{
  "manageEntity": {
    "action": "Save",
    "entityId": "754229090",
    "entityType": "Track",
    "nonce": "0x0abb669da3a6e201508eab922c71671ea7b73a39796bd159d05e132fc559eba2",
    "signature": "0x8eba31fd64503a06a8d054108eb913b6fc3263fa00a09765f333f92a932b4808619a2a7245d1e63b14b63a9e7c3f035a26ba17fefa4df5bf12c2cb84e263036d1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}