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Helloworld


In this section, we will deploy and interact with a Hello World smart contract onto the Zilliqa testnet using Neo-Savant web IDE and ZilPay wallet.

Create Testnet Wallet using ZilPay

ZilPay is an open source browser add-on that manages a user’s Zilliqa wallet and can be used on Chrome, Firefox and Opera browsers. It does not store any user's private keys on the server. Instead, they are password protected and stored on browser storage. It is a non-custodial wallet, meaning, only the user has full access and responsibility for their private key.

To create a ZilPay wallet:

  1. Visit ZilPay's website and download the extension for your respective browser.
  2. Open the extension, create a new wallet by verifying your 12 words recovery phrase and selecting a password for your wallet. !!! note

       Please store your 12 words recovery phrase securely
    
  3. Click on the network change button (shown below) and select the network as testnet.

"Change Network Button"

Voila! You have now successfully set up a testnet ZilPay wallet.

Request Testnet $ZIL from Faucet

Deploying a contract to zilliqa's testnet will consume gas. As such you will need testnet $ZIL in your ZilPay account to pay for the gas.

To request for testnet $ZIL from the faucet,

  1. Visit Nucleus wallet testnet faucet
  2. Enter and submit your ZilPay address to the faucet, you will receive 300 testnet $ZIL shortly. This will take about 30s to 1 min, as the transactions will need to be confirmed on the blockchain.

"Nucleus Wallet Faucet"

Deploying Contract on Testnet

To deploy the Hello World contract on the Zilliqa testnet, we will use the Scilla web IDE, Neo-Savant IDE.

  1. Change the network to testnet and import your wallet by connecting with Zilpay.

"IDE Step1"

  1. Select the Hello World contract under the files tab and click on Check button to use the typechecker to check for any syntax errors in your contract.

"IDE Step2"

  1. Once the typechecker result is passed, click on Deploy button to deploy the contract to testnet. Use your wallet address (Base16 format) for the "owner" initialisation parameter.

"IDE Step3"

Yay! Your contract is now deployed on the testnet and can be accessed under the "Contracts" tab on the left side of the IDE.

Tip

To convert from Bech32 address format into base16 address format, you can use the address converter in the IDE. Click on Tools > Address converter.

Understanding the Hello World Contract

The Hello World contract written in the scilla smart contract programming language essentially consists of two transitions. The transitions of a scilla contract define the public interface for the contract and are a way to define how the state of the contract may change.
The two transitions in the Hello World are:

  1. setHello() - setHello transition updates the value of the mutable variable - 'welcomeMsg' to the value of the transition parameter.