NerveNetwork

# NRC20 token cross chain guide

# create NRC20 token

First, you need to create a cross chain token on the nuls main network, such as nrc20.

Cross chain nrc20 contract hex code:

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Create an nrc20 contract on the nuls wallet using the hex code above:

1 After the contract is published successfully, the token is created successfully. Next, you need to register the token as a cross chain asset.

# Register cross chain assets

After the cross chain token is released, enter the CLI command line of the main network, and query the asset ID of the token on the chain:

  • Command：getContractAsset <contractAddress>

    Parameter Explain
    contractAddress 跨链token合约地址
nuls>>> getContractAsset tNULSeBaN7eMT1PDG44vdGnL9uJkCsvTskBFW6
{
  "assetSymbol" : "TS",
  "assetId" : 13,
  "assetOwnerAddress" : "tNULSeBaN7eMT1PDG44vdGnL9uJkCsvTskBFW6",
  "assetName" : "test",
  "initNumber" : 10000000000000000,
  "assetType" : 2,
  "decimalPlace" : 8
}
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Next, you need to register token as cross chain asset on the main network:

  • Command：addcrosslocalasset <address><assetId>

    Parameter Explain
    <address> To register cross chain asset address, you need to import node wallet and the balance must be greater than 1000nuls
    <assetId> Nrc20 token's asset ID in the main network
nuls>>> addcrosslocalasset tNULSeBaMqpRQkHCs5ur3ck4LXEZB4qmmkPNo3 13
Please enter the password.
Enter your password:********
1416248734b0f218dbb7af1603276700d052713cc4f8cf8ca709f2fe75ebe98c
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Query the cross chain asset:

  • Command：crossassetinfo <chainId><assetId>

    Parameter Explain
    <chainId> Cross chain token chain ID (primary network: 1, test network: 2)
    <assetId> Token asset ID queried previously
nuls>>> crossassetinfo 2 13
{
  "chainId" : 2,
  "assetId" : 13,
  "symbol" : "TS",
  "assetName" : "test",
  "depositNuls" : "100000000000",
  "destroyNuls" : "20000000000",
  "initNumber" : "1000000000000000000000000",
  "decimalPlaces" : 8,
  "enable" : true,
  "createTime" : 1587524754,
  "address" : "tNULSeBaMqpRQkHCs5ur3ck4LXEZB4qmmkPNo3",
  "txHash" : "1416248734b0f218dbb7af1603276700d052713cc4f8cf8ca709f2fe75ebe98c"
}
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# token cross chain

# Main network to parallel chain

When a cross chain token crosses the chain from the main network to the parallel chain, the token contract provides a unique cross chain method (transfercrosschain):

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After the transaction is confirmed, query the asset through the parallel Chain Wallet:

  • Command：getbalance <address><chainId><assetId>

    Parameter Explain
    <address> Parallel link token address
    [chainId] Chain ID of token (default is the current chain ID)
    [assetId] token Asset ID（default is 1）
nuls>>> getbalance TNVTdN9i6eWsUxTTtC36JRqTAQit92vydnASG 2 13
{
  "available" : 1000000,
  "total" : 1000000,
  "freeze" : 0
}
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This completes the cross chain of nrc20 token from the main network to the parallel chain.

# Parallel chain to nuls main network / parallel chain

When the nrc20 cross chain token arrives at the parallel chain, it becomes a general cross chain asset. Then the cross chain transaction is initiated as follows:

  • Command：createcrosstx <formAddress><toAddress><chainId><assetId><amount>[remark]

    Parameter Explain
    <formAddress> Send out address, change address need to have a certain number of parallel chain assets and nuls as transaction initiation fee, cross chain token
    <toAddress> Main network / other parallel link receiving address
    <chainId> Chain ID of cross chain asset
    <assetId> Asset ID of cross chain asset
    <amount> Number of assets
    [remark] Remark
nerve>>> createcrosstx TNVTdN9i6eWsUxTTtC36JRqTAQit92vydnASG tNULSeBaMuU6sq72mptyghDXDWQXKJ5QUaWhGj 2 13 2000
Please enter the password.
Enter your password:**********
55ea878ef4e54af445c70ba121b8ef42593197e3f1b72b2eee039043b985bf15
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If the cross link address is accepted as the main network, it will be displayed as a contract asset in the wallet:

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If the receiving address is another parallel chain address, the query method is the same as that of the sending parallel chain (omitted).

# Attention

In the cross chain process, transactions need to be confirmed by multiple blocks, so it will take some time to query cross chain assets.

← How to register cross chain assets →