Private Blockchain – How to Deploy Smart Contract to a Predefined Address

contract-deploymentprivate-blockchain

Is there any method to deploy our smart contract in a particular address (ie. predefined contract address) in private ethereum network?

Yes, I have built my own private blockchain based on Ethereum code. I need to deploy contract on some blocks and I have to send that address to my client ( users). In this scenario, I don't want to send a different address to the client while I am deploying a contract. If it was a static address it will be easy for me. I will just inform them I have deployed a new contract so that they can use the static address to get input for their code.

Best Answer

It is not possible to deploy a contract to an address of your choice

The address a contract is deployed to is generated deterministically using the address of the deployer and the deployer's total number of transactions (the nonce): How is the address of an Ethereum contract computed?

This means you can work out the address of the contract before it is deployed:

var ethJsUtil = require('ethereumjs-util');
var futureAddress = ethJsUtil.bufferToHex(ethJsUtil.generateAddress(
  yourAddress,
  web3.eth.getTransactionCount(yourAddress)));

(from https://stackoverflow.com/a/42416934)

Related Solutions

Parity Private Network – Adding Private Network Peers to Parity

Not sure if I get your question correctly. Assuming you have a private network running with 5 clients on network ID 13337 and myGenesis.json chain configuration.

enode://0000..0001@192.168.178.101:36541
enode://0000..0002@192.168.178.102:36542
enode://0000..0003@192.168.178.103:36543
enode://0000..0004@192.168.178.104:36544
enode://0000..0005@192.168.178.105:36545

Add these nodes to a file, let's say myPrivateNetwork.txt, one entry per line:

enode://0000..0001@192.168.178.101:36541
enode://0000..0002@192.168.178.102:36542
enode://0000..0003@192.168.178.103:36543
enode://0000..0004@192.168.178.104:36544
enode://0000..0005@192.168.178.105:36545

And subsequently, run Parity with --chain myGenesis.json --network-id 13337 --reserved-peers myPrivateNetwork.txt --reserved-only. Or add it to the config file:

[parity]
chain = "myGenesis.json"

[network]
id = 13337
reserved_only = true
reserved_peers = "./myPrivateNetwork.txt"

This will establish a private network containing only your nodes:

--reserved-peers FILE        Provide a file containing enodes, one per line.
                             These nodes will always have a reserved slot on top
                             of the normal maximum peers. (default: None)
--reserved-only              Connect only to reserved nodes. (default: false)

Adding reserved peers also works from the Web3 console by issuing:

api.parity.addReservedPeer('enode://0000..0007@192.168.178.107:36547')

Note, that you have to enable the parity json rpc api.

You can also run a private development chain with parity --chain dev.

Private Blockchain – How to Bridge Public and Private Blockchains or Smart Contracts

As blockchain networks only take into consideration what is happening in the chain, probably you should connect your private network to your erc20 tokens through oracles. Therefore, depending on what is going on with your smart contracts you can trigger actions on your private network or the oposite.

Following this link you can test how to build an oracle, it is quite straight forward:

https://medium.com/@mustwin/building-an-oracle-for-an-ethereum-contract-6096d3e39551

But also you could use the service oraclize

http://www.oraclize.it

Best Answer

Related Solutions

Parity Private Network – Adding Private Network Peers to Parity

Private Blockchain – How to Bridge Public and Private Blockchains or Smart Contracts

Related Topic