{
  "manageEntity": {
    "action": "Save",
    "entityId": "149207506",
    "entityType": "Track",
    "nonce": "0xd20dfbf2298db308d8d4caa6271562c774730b9c19756f1566a4bba158da1e2b",
    "signature": "0x65380a2c65263ed761a17334ef82604081c91e583302c8b0105eb6b9214a74d02ea890832ff79d98a339a4867b586681c193d697990bb4dddb378cbfdf743f4b1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}