{
  "manageEntity": {
    "action": "Save",
    "entityId": "1840192448",
    "entityType": "Track",
    "nonce": "0x3f21c887b4199921745b6035b1a60383719a6eb8bcbe57601c584716a2666919",
    "signature": "0xf18ad00fa911b8484963444711a09e8396a023f5b11d3abf5740bc2a8ec653f801709815b50b8fc65666292fa0fa45765b296bd06f7fccfa5291ddab783a3c6a1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}