{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391340610",
    "entityType": "Track",
    "nonce": "0x6972bfecaae520b3fa792b6c2f7890daa9c0bc3b8cedf278076e83052b995d21",
    "signature": "0x4609d03efce8d1a4f5ee9eaa7fc0d5d4593d747d32ada0f43bc1cc78330316740841ca8b024fcf7b31e7f829ef5bf1795ae16cea4fcf4f34ca5ac6503ebf815a1c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}