{
  "manageEntity": {
    "action": "Save",
    "entityId": "942918040",
    "entityType": "Track",
    "nonce": "0x94c654affcfc8c5146bbd1b69e699c21e326055b9f2a1582fea39c7b2a70f754",
    "signature": "0x62d33e95a1e1683f59880a18004944c06db9d0df7d01fc7013c501bb0f4b7f900c6104fd28d27f14f25e6e56afde79ff685ce57b11717beb7ca4706b7321ac171c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}