{
  "manageEntity": {
    "action": "Save",
    "entityId": "554123",
    "entityType": "Track",
    "nonce": "0xbb4125f929f0190cddb085412fc64b4947e34f2ba9e32eb3d165b3417941b7bf",
    "signature": "0x59d60cb04de1dd3ad2521d344837c0e85eefea3778a7c1e5b409509c3d59ff0f397433b7262adfa74188bb9398cbc40e4fcc07dce42ca83ad3b791abc9b201021b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}