{
  "manageEntity": {
    "action": "Save",
    "entityId": "292487929",
    "entityType": "Track",
    "nonce": "0x5fc709883e2a1296b9fc570a5f13ba8888bb5e023d405f6b9874018a6744e751",
    "signature": "0x428427a8679826b4b5f5adea1547a214f4021b34f99daa3a3fa9dc5afb981fda3406d62032c93db9de31eae191ad924d6dc9454b0ff49c90afcfd586e7fad6fd1c",
    "signer": "0x9668338741f0B2F3bcc87715a755f7FFACcEd1D6",
    "userId": "945181225"
  }
}