{
  "manageEntity": {
    "action": "Save",
    "entityId": "491849028",
    "entityType": "Track",
    "nonce": "0x13f72a48bbd58f23bd7c6191a93a4b6d7efdab899618999308f4589b8db9f97a",
    "signature": "0xb50ad1ec83dfd920623a983437661842634b80a6a70fc52f9f73baa81f07da4c00e5ef01f2683749c740b6bbb0a7c7f7f3d0ca91345279efee93efeb8cf418c51b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}