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Updated testnet documentation

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TestNets.md
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- Start up at least as many nodes as `minBlockchainPeers` (or adjust this value instead)
- Probably best to perform API call `DELETE /peers/known`
- Add other nodes via API call `POST /peers <peer-hostname-or-IP>`
- Add minting private key to node(s) via API call `POST /admin/mintingaccounts <minting-private-key>`
This key must have corresponding `REWARD_SHARE` transaction in testnet genesis block
- Add minting private key to nodes via API call `POST /admin/mintingaccounts <minting-private-key>`
The keys must have corresponding `REWARD_SHARE` transactions in testnet genesis block
- You must have at least 2 separate minting keys and two separate nodes. Assign one minting key to each node.
- Alternatively, comment out the `if (mintedLastBlock) { }` conditional in BlockMinter.java to allow for a single node and key.
- Wait for genesis block timestamp to pass
- A node should mint block 2 approximately 60 seconds after genesis block timestamp
- Other testnet nodes will sync *as long as there is at least `minBlockchainPeers` peers with an "up-to-date" chain`
- You can also use API call `POST /admin/forcesync <connected-peer-IP-and-port>` on stuck nodes
## Single-node testnet
A single-node testnet is possible with code modifications, for basic testing, or to more easily start a new testnet.
To do so, follow these steps:
- Comment out the `if (mintedLastBlock) { }` conditional in BlockMinter.java
- Comment out the `minBlockchainPeers` validation in Settings.validate()
- Set `minBlockchainPeers` to 0 in settings.json
- Set `Synchronizer.RECOVERY_MODE_TIMEOUT` to `0`
- All other steps should remain the same. Only a single reward share key is needed.
- Remember to put these values back after introducing other nodes
## Fixed network
To restrict a testnet to a set of private nodes, you can use the "fixed network" feature.
This ensures that the testnet nodes only communicate with each other and not other known peers.
To do this, add the following setting to each testnet node, substituting the IP addresses:
```
"fixedNetwork": [
"192.168.0.101:62392",
"192.168.0.102:62392",
"192.168.0.103:62392"
]
```
## Dealing with stuck chain
Maybe your nodes have been offline and no-one has minted a recent testnet block.