# NRC20 token跨链指南
# 创建跨链token
首先需要在NULS主网上面创建可跨链的token，比如可跨链的NRC20 token。
可跨链NRC20 token合约HEX码：
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在NULS轻钱包上使用上面的HEX码创建一个NRC20 token合约：
合约发布成功之后，token创建成功，接下来需要把token注册为跨链资产。
# 注册跨链资产
跨链token发布之后，进入主网CLI命令行，查询该token在链上的资产ID：
命令：getContractAsset <contractAddress>
参数 说明 contractAddress 跨链token合约地址
nuls>>> getContractAsset tNULSeBaN1ZqpJMewjrZWPh7sFXq7KzgbJxBxW
{
"assetSymbol" : "TEST",
"assetId" : 56,
"assetOwnerAddress" : "tNULSeBaN1ZqpJMewjrZWPh7sFXq7KzgbJxBxW",
"assetName" : "test",
"initNumber" : 10000000000000000,
"assetType" : 2,
"decimalPlace" : 8
}
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接下来就需要在主网上把token注册为跨链资产：
命令：addcrosslocalasset <address><assetId>
参数 说明 <address> 注册跨链资产地址，需要导入节点钱包且余额足够支付交易手续费 <assetId> NRC20 token在主网的资产ID
nuls>>> addcrosslocalasset tNULSeBaMqpRQkHCs5ur3ck4LXEZB4qmmkPNo3 56
Please enter the password.
Enter your password:********
6d7c81a251c2dd55b90a859412e069c4bd58eaa43ed3f5d0f46ceefde879fe29
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查询一下该跨链资产：
命令：crossassetinfo <chainId><assetId>
参数 说明 <chainId> 跨链token链ID（主网：1，测试网：2） <assetId> 前面查询的token资产ID
nuls>>> crossassetinfo 2 56
{
"chainId" : 2,
"assetId" : 56,
"symbol" : "TEST",
"assetName" : "test",
"depositNuls" : "100000000000",
"destroyNuls" : "20000000000",
"initNumber" : "10000000000000000000",
"decimalPlaces" : 8,
"enable" : true,
"createTime" : 1599198332,
"address" : "tNULSeBaMqpRQkHCs5ur3ck4LXEZB4qmmkPNo3",
"txHash" : "5bbc2a038586151a6b9c5afeefb546ecd5481e25741b97f07c3d0fb30382eb6a"
}
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# token跨链
# 主网到平行链
NRC20 token从主网到平行链进行跨链时，直接在NULS网页钱包转账页面进行转账，收款地址填平行链接收地址，资产类型选择跨链Token
交易确认之后，通过平行链钱包查询该资产：
命令：getbalance <address><chainId><assetId>
参数 说明 <address> 平行链接收token地址 [chainId] token的链ID（默认为本链ID） [assetId] token的资产ID（默认1）
nuls>>> getbalance TNVTdTSPTXQudD2FBSefpQRkXTyhhtSjyEVAF 2 56
{
"available" : 1000000,
"total" : 1000000,
"freeze" : 0
}
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或者直接在网页钱包中查看跨链过来的资产：
这就完成了NRC20 token从主网到平行链的跨链。
# 平行链到NULS主网/平行链
当NRC20 token跨链到了平行链之后，就变成了一般的跨链资产，那么发起跨链交易如下：
命令：createcrosstx <formAddress><toAddress><chainId><assetId><amount>[remark]
参数 说明 <formAddress> 发出地址，改地址需要拥有一定数量平行链资产和NULS作为交易发起手续费，跨链token <toAddress> 主网/其他平行链接收地址 <chainId> 跨链资产链ID <assetId> 跨链资产资产ID <amount> 资产数量 [remark] 备注
nerve>>> createcrosstx TNVTdTSPTXQudD2FBSefpQRkXTyhhtSjyEVAF tNULSeBaMuU6sq72mptyghDXDWQXKJ5QUaWhGj 2 56 2000
Please enter the password.
Enter your password:**********
55ea878ef4e54af445c70ba121b8ef42593197e3f1b72b2eee039043b985bf15
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如果接受跨链地址为主网，则在钱包显示为合约资产：
如果接收地址为其他平行链地址，则查询方式与发出平行链一致（略）。
# 注意
跨链过程中交易需要经过多个区块的确认，所以需要等一定时间才能查询到跨链资产。
# 在NerveDEX上创建NRC20 token交易对
首先，进入NerveDEX (opens new window)，选择目录中工具下面的NervePad点击进入：
进入NervePad之后，选择创建交易对页签，进入交易对创建页面，并且选择NRC20token为交易资产，完善其他信息发起创建交易对交易（创建交易对的地址需要拥有大于200NVT资产）：
交易对创建成功之后，进入交易中心的OpenList可以查看创建成功的交易对：
至此，我们成功的创建了交易对，开始交易吧！