{
  "manageEntity": {
    "action": "Save",
    "entityId": "1066746327",
    "entityType": "Track",
    "nonce": "0x74716eeed489b18172c11017abf8482e746eb348191a2d8aafed20ab5e87efe5",
    "signature": "0xbd63b2d8b279863aac0409e6291e0f46a661e98509070ade5dd22b8f61dc5a8320f57f441eabb7075965e3ad0547b1999eb3842ef713d890b5596f89200318981c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}