{
  "manageEntity": {
    "action": "Save",
    "entityId": "1548450545",
    "entityType": "Track",
    "nonce": "0xc463e5c770f86945aa673983eb0827c3e95a4a03a8746d125e87c6fbdfaa120f",
    "signature": "0x289b98873294973bb5531730808363fe413c2bea492a091f862d8101ba1c654a1e6f6dbaf67a1c81fec32e9f350d1e0e9359b27adbc0feb5d4aeb34357ab1a391c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}