{
  "manageEntity": {
    "action": "Save",
    "entityId": "1869333887",
    "entityType": "Track",
    "nonce": "0x157a5f762eb66fd9a2a926a523ce15efefef146e391391d83f2632d74da19510",
    "signature": "0xaeeec4fa58b3e25f8aa8f3b788c0d736f41963fdfa0c61c6973376be7f2364607ad24d0eb03f2f21d7bfaf2941ef303956676723475d1124e0d105f402646f6f1b",
    "signer": "0xFa7c9C053Eae032ea5c7E3079174f13AC66aF61b",
    "userId": "133205875"
  }
}