{
  "manageEntity": {
    "action": "Save",
    "entityId": "497121",
    "entityType": "Track",
    "nonce": "0x3b56a870f064469576342374582836e611d41ec7cfad62c083c3825c64092e13",
    "signature": "0xb0ce5f44fa2c2b12f24477e8f37761112b6a3c13a955cc7ab473e4e922d2778a62e284ea0dced19b5be6453cefc77812c6cfc6d5c52a20d7475289dfae4f5c671b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}