{
  "manageEntity": {
    "action": "Save",
    "entityId": "399022908",
    "entityType": "Track",
    "nonce": "0x19c40dd90c4c4af2a8c785755d956f0c38cb62b174707451ea7bf4449ff570c0",
    "signature": "0xe3696f91125ada65693075f2143a2cd6ee3d1a41d6080058e4930649bcad38466d25c4cac73b7c89b5df1928ec6002bfe7e407fc8766a1e9c942d37837d945eb1b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}