{
  "manageEntity": {
    "action": "Save",
    "entityId": "306611790",
    "entityType": "Track",
    "nonce": "0xbc9ebb395f2ae867d73fe203adccdaac5139f3c16b646f987f35ec00165a42ae",
    "signature": "0xe78a5f9e143035b929d83f1ad527eda50e2cda712f9946bf46970dbe3f676f352412675887de4aff08e69f8ae403f0f72d61501a5b406d0c4aefa6c70fc947191c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}