AVAX 接入

对AVAX币做交易扫描，生成unsignedTx，本地签名，发布到AVAX节点上

AVAX文档及介绍

AVAX有三条链，交易链(X-Chain)，平台链(P-Chain)，合约链(C-chain)；
AVAX币交易主要在X-Chain上面

文档连接:
https://docs.avax.network/

fuji文档:
https://docs.avax.network/build/tutorials/platform/fuji-workflow

avalanche sdk：
https://github.com/ava-labs/avalanchejs

测试环境：

交易记录： https://explorer.avax-test.network/
扫描区块API： https://docs.avax.network/build/tools/ortelius#list-transactions
申请测试币：https://faucet.avax-test.network/

// 构建交易
const avalanche = require("avalanche");
const { BinTools, Buffer, BN } = require("avalanche");


/**
 * 生成unsignedTx，发布signedTx
 */ 
const transfer = async() => {

    const avax = new avalanche.Avalanche("api.avax-test.network", "443", "https", 5);
    const xchain = avax.XChain();

    const fromAddress = "X-fuji1545wjzj259cznytgxcu0tvyfcte4j6h80pn8vs";
    const toAddress = "X-fuji1sfxeh8zqnylj3gsvsq2xajz2xg6kzr03p7a3gk";

    const sendAmount = new BN(500);
    const memo = Buffer.from(
        "AVM method buildBaseTx, echo Response"
    )
    const asOf =  new BN(Math.round(new Date().getTime() / 1000));
    const locktime = new BN(0);
    const threshold = 1;
    const assetid = "U8iRqJoiJm8xZHAacmvYyZVwqQx6uDNtQeP3CQ6fcgQk3JqnK";
    const u = await xchain.getUTXOs(fromAddress);
    const utxos = u.utxos;

    const unsignedTx = await xchain.buildBaseTx(
        utxos,
        sendAmount,
        assetid,
        [toAddress],
        [fromAddress],
        [fromAddress],
        // 下面这些可以不传
        memo,
        asOf,
        locktime,
        threshold,
    );

    let data = await sign(unsignedTx.serialize());
    data = JSON.parse(JSON.stringify(data));

    let signedTx = new avalanche.avm.Tx();
    signedTx.deserialize(data);

    const txid = await xchain.issueTx(signedTx)
    console.log(`txid:${txid}`);
}

/**
 * 签名认证
 */
const sign = async(unsignedTx) => {
    const avax = new avalanche.Avalanche();
    const xchain = avax.XChain();
    const xKeyChain = xchain.keyChain();

    // fromAddress privateKey
    priKeyHexStr = "859a9f0393582307642b1d81b1be3426975de8258679a021af97e155bc159e99387dbb78b41e86aa6ca345983a2e80ad89f37782ef6552becaf92ca874863d98"
    let buf = Buffer.from(priKeyHexStr, 'hex');
    xKeyChain.importKey(new Uint8Array(buf));

    // 模拟网络传输，序列化和反序列化
    unsignedTx = JSON.parse(JSON.stringify(unsignedTx))
    let un = new avalanche.avm.UnsignedTx();
    un.deserialize(unsignedTx)

    const signedTx = xchain.signTx(un);
    return signedTx.serialize();
}