{
  "manageEntity": {
    "action": "Save",
    "entityId": "1991851531",
    "entityType": "Track",
    "nonce": "1789850898013127056",
    "signature": "0x1d4e686d9a4163326469c0e99fc2372114097e96d380bde775ff4bbbd3f6a5535c571c05631dd68e56a1689e7a8cc134d7abc327e6e240d4910b7410ee9a2c131b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}