{
  "manageEntity": {
    "action": "Save",
    "entityId": "434441538",
    "entityType": "Track",
    "nonce": "0x432f291288728da0ff10ef3689317ea1e5aaddbe0fa82b176b85e62b3964a3c4",
    "signature": "0x4f1950956be779343ac1137af08eef4e2200b56485e6daf6689cc20db9f64aac5ce210f2ba8ba7393d0ed4495a677b1cbc587278f5b354cba1bbb79be07179971c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}