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Create a privacy-enabled network

This tutorial shows you how to create a privacy-enabled network. The network uses Tessera, a private transaction manager, to encrypt and distribute private transactions.

warning

The steps in this tutorial create an isolated, but not protected or secure, Ethereum private network. We recommend running the private network behind a properly configured firewall.

Prerequisites​

Steps​

Listed on the right-hand side of the page are the steps to create a private network using IBFT with 5 GoQuorum nodes and 2 Tessera nodes.

1. Create directories​

Create directories for the 2 Tessera nodes in the IBFT-Network directory previously created.

IBFT-Network/
├── Node-0
│   ├── data
├── Node-1
│   ├── data
├── Node-2
│   ├── data
├── Node-3
│   ├── data
├── Node-4
│   ├── data
├── Tessera-0
├── Tessera-1

2. Generate Tessera keys​

In the Tessera-0 directory, generate keys. Replace <path-to-tessera> with the path to Tessera.

java -jar /<path-to-tessera>/tessera.jar -keygen -filename tessera0

Press enter both times you are prompted for a password.

The private and public key are created in files called tessera0.key and tessera0.pub.

warning

In a production environment, ensure keys are secured appropriately.

3. Create configuration file​

In the Tessera-0 directory, create a configuration file called config.json. Copy and paste the the configuration below into the file. On the highlighted lines, replace <path to IBFT-network> with the path to your network.

{
  "useWhiteList": false,
  "jdbc": {
    "username": "sa",
    "password": "",
    "url": "jdbc:h2:/<path to IBFT-network>/IBFT-network/Tessera-0/db1;MODE=Oracle;TRACE_LEVEL_SYSTEM_OUT=0",
    "autoCreateTables": true
  },
  "serverConfigs": [
    {
      "app": "ThirdParty",
      "enabled": true,
      "serverAddress": "http://localhost:9081",
      "communicationType": "REST"
    },
    {
      "app": "Q2T",
      "enabled": true,
      "serverAddress": "unix:/<path to IBFT-network>/IBFT-network/Tessera-0/tm.ipc",
      "communicationType": "REST"
    },
    {
      "app": "P2P",
      "enabled": true,
      "serverAddress": "http://localhost:9001",
      "sslConfig": {
        "tls": "OFF"
      },
      "communicationType": "REST"
    }
  ],
  "peer": [
    {
      "url": "http://localhost:9001"
    },
    {
      "url": "http://localhost:9003"
    }
  ],
  "keys": {
    "passwords": [],
    "keyData": [
      {
        "privateKeyPath": "<path to IBFT-network>/IBFT-network/Tessera-0/tessera0.key",
        "publicKeyPath": "<path to IBFT-network>/IBFT-network/Tessera-0/tessera0.pub"
      }
    ]
  },
  "alwaysSendTo": []
}

4. Create Tessera-1 keys​

In Tessera-1, generate keys in the same way as for Tessera-0. Replace <path-to-tessera> with the path to Tessera.

java -jar /<path-to-tessera>/tessera.jar -keygen -filename tessera1

5. Create Tessera-1 configuration file​

In the Tessera-1 directory, create a configuration file called config.json. Copy and paste the the configuration below into the file. Different ports are specified for Tessera 1. On the highlighted lines, replace <path to IBFT-network> with the path to your network.

{
  "useWhiteList": false,
  "jdbc": {
    "username": "sa",
    "password": "",
    "url": "jdbc:h2:/<path to IBFT-network>/IBFT-network/Tessera-1/db1;MODE=Oracle;TRACE_LEVEL_SYSTEM_OUT=0",
    "autoCreateTables": true
  },
  "serverConfigs": [
    {
      "app": "ThirdParty",
      "enabled": true,
      "serverAddress": "http://localhost:9083",
      "communicationType": "REST"
    },
    {
      "app": "Q2T",
      "enabled": true,
      "serverAddress": "unix:/<path to IBFT-network>/IBFT-network/Tessera-1/tm.ipc",
      "communicationType": "REST"
    },
    {
      "app": "P2P",
      "enabled": true,
      "serverAddress": "http://localhost:9003",
      "sslConfig": {
        "tls": "OFF"
      },
      "communicationType": "REST"
    }
  ],
  "peer": [
    {
      "url": "http://localhost:9001"
    },
    {
      "url": "http://localhost:9003"
    }
  ],
  "keys": {
    "passwords": [],
    "keyData": [
      {
        "privateKeyPath": "<path to IBFT-network>/IBFT-network/Tessera-1/tessera1.key",
        "publicKeyPath": "<path to IBFT-network>/IBFT-network/Tessera-1/tessera1.pub"
      }
    ]
  },
  "alwaysSendTo": []
}

6. Start Tessera 0​

In the Tessera-0 directory, start Tessera 0. Replace <path to tessera> with the path to Tessera.

java -jar <path to Tessera>/tessera.jar -configfile config.json

7. Start Tessera 1​

In the Tessera-1 directory, start Tessera 1. Replace <path to tessera> with the path to Tessera.

java -jar <path to Tessera>/tessera.jar -configfile config.json

8. Start GoQuorum node 0​

In the Node-0 directory, start GoQuorum node 0 specifying the Tessera 0 node to attach to. Replace <path to IBFT network> with the path to your network.

PRIVATE_CONFIG=/<path to IBFT network>/IBFT-network/Tessera-0/tm.ipc geth --datadir data --nodiscover --istanbul.blockperiod 5 --syncmode full --mine --minerthreads 1 --verbosity 5 --networkid 10 --http --http.addr 127.0.0.1 --http.port 22000 --http.api admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,istanbul --emitcheckpoints --port 30300 --allow-insecure-unlock
caution

The --allow-insecure-unlock option enables insecure account unlocking for educational purposes only. In production environments, ensure account keys are secured appropriately.

9. Start GoQuorum node 1​

In the Node-1 directory, start GoQuorum node 1 specifying the Tessera 1 node to attach to. Replace <path to IBFT network> with the path to your network.

PRIVATE_CONFIG=/<path to IBFT network>/IBFT-network/Tessera-1/tm.ipc geth --datadir data --nodiscover --istanbul.blockperiod 5 --syncmode full --mine --minerthreads 1 --verbosity 5 --networkid 10 --http --http.addr 127.0.0.1 --http.port 22001 --http.api admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,istanbul --emitcheckpoints --port 30301

10. Start nodes 2, 3, and 4​

In new terminal for each node in each node directory, start the remaining nodes using the same command as in the IBFT tutorial. Nodes 2, 3, and 4 do not have an attached Tessera node.

PRIVATE_CONFIG=ignore \
geth --datadir data --nodiscover --istanbul.blockperiod 5 --syncmode full --mine --minerthreads 1 --verbosity 5 --networkid 10 --http --http.addr 127.0.0.1 --http.port 22002 --http.api admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,istanbul --emitcheckpoints --port 30302

Your node can now send and receive private transactions.