交易所钱包开发 8个步骤成功轻松完成usdt离线签名交易

8月 13, 2021

对于加密货币玩家来说，想要在交易平台进行币币交易，首先需要在场外购入加密货币USDT，然后再用USDT购买其币种，像BTC、ETH、BCH等等。

这是由于近几年来加密货币市场虽然一片繁荣，但各地政府监管的不明朗，致使加密交易所难以得到银行的的支持，在法币与加密货币的连接之间形成了一大难题，USDT由此诞生。 USDT 是Tether公司基于稳定价值货币美元（USD）发行的代币,它的价格稳定、高透明度、最低交易费用使它成为加密市场中使用最多、应用最广泛的稳定币，几乎全球主流交易所都有 USDT 的交易对，可见 USDT 的共识还是最大。

如何存储usdt比较安全？

大额或长期的话，可以采用加密备份的冷钱包和离线签名的方式。加密是为了以防暴露，备份是为了以防丢失，离线是为了抵御黑客攻击。在物理层有着这样的一条反黑策略，大致意思是我偏不联网，看你怎么黑我，我用骰子生成私钥，看你怎么碰撞。虽然用离线签名的方式使用冷钱包的存款，有点麻烦，但相对安全。

交易所企业如何进行余额归集更加安全方便？

优盾钱包以安全完善的技术重新定义数字资产钱包，为btc、eth、usdt等100多种币种提供API接入；顶级私钥BOSS自主掌握，子私钥动态计算不触网，硬件加持，纯冷操作；多级财务审核策略，资产动向、操作日志一目了然；海量地址统一管理，余额一键自动归集。

如何进行usdt离线签名交易？

第一步：查询未花费交易

参数：最小确认区块数、最大确认区块数、钱包地址数组

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "listunspent" 0 999999 '["mu5vgTeuMRbGDAYZuvnYcebuky7bte2XNr",

返回结果：

第二步：构建payload
参数：propertyid、交易的usdt数量

返回结果：

第三步：创建未签名交易

参数：第一步的input集合(即一个或多个输入) {转出地址:0.00000546}

这0.00000546个btc其实是btc交易的最小交易数。btc交易中附带的数据可以认为是USDT交易的本质，没有btc，usdt就没有输入就不能转出。

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "createrawtransaction" '[{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":2},{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":0}]' '{"mq8FvvycAHw8zzwarYbk8SQ8uTY3GN493u":0.00000546}'

返回结果：

第四步：给交易载入payload

参数：第三步结果、第二步结果

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "omni_createrawtx_opreturn" "01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff0122020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac00000000" "0000000000000001000000000d3ed6b0"

返回结果：

01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff0222020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b000000000

第五步：设置收款地址

参数：第四步结果、收款钱包地址

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "omni_createrawtx_reference" "01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff0222020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b000000000" "mtsZjfgk6mb2wKqzt76rsybANpys25dcmi"

返回结果：

01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff0322020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b022020000000000001976a914927f8a23044bf2f4d2231ec0d40c844da44216fe88ac00000000

第六步：设定找零和手续费

此步骤的找零和手续费指的是btc。

参数：第5步结果、第一步的输入列表（json格式，值得一提的是amount要改成value）、btc找零地址（能够设定为第一步中的地址）、交易手续费（设置值太低可能会被认为是尘埃交易导致丢弃）

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "omni_createrawtx_change" "01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff0322020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b022020000000000001976a914927f8a23044bf2f4d2231ec0d40c844da44216fe88ac00000000" '[{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":2,"scriptPubKey":"76a9146966699024c310c454049a6eaac9c58fee02081c88ac","value":0.00000546},{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":0,"scriptPubKey":"76a9141f00be4aee1d4534870b65c9b6c2e5276ffff0c888ac","value":19.99960000}]' "miLt8eZ85Z4S4sDXAVbK2R1E49RgnRasgK" 0.0004

返回结果：

01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff045e593477000000001976a9141f00be4aee1d4534870b65c9b6c2e5276ffff0c888ac22020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b022020000000000001976a914927f8a23044bf2f4d2231ec0d40c844da44216fe88ac00000000

第七步：签名交易

最后两步能够直接用btc的命令，但即使是最新版的omnicored程序都是基于老版本的bitcoind（0.13.2），所以无法使用signrawtransactionwithkey方法，只能使用旧版的signrawtransaction方法

参数：第六步结果、输入列表、以及输入列表中地址对应的私钥

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "signrawtransaction" "01000000022db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0200000000ffffffff2db78a7a1bf8a7b21fbf2a3f0557c96029095cd8d2efbdb53b11c368c214867a0000000000ffffffff045e593477000000001976a9141f00be4aee1d4534870b65c9b6c2e5276ffff0c888ac22020000000000001976a9146966699024c310c454049a6eaac9c58fee02081c88ac0000000000000000166a146f6d6e690000000000000001000000000d3ed6b022020000000000001976a914927f8a23044bf2f4d2231ec0d40c844da44216fe88ac00000000" '[{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":2,"scriptPubKey":"76a9146966699024c310c454049a6eaac9c58fee02081c88ac","value":0.00000546},{"txid":"7a8614c268c3113bb5bdefd2d85c092960c957053f2abf1fb2a7f81b7a8ab72d","vout":0,"scriptPubKey":"76a9141f00be4aee1d4534870b65c9b6c2e5276ffff0c888ac","value":19.99960000}]' '["92a4LrHSVUqvFSn6fxQKgoEL6wRJjkYy54vqNXVe5tRupQusmHZ","93QsgtSBGBih7bGYCPvkuig9wKaMDpQXLsVYCWnD6aLovP2yXLn"]'

返回结果：

{
"hex": "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",
"complete": true
}

第八步：广播交易

参数：第七步结果的哈希值

omnicore-cli -conf=/root/.omnicore/bitcoin.conf "sendrawtransaction" "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"

返回结果：

5c67fc9eb0cdce9af1aa4f4a9f134b1fa98bed68f03a186b2b7065227576afe3

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