{
  "manageEntity": {
    "action": "Save",
    "entityId": "383575444",
    "entityType": "Track",
    "nonce": "0xed9d95552f369c36e557a5f08e854b93b8dc965482443d002275c3e5c04225e5",
    "signature": "0xd44af905514d6517552fad7ba97b8feff565b017e580c6841a4960f91ab9623a0fcb1e57bc0b8eab9a6e85ae2853ceac0579b052034b1a77e334d024adc6203e1c",
    "signer": "0x1Ffe2D421cF901dE6a191F85092964B85B3Ce4d0",
    "userId": "452108975"
  }
}