{
  "manageEntity": {
    "action": "Save",
    "entityId": "537706239",
    "entityType": "Track",
    "nonce": "0x804ad5495c340dbc8093cbdf00c0997ae59ba3a708f3bccd0a1e5ea5f41792ac",
    "signature": "0x6a1953ccc357763b8ca95e2b57fc0574b9a061309a92a26c3a158e27192f817e295eae87e08c962e36ae8f763429919f59ac7e7333d71de903aa916239ecdfd91c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}