eHMND to HMND
The guide to swap eHMND to HMND.
Tools
Environment to deploy ethereum smart contracts like Remix IDE
Ethereum supported wallet like Metamask
Steps
Open the Remix IDE and create a file containing the currency swap precompile interface.
// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Currency Swap Interface
*
* An interface enabling swapping the funds from EVM accounts to
* native Substrate accounts.
*
* Address: 0x0000000000000000000000000000000000000900
*/
interface CurrencySwap {
/**
* Transfer the funds from an EVM account to native substrate account.
* Selector: 76467cbd
*
* @param nativeAddress The native address to send the funds to.
* @return success Whether or not the swap was successful.
*/
function swap(bytes32 nativeAddress) external payable returns (bool success);
}

Go to
compile
tab and compile the interface.Go to deploy tab.
Properly select
ENVIRONMENT
,ACCOUNT
andCONTRACT
fields.Use
0x0000000000000000000000000000000000000900
value as an input forDeploy
tab atAt Address
field.Click on
Deploy
tab and openDeployed Contracts
tab. You will be able to see aswap
call. The call acceptsbytes32
nativeAddress
as an argument to send currency to.Open
Utilities
tab at Polkadot-JS apps connected to Humanode Israfel Testnet.Convert your native HMND address into
bytes32
value.Copy the value from the
hex public key
field and go back to Remix IDE. Input the value as an argument for theswap
call. Input the amount you would like to swap intoVALUE
field. Keep in mind, that you should input the amount with 18 point decimals value in case usingWei
.Finally, perform the swap by clicking on the
swap
call and confirm the transaction.Check the balance on the Polkadot-JS app.
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