{
  "manageEntity": {
    "action": "Save",
    "entityId": "600886732",
    "entityType": "Track",
    "nonce": "0xdf90dc86c37611fa30427ceb5fef53ca9f945cbac4447c8703388ff34cff907b",
    "signature": "0xf1e708888fe4b48f9cd3259841f8af050c6b46d304a29c35040dbf3bd26f3f4517e4d88b6a9449fb58466113254febafb52cf7390b4103006ac6b70c1145a1f21c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}