{
  "manageEntity": {
    "action": "Save",
    "entityId": "307497",
    "entityType": "Track",
    "nonce": "0x5f8d33dbc15ba478445c87f6b30930d1fb0673a1f822ae0d8508ff265093f90b",
    "signature": "0x48842533268bcb1f7ff9797aaabf796e9ac8ee7e073795eff9bde311002b8f3c061c2da7587493a27d9cefa1ee40dd33196fa819b106d56dbea3f743aa6464e81c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}