數字貨幣的交易，表現形式就是數字貨幣在地址間的流動。主要分為兩種型別，一種是有主鏈的數字貨幣的流動資訊，一種是代幣的流動資訊。

有主鏈的數字貨幣流動資訊可以通過挖掘區塊資訊，獲取區塊中每一筆交易的流向得出。以萊特幣為例：萊特幣的每一個區塊中，有若干交易資訊，每一筆交易資訊中，包括了多條目的記錄和源紀錄，每一條目的記錄有流向的目標地址和數字貨幣的數目，但是每一筆源記錄可沒有源地址和數字貨幣的數目。那麼，問題來了，數字貨幣是從哪個地址流出的呢？每一筆源記錄對應的地址和數字貨幣的數目是多少呢？那隻好再用萊特幣客戶端按照源記錄中記錄的交易雜湊在去查詢一次了，這個查詢結果是一筆交易，這筆交易有多個目的記錄，怎麼確定該筆源記錄對應源交易中哪筆目的紀錄呢，源記錄中有欄位（vout）表示對應的是源交易中的第幾筆目的紀錄。

這樣，我們就能確認一次資金的流向了，但是，這個流向不一定是交易的。如果源紀錄包含coinbase欄位則是挖礦產生，這個就不是交易記錄了。其他情況也有可能是熱錢包冷錢包互相轉賬，這個需要通過分析地址獲取具體的交易記錄，因為，每個交易所的地址實際上是有規律的。

例子，一個萊特幣block：

{
  "hash": "5f3657ba49d63db21563e456453a7a84176f037ec9b33d9ec2eab6ad055d6f77",
  "confirmations": 872,
  "strippedsize": 215,
  "size": 215,
  "weight": 860,
  "height": 233,
  "version": 1,
  "versionHex": "00000001",
  "merkleroot": "7753b2a996a27da49e80dbe08e0e6ce4d95626da2bc7077f1032ecd0cf2ce9c0",
  "tx": [
    "7753b2a996a27da49e80dbe08e0e6ce4d95626da2bc7077f1032ecd0cf2ce9c0"
  ],

}

萊特的一筆挖礦交易（vin代表源記錄，vout代表目的記錄）：

{
  "txid": "7753b2a996a27da49e80dbe08e0e6ce4d95626da2bc7077f1032ecd0cf2ce9c0",
  "hash": "7753b2a996a27da49e80dbe08e0e6ce4d95626da2bc7077f1032ecd0cf2ce9c0",
  "size": 134,
  "vsize": 134,
  "version": 1,
  "locktime": 0,
  "vin": [
    {
      "coinbase": "044757964e0101",
      "sequence": 4294967295
    }
  ],
  "vout": [
    {
      "value": 50.00000000,
      "n": 0,
      "scriptPubKey": {
        "asm": "04509423d0bad7821efc05cd01b702ca479d871be8b4ec80caa6b8bdf4521e6adc5be4f6688f7818b5e04fed590c21dc2d9470d6f3c53931dff5bb1a953adda3b4 OP_CHECKSIG",
        "hex": "4104509423d0bad7821efc05cd01b702ca479d871be8b4ec80caa6b8bdf4521e6adc5be4f6688f7818b5e04fed590c21dc2d9470d6f3c53931dff5bb1a953adda3b4ac",
        "reqSigs": 1,
        "type": "pubkey",
        "addresses": [
          "Lhuxi3MegDB6G5HJXn7iDXYCjjJeASksSK"
        ]
      }
    }
  ]

}

萊特幣一筆轉移（vin源記錄有一筆，其中的txid和vout欄位標識源記錄的交易hash和在源記錄交易中的第幾筆目的記錄，該筆源記錄是源交易a68603a36295411e385d0e81e93a30971815b2c5c9f4ad804c12b31854737e3c中的第0筆目的紀錄，vout目的紀錄有兩筆，value表示每一筆目的紀錄的轉移數目，addresses欄位標識目的紀錄的地址）：

{
  "txid": "a25e496c5806c6ef1450176601f759fd28af404fd64228005d63a4e762fddc6e",
  "hash": "a25e496c5806c6ef1450176601f759fd28af404fd64228005d63a4e762fddc6e",
  "size": 258,
  "vsize": 258,
  "version": 1,
  "locktime": 0,
  "vin": [
    {
      "txid": "a68603a36295411e385d0e81e93a30971815b2c5c9f4ad804c12b31854737e3c",
      "vout": 0,
      "scriptSig": {
        "asm": "3045022100911cc41db021b836343c6ca300cf260d551d609ee063c162eb3da6e801d4e542022075b7801722465fe99e472ecb76fa4d1152b90eb55dbc4c86dc23d2f1d346ce27[ALL] 0438e14c7e63456582fe669063a71adf3c2242e75548f57dc0e8a7ca11936fbb2fcbd76334ee67ab9f022ac2c841c06ecc4bb6ee844e4a6c5cff3e28327d02b533",
        "hex": "483045022100911cc41db021b836343c6ca300cf260d551d609ee063c162eb3da6e801d4e542022075b7801722465fe99e472ecb76fa4d1152b90eb55dbc4c86dc23d2f1d346ce2701410438e14c7e63456582fe669063a71adf3c2242e75548f57dc0e8a7ca11936fbb2fcbd76334ee67ab9f022ac2c841c06ecc4bb6ee844e4a6c5cff3e28327d02b533"
      },
      "sequence": 4294967295
    }
  ],
  "vout": [
    {
      "value": 6.86484600,
      "n": 0,
      "scriptPubKey": {
        "asm": "OP_DUP OP_HASH160 cc0eea1686e05f5457610ceb4ccdbea643882b4e OP_EQUALVERIFY OP_CHECKSIG",
        "hex": "76a914cc0eea1686e05f5457610ceb4ccdbea643882b4e88ac",
        "reqSigs": 1,
        "type": "pubkeyhash",
        "addresses": [
          "LdpuycmdLcERxResHd5D9nxsas9vbNxVa7"
        ]
      }
    }, 
    {
      "value": 0.78826300,
      "n": 1,
      "scriptPubKey": {
        "asm": "OP_DUP OP_HASH160 c1c6c0462c953f3d9779b31146685b71949b6fd3 OP_EQUALVERIFY OP_CHECKSIG",
        "hex": "76a914c1c6c0462c953f3d9779b31146685b71949b6fd388ac",
        "reqSigs": 1,
        "type": "pubkeyhash",
        "addresses": [
          "LctYmhiQ1RwXjA8iyRFJBLQrSvvjSm5AdM"
        ]
      }
    }
  ]
}

代幣以基於eth的代幣做例子。eth的交易分為轉賬交易和合約交易，代幣的轉移發生在合約交易。eth每一筆交易都有一個目的地址，如果目的地址為空，是建立合約，該合約的合約地址在“contractAddress”欄位記錄。如果目的地址不為空，可能是正常的eth的轉移，也可能是合約交易。如果是合約交易，則目的地址是合約地址。合約交易有多種操作，不一定是代幣的轉移。代幣的轉移主要通過“logs”欄位分析得出，logs欄位有多筆日誌，每一筆日誌記錄資訊主要在“topics”和“data”欄位，“topics”欄位的第一個值是操作的sha3簽名，其中選取sha3('Transfer(address,address,uint256)')這個操作即可。這個操作就是代幣的轉移。後續引數可能在“topics”的後續值，也可能在“data”欄位中。如果”topics”欄位後續值數目不能滿足Transfer函式引數數目，剩餘的引數的值在“data”欄位中儲存。詳見：https://codeburst.io/deep-dive-into-ethereum-logs-a8d2047c7371。這樣，就可以通過分析日誌獲取代幣資金的流向了， 當然要排除合約地址流出的代幣，這些並不是交易產生。

例子：一個以太坊的block解析，粗體為交易（有from和to，to為合約地址則是合約交易）：

{"jsonrpc":"2.0","id":1,"result":{"difficulty":"0xc6d2fa46fd6","extraData":"0xd783010400844765746887676f312e352e31856c696e7578","gasLimit":"0x2fefd8","gasUsed":"0xa410","hash":"0x9a834c53bbee9c2665a5a84789a1d1ad73750b2d77b50de44f457f411
d02e52e","logsBloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000","miner":"0x68795c4aa09d6f4ed3e5deddf8c2ad3049a601da","mixHash":"0x72224fd0b7b32d0fea13f2953eba28d2512af43632725ed75583dd30e42dfc64","nonce":"0xf1a453a44f9de627","number":
"0x100000","parentHash":"0x2dcaf9a8a3fd329d925eb47c1f22022d4f2d562500e546d878bad4247d013858","receiptsRoot":"0x178000485de197ed06a4ebada431864e5b564b43f994fb8888521f74b4b3257b","sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948
a7413f0a142fd40d49347","size":"0x303","stateRoot":"0xeaddaa0b6b673ba3f8cb7235ca656340ccf703295cf5252cb04a4202c47252c2","timestamp":"0x56cc7b73","totalDifficulty":"0x6bab93cdf810b22a","transactions":[{"blockHash":"0x9a834c53bbee9c2665a5a
84789a1d1ad73750b2d77b50de44f457f411d02e52e","blockNumber":"0x100000","from":"0x68795c4aa09d6f4ed3e5deddf8c2ad3049a601da","gas":"0x15f90","gasPrice":"0xba43b7400","hash":"0x01c5a8461d06c2c195035c148af0f871c7679841d86ae5bb98676bb2d8e68df
a","input":"0x","nonce":"0x2f31","to":"0xdae787ec66e65c60ad35203800b97b45fcb0f909","transactionIndex":"0x0","value":"0x2b81097c919a9e000","v":"0x1b","r":"0x1d263f32de00456cbc3e4099c623a6ca48e3188f01dd16461687512f8c3bb7d6","s":"0x62629f4
2a98f7c5fa60f8c3630cf67b5eb4772e0ff65a458d2116c15e22d6451"},{"blockHash":"0x9a834c53bbee9c2665a5a84789a1d1ad73750b2d77b50de44f457f411d02e52e","blockNumber":"0x100000","from":"0x68795c4aa09d6f4ed3e5deddf8c2ad3049a601da","gas":"0x15f90","
gasPrice":"0xba43b7400","hash":"0xb4216e88df6ebfe666bbe43370d1ddfe8d9c1975d2b8375a522700f7f59c3ed0","input":"0x","nonce":"0x2f32","to":"0x04a2a3ee9c9ea82e1f918ece209f8a7e6d7521e7","transactionIndex":"0x1","value":"0x377fb2f2cbd73c00","v
":"0x1c","r":"0xc25ceef654cd3bd734201fc08589970e0663431121bc47cc4a70335e072b09c0","s":"0x1c67b037a59a8f5badde3a7eb586d7888dcf6dad64aabb080c4c0db593a91254"}],"transactionsRoot":"0x91d9b419b34a790cc2a7d59c6b95e57ccc5ec9bc1034ce9510dfb551d

3049c93","uncles":[]}}

例子：一次代幣的transfer交易（topics第一個值是sha3('Transfer(address,address,uint256)')，第二個值是源地址，第三個值是目標地址，data欄位是以Wei為單位的轉移的代幣數目）

{"jsonrpc":"2.0","id":1,"result":{"blockHash":"0x0b7deffc8e3603870fe6caf6b0a3f7620cc4dd26c1950a25ce16dfbd94ff4ba1","blockNumber":"0x3f3711","contractAddress":null,"cumulativeGasUsed":"0x14da9b","from":"0x1c362ae991ff2b60c7f93eb1d2cc0237
51dcd8bc","gasUsed":"0xcbd5","logs":[{"address":"0x90528aeb3a2b736b780fd1b6c478bb7e1d643170","topics":["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef","0x0000000000000000000000001c362ae991ff2b60c7f93eb1d2cc023751dcd
8bc","0x000000000000000000000000bf6631ba138efb863263bd90f80fb5117676a129"],"data":"0x0000000000000000000000000000000000000000000000001111d67bb1bb0000","blockNumber":"0x3f3711","transactionHash":"0x5c2bf2b66fd7996030fccbd711263d4ecd7c2c3
8909b747902c0df0504f71d90","transactionIndex":"0x3c","blockHash":"0x0b7deffc8e3603870fe6caf6b0a3f7620cc4dd26c1950a25ce16dfbd94ff4ba1","logIndex":"0x3","removed":false}],"logsBloom":"0x0000000000000000000000000000000002200000000004000000
00000000000000001000000000000000000000000000000000000000000000000000000000000000000000000020000000080000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000100000000000000000000000000000000000000000
00000000000000000000000000000000000000000400000000000000000000000000020000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000","root":"0x
66ccd3b82b30ae6f6622827e17f1d9845369ca732310fafe3be4475c032db322","to":"0x90528aeb3a2b736b780fd1b6c478bb7e1d643170","transactionHash":"0x5c2bf2b66fd7996030fccbd711263d4ecd7c2c38909b747902c0df0504f71d90","transactionIndex":"0x3c"}}