{
  "manageEntity": {
    "action": "Save",
    "entityId": "399229330",
    "entityType": "Track",
    "nonce": "0x939f04985d9d08683f0cb23e85a67090f652efecade6ed461cacd66278a4a9b7",
    "signature": "0xa3028c99cf4143cf92441e45246dd24c48cc941f7df1c10a7ba39a816059150e4887e0f8f27a44ecbe83de2b9c0ee79142444c77bd1ee40ab38bdc5b7a52f6561b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}