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CW20.md

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This steps are based on https://docs.junonetwork.io/smart-contracts-and-junod-development/tumerlinal-erc-20

  1. Compile wasm

Clone erc20 contract in RUST and compile it. The result is .wasm file. Take an example of erc20 contract from here - https://github.com/InterWasm/cw-contracts/tree/main/contracts/erc20

  1. Upload wasm

Upload compile wasm contract to the chain.

merlind tx wasm store cw_erc20.wasm --from validator --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ -y

This command will return a code number which starts from 1.

  1. instantiate

Create a contract from uploaded wasm. This will use the code number generated at upload step.

merlind tx wasm instantiate 1 'instantiate message' --amount 50000umerlin --label "merlin erc20" --from validator --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ --no-admin -y

merlind tx wasm instantiate 1 '{"name":"Nxtpop Coin","symbol":"NPOP","decimals":6,"initial_balances":[{"address":"pop1...","amount":"12345678000"}]}' --amount 50000umerlin --label "merlin erc20" --from validator --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ --no-admin -y

This command will return a contract address.

  1. query contract

Query contract info by address. Use above generated contract address to check contract info.

merlind query wasm contract "contract address"

merlind query wasm contract pop1.....
  1. query balance

Query balance of an address. At first, try to check the address with initial balances.

merlind query wasm contract-state smart "contract address" '{"balance":{"address":"user address"}}'

merlind query wasm contract-state smart pop1... '{"balance":{"address":"pop1..."}}'
  1. transfer cw20 token

Transfer cw20 token to an address.

merlind tx wasm execute "contract address" 'transfer message' --from initial --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ -y

merlind tx wasm execute "contract address" '{"transfer":{"amount":"amount","owner":"from address","recipient":"receiver address"}}' --from initial --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ -y

merlind tx wasm execute pop1... '{"transfer":{"amount":"200","owner":"pop1...","recipient":"pop1..."}}' --from initial --chain-id testing --gas auto --gas-adjustment 1.3 -b block --keyring-backend=test --home=$HOME/.merlind/ -y

Try to test balance changes after transfer using merlind query wasm contract-state smart command in step 5.