{
  "manageEntity": {
    "action": "Save",
    "entityId": "399892480",
    "entityType": "Track",
    "nonce": "0xe5f7ba863ece772580187817ab5bc0c1c8eb116face0548ebe2ab6baf35c2440",
    "signature": "0x2426bedf2152f402ecaa4a2a885f963d7f3d5f1c94235158139203332929effa70b120ea471c4e2eacdf41bae0bbf9389d7b29698c23cb8d1f86f9d6dcdb7c201b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}