{
  "manageEntity": {
    "action": "Save",
    "entityId": "1408516521",
    "entityType": "Track",
    "nonce": "0xf15481bf66825190201aae9a1b552b42e4124ac11841c817c93b273a973e8b58",
    "signature": "0x104d260eee12ca8fe8f6e4ddaacfb3215581ea133a8d6711206dbb6d49322a6c2948b8924a0abd3a720de520c7296d7359bc01e3e1c265de794a639fbaca99791c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}