{
  "manageEntity": {
    "action": "Save",
    "entityId": "521785509",
    "entityType": "Track",
    "nonce": "0x69df9ff2cea9c434b965b0b8379eeb9f06676879bc9173639349faf317851a4d",
    "signature": "0x430d7de9589e66d484f2702a2ff01139117c0aea3072c98320d5d6f457a9d2f41d5cc18e55024bd77ed7a27a767c16597effcd0498e382fd87835234b5a74e6f1c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}