{
  "manageEntity": {
    "action": "Save",
    "entityId": "1582421086",
    "entityType": "Track",
    "nonce": "0x505b4918ba0f16a23b5f4cb1047f662784e28dc2d8c43af99f72f15e0c15d49d",
    "signature": "0xe66e7e6aa7914c8ff0602dbfd6606b91aa0d3b76c0d638906197178ba4f7c30c7af80de9fe2d7dc86bf995620f6ea90f5c2450a3295f8feb696e706c5e1461c61c",
    "signer": "0xFe4E972E3ec8D8d619816F5644f74CB5bA1B01b1",
    "userId": "219239808"
  }
}