{
  "manageEntity": {
    "action": "Save",
    "entityId": "121831731",
    "entityType": "Track",
    "nonce": "0x5c79bfe8eb5abb09528567150978f506c20cca1b0e52dc2c63869ee8e1cc77a8",
    "signature": "0x5fde9acc763989eba8c8eac5566d858653097699edeaff4fbfbaccf64636d7bb178442ba3d37f21653709fc132333568e8624a809aff185a4d5323e74e0da6961c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}