{
  "manageEntity": {
    "action": "Save",
    "entityId": "874309376",
    "entityType": "Track",
    "nonce": "0x2e18e67b7beac3c9f8fb0b9bfc5f8c4e44f14ca9bb22c2f0b7c84a29e1b953e8",
    "signature": "0xd93a4f98a33b5c7c90e063249aef024764011ed50bcb870122308f52cb6d8ddc1f79ef2194e20d3f55fe49259e09861572e6fdb6f7bf268e8f11cc8ec929e2401c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}