{
  "manageEntity": {
    "action": "Save",
    "entityId": "730626384",
    "entityType": "Track",
    "nonce": "0x4228e0dc2875ab8389f03bd958ee20fd482c2f93f5fab8960ecf56eac32df839",
    "signature": "0x24aa9adfd92061b51d97f97f655c30376e682043dab28e7ba731e39cb15a8f4261469faf7c3b09dc761cd1c7c14dfdaf11569b07647eb565ccfbf0dff2dc07371c",
    "signer": "0xC223750Aa22edc9792fAA6F22e1f273F30790c45",
    "userId": "1413474"
  }
}