{
  "manageEntity": {
    "action": "Save",
    "entityId": "1487571159",
    "entityType": "Track",
    "nonce": "0x33abce53f9d0afe0fb1f8abc0d7ed620311e373f450a00231b87d228c1064253",
    "signature": "0x6e6bfbcb4ca54267293bfc9d20493424b1473b16cd6a4b64e4b4a1eb9ff137cf2355b13c8c911a3657bf36de65325e593b4c6181e64d1499f282a5c19e1269441c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}