{
  "manageEntity": {
    "action": "Save",
    "entityId": "320496480",
    "entityType": "Track",
    "nonce": "0xf3bf6d911789259d932049f5e96fb95952eeddc4ca94659be20e68e688a8f8aa",
    "signature": "0x7a9e859c60d68b25325a20c9434e067bd6a741d07f85f0bd35a194b08b1cc9b678acede0ff0c721df10e205be45ceca06fb4b965170b5d65f0b5fc4c85d7f3021b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}