{
  "manageEntity": {
    "action": "Save",
    "entityId": "600175337",
    "entityType": "Track",
    "nonce": "0xe84bf1f43d036c87e28d48e0e2c4a3ed77f0c4ed7c660fbc031ff3a0b1f2e540",
    "signature": "0x874ae55951f0a1182b863b7af40d11ec0a544d663cead56eca46842eea785ab61cf5c57150eb5b724b97c3ac64ea9d15b38d593e496fc7725e82a23d54f10f401c",
    "signer": "0x334b140fE9d685A0b45ADF4b1666b979432E75c7",
    "userId": "550101899"
  }
}