{
  "manageEntity": {
    "action": "Save",
    "entityId": "591468",
    "entityType": "Track",
    "nonce": "0xae8bb615d379ad71ba2b433cc34d7bd3af45d2abbb96f46953976ba50af0c397",
    "signature": "0x87f89d97827541d557fd38fef401aaf94b00a2d4fc7c846b6d914a2d2d3730ac097570dd30d2803548a40f9aee29ef8cdec5f3e8631d8f85a1a5d1c8840441641b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}