{
  "manageEntity": {
    "action": "Save",
    "entityId": "288367",
    "entityType": "Track",
    "nonce": "0x130cc8f0725344bb8156011dbdea22a406dca6815dbabe2da802ec69867684a1",
    "signature": "0xd6f3fe5b63f5792c6589992096ac5ebbe93256fc75767cbbbdb73bd32b35863157cb333b697b0031879f117f04cd708fa9283784bff35c8736b957e2df7d0a981c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}