/Coin-Daemon-&-Wallet-RPC#ethereum
you can run go-ethereum (geth) with:

$ geth --cache 1024 --mine --http --http.port 8545 --unlock <your-wallet-address> --password <password-file-path> --allow-insecure-unlock

Mining works fine. 
But after a mined block, I get an error when Miningcore should reward the miners on the pool.

Miningcore says "System.Exception: eth_sendTransaction returned error: invalid sender code -32000"
Geth says err="invalid sender"

I can transfere founds in the go-ethereum javasript console.

Have I forgot something here ?

**To Reproduce**
Steps to reproduce the behavior:
1. Setup go-ethereum according to documentation.
2. Setup Miningcore according to documentation.
3. Run mining on Miningcore.
4. Find a block.
5. No payment for miners due to error in configuration.

**Expected behavior**

Mining and payment should work by following instructions or manual.

**Screenshots**

I can provide screenshot If needed, or any other information.
Maybe this is something that others also run into,
and can be fixed by providing a little more information.

**Platform and software**
 - Ubuntu 22.04 LTS
 - Latest Miningcore.
 - Go-ethereum (geth) v1.20.1-beta (https://github.com/ethereumpow/go-ethereum/releases)

