{
  "manageEntity": {
    "action": "Save",
    "entityId": "685534",
    "entityType": "Track",
    "nonce": "0x602098d29669a9d362e15c3d26e1b7229d5daf0726e3229bc1def503f3dbbd07",
    "signature": "0xe2ec846e2db61b7c7e33f6e320f2a7cb7329a64fd297c72b975b60e7e8592266019b06ae242459360365a689d67fda9f4b19e611c98d6ab4030fd4cab75f78651c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}