{
  "manageEntity": {
    "action": "Save",
    "entityId": "200410530",
    "entityType": "Track",
    "nonce": "0x8f4f1ca7bcfaa05143579f4fb1897faedc0ccd9decee79fe9a19cfb4a0e5619c",
    "signature": "0x449dc66b26b164b27e09bb7fc858bac772efafdbb2ca470458d9dec753a10b1d4602ddad82516ebb0f87c9b392660fb9b72f58f128965e75b0e2dce03b1e4a771b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}