{
  "manageEntity": {
    "action": "Save",
    "entityId": "285510",
    "entityType": "Track",
    "nonce": "0x87e595b75a1b50ff7efaa468affc616c6f8413b509804f660931818ce7273ad6",
    "signature": "0x282321b10f7fdac4c215f5b202b69269937dff9f805f9457d3771793d47807f06deee5095b5d238301ad7422905a5609dddbfa8a8b4abe7eb0e8a1cc01b323cd1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}