{
  "manageEntity": {
    "action": "Save",
    "entityId": "9748064",
    "entityType": "Track",
    "nonce": "0x5a49256cb0d8dfcb8c4667c26e0155e53cfd212366bd07d3e20b6ce66cf410c1",
    "signature": "0xc3afc58bfc048603c454d59005a3402d28998d26abb113be6570ebf614a44ba65670148b5b38501f11abfaa3e8d239f8f4320dc250481a4fc3c9345e9f6307b51c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}