{
  "manageEntity": {
    "action": "Save",
    "entityId": "250185",
    "entityType": "Track",
    "nonce": "0xc9ccb39130b72bb5f2badf55df16b2de32020af7d008f4abc63cfd7f1216053e",
    "signature": "0xfedbde876dcb462e258d96e6c475529b92f4f6284afd4c2418047bf21245f8437fb520349d11ddf233b3710b0ba7ada6b38b4aae390a865bdfac18666065c56e1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}