{
  "manageEntity": {
    "action": "Save",
    "entityId": "1262322467",
    "entityType": "Track",
    "nonce": "0x883601708dae56c00ceae4546df08c156ac3995d68081c123327a534291d2e65",
    "signature": "0xb6a400809994561893d6cf421229c31fc56401dc4f1197b82fa63a5ac5dc54f732c3b6cf1ac27f3efa331b65ac92b03542c5ea90b45e1db20f0156bedbbf6f531b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}