{
  "manageEntity": {
    "action": "Save",
    "entityId": "375237",
    "entityType": "Track",
    "nonce": "0x8f7f30b023c26873fcff7395ce8aa3b9234ff44284e1ca9cd428888e74b30fed",
    "signature": "0x21710045112a355b738d11392f43705d1fb204dbc34906a6bb874e111c83542b69c291852a78453f72836865cd1b72b7646a5db9c0dd123f29803dead232328d1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}