{
  "manageEntity": {
    "action": "Save",
    "entityId": "1602976213",
    "entityType": "Track",
    "nonce": "0xa8c1ef79949c474419faeda683a4d2e2771d8d3fc2721ea86c1f5a2e4c69c190",
    "signature": "0xf1177050ae3bbdc2e24c51ba85f8e9dbedcaecd9063c2e10fb8e8c0d9c99d3430f2f2c2befcfd1a1a77947623ff4149b9ae939f0d90a036cebbef314647f433a1c",
    "signer": "0x669C207e15A757a751fd8f623DFf054C6D3D0b05",
    "userId": "121458"
  }
}