{
  "manageEntity": {
    "action": "Save",
    "entityId": "1338382704",
    "entityType": "Track",
    "nonce": "0x5080a523a5991c3f8809475e9bab919a66e8e779c026ef14dfb504824d063e6a",
    "signature": "0x66ea98d9303513c75cd9b7fff6326ea0e68ef4501d0f51acc8d8f6fc71bd7bdf7317625eca2d744726c99785c67adcbacf24a1a4911b79420b9e595b20bcc65b1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}