{
  "manageEntity": {
    "action": "Save",
    "entityId": "215077",
    "entityType": "Track",
    "nonce": "0xe8bc6cad93121c4f4ec93015422e45777408e52811acbd9a612f4e893cabfb3a",
    "signature": "0x9d184c868f2e8f111cc93bdccf9f122b32345150b80b9bed0cc8d2534c40dd2b408d533e72c5835b7e7ab530c871f4acd734992a09667a2ae7f3984da93c75491b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}