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我试图使用 blockcypher 和这里描述的 bitcoinjs lib 签署比特币测试网交易，但我遇到了这个错误，我不知道我做错了什么。

{"error": "Couldn't deserialize request: invalid character 'x' in literal true (expecting 'r')"}

在四处搜索时，我找不到问题的解决方案，我联系了 blockcypher，但他们从未回应。这是我用来签署交易的代码，有谁知道它为什么给我这个错误？

var bitcoin = require("bitcoinjs-lib");
var buffer  = require('buffer');
var keys    = new bitcoin.ECPair.fromWIF('cMvPQZiG5mLARSjxbBwMxKwzhTHaxgpTsXB6ymx7SGAeYUqF8HAT', bitcoin.networks.testnet);

var newtx = {
  inputs: [{addresses: ['ms9ySK54aEC2ykDviet9jo4GZE6GxEZMzf']}],
  outputs: [{addresses: ['msWccFYm5PPCn6TNPbNEnprA4hydPGadBN'], value: 1000}]
};
// calling the new endpoint, same as above
$.post('https://api.blockcypher.com/v1/btc/test3/txs/new', JSON.stringify(newtx))
  .then(function(tmptx) {
    // signing each of the hex-encoded string required to finalize the transaction
    tmptx.pubkeys = [];
    tmptx.signatures = tmptx.tosign.map(function(tosign, n) {
      tmptx.pubkeys.push(keys.publicKey.toString("hex"));

const SIGHASH_ALL = 0x01;
return bitcoin.script.signature.encode(keys.sign(new buffer.Buffer(tosign, "hex")), SIGHASH_ALL,).toString("hex");

    });
    // sending back the transaction with all the signatures to broadcast
    $.post('https://api.blockcypher.com/v1/btc/test3/txs/send', tmptx).then(function(finaltx) {
      console.log(finaltx);
    }).catch(function (response) {
   console.log(response.responseText);
});
  }).catch(function (response) {
   console.log(response.responseText);
});
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