SMART_CONTRACT.md

Smart Contract Deployment Guide

1. Generating Smart Contract ABI

   1. Open the contract.sol file with the Solidity Online Compiler Remix

   2. Select the 'Solidity Compiler' menu on the left pane of the online compiler.

   3. Select Compiler Version to be 0.4.11 and click on the 'Compile contract.sol' button.

   4. Now, copy the contract ABI generated, provided at the bottom right of the left pane.

   5. This ABI has to be inserted in place of the var abi in the smart contract section of producer.js and consumer.js.

2. Deploying the Smart Contract to your private network

   (Complete the steps mentioned in INSTALL.md before implementing this section.)

   1. Open the ethereum private console and unlock your first account with starting balance allocated through genesis.json.

      $ ./Geth/geth --rpc --rpcapi="eth,web3,miner,net,personal" --rpcaddr="localhost" --rpcport="8545" --rpccorsdomain="*" console
      > personal.unlockAccount(eth.accounts[0])
      [output] Unlock account 0x........................................
      [output] Passphrase: Enter your account passphrase here
      [output] true

   2. Select the 'Deploy & run transactions' menu on the left pane of the online compiler.

   3. Select the Environment to be Web3 Provider and click Ok on the pop-up window. (Make sure the geth node is running and account is unlocked.)

   4. Select the account you unlocked in step 1 from the ACCOUNT drop down menu.

   5. Click on Deploy

   6. You will see something like the following on your geth console:

      > I0812 18:03:26.415128 internal/ethapi/api.go:1074] Tx(0x........................................) created: 0x........................................

   7. Copy the hex value after the string 'created:' from the output on your geth console. This is the hex address of the deployed contract.

   8. This address has to be inserted in place of the var contract_address = "0x....." and var obj = web3.eth.contract(abi).at("0x....") in the smart contract section of producer.js and consumer.js.

   9. Now start mining to mine the smart contract creation block. You will immediately see the block with transaction id of your contract being mined and added to your private chain.

      > miner.start()

   10. Stop Mining

       > miner.stop()