{
  "manageEntity": {
    "action": "Save",
    "entityId": "445337689",
    "entityType": "Track",
    "nonce": "0xef27a4cd7929acd48db89ae524059846943e3508d8f84ebc9a6b6cab95a7e1d6",
    "signature": "0xb7453dd8f5cc4b3f6b94ec02e355b3bd55c512b23c8d907affdbfeb3908ff368633ff4b0c050a9ad90034c49ced906653b7c91025894638ab7221039db7d4b281b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}