{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564443616",
    "entityType": "Track",
    "nonce": "0xb6880e1c410a2ff4bba78f4dedd8305748dde99b294b71ad47aa03ba33eef5b7",
    "signature": "0x7b4bdca6b652cd302b06804051fe9cf81e0b2dcc184142698445d876398c102769f158895676ac124a8d150a1d74b2dcce406abea676cd3c1f2664f3a6c26b311c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}