{
  "manageEntity": {
    "action": "Save",
    "entityId": "854288403",
    "entityType": "Track",
    "nonce": "0x3ce3f780cdfd72e857deaf04accb85bb0cf817536195550a1ae897132b34a306",
    "signature": "0xe4544000e67456b63a607a45f0861f1dc8967272a4a0dffc0a43191c51c8435427170fe06f8fe638f71f177e9a963af3a48d753b4ab76fbef91aeeb85345e1151b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}