{
  "manageEntity": {
    "action": "Save",
    "entityId": "87911516",
    "entityType": "Track",
    "nonce": "0xa1910cc07a0d4bef80b2474d14c52e2ee6382e6f771ac46d6a8b9667d1c7f409",
    "signature": "0x66e3a9a7049c7cfcab90052844648567be6dc0b24585671a7c0c8e7a618794c64312a6b33b3421b030bd0d100ff46350657a6be7bab14539a9804595837573811b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}