{
  "manageEntity": {
    "action": "Save",
    "entityId": "474964884",
    "entityType": "Track",
    "nonce": "0xa038225ef1f99b442ddbb512dd313fea536bdf6a9a5f13c8b20049e769433cb5",
    "signature": "0x0cd5ded124b1d31fff5e2aa3f9c2ca843cdb76f4dda0c853237473c2bb27f63e20063aa0e2f325bde8f1a2a7cbb0669648bd9be1f1a782cba5e53b19d208e4601c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}