🕹️Deploy WASM Smart Contract

How to deploy WASM binary file on Titan Chain

Note: This process require some advanced knowledge. This tutorial focuses on smart contract deployment using command line tool. You can explore other methods by yourself.

Step 1: Prepare the WASM contract file

• Compile your WASM contract, and generate the binary with name <project_name>.wasm

Step 2: Upload the WASM file to Titan Chain

• Execute the upload command:

titand tx wasm store <project_name>.wasm --from <account> --gas 10000000 --gas-prices 0.0025uttnt

<account> is your account name. Please replace it with your actual account name.

• Check if the transaction is on chain and get the code id:

titand query tx <tx_hash>

<tx_hash> is the transaction hash generated from your upload, used for query the transaction status.

• Or get the code id using the following command:

titand query wasm list-code

Using list-code command, you can view all uploaded contracts and their code id.

Step 3: Instantiate the WASM contract

• Instantiate the contract:

titand tx wasm instantiate <code_id> <json_encoded_init_args> --admin="$(titand keys show <account> -a)" --from <account> --gas 10000000 --gas-prices 0.0025uttnt --label <label>

<code_id> is the code id you get in Step 2

<json_encoded_init_args>is the parameter required for contract initiation, which should be coded in JSON format.

<label> is the contract label

• Check if the transaction is on chain and get the contract address:

titand query tx <tx_hash>

If successful, you can get the contract address for further operations.

Step 4: Query the contract state

• Using the command to query cantract state:

titand query wasm contract-state smart <contract_address> <query_args>

<contract_address> is the contract address you get in Step 3.

<query_args> is the required parameter for the query, which should be coded in JSON format.

• View contract state using Titan blockchain browser:

  • You can also use Titan blockchain browser to view your contract status: Titan Blockchain Browser
  • Key in the contract address in the browser and you can see the details and state of your contract.

Step 5: Execute the contract

• Execute the contract call:

titand tx wasm execute <contract_address> <exec_args> --fees 500uttnt --from <account>

<exec_args> is the required parameter for contract execution, which should be coded in JSON format.

Hints:

• <...> in every step should be replaced by your actual value

• Check the parameters in the command carefully before execute each step to ensure correct deployment and operation of the contract.