{
  "manageEntity": {
    "action": "Save",
    "entityId": "774008",
    "entityType": "Track",
    "nonce": "0xc273a099d75429819e3b90276e077fa4b5ac8d49641b3f7780ee52b36df4ceeb",
    "signature": "0xa19783cc9143e772056ab182b96f034bc37310e034ad59510a5e42b952747ef416bdd5d238567eb25be6ac8a0ad12fd8c0c4bf3d0f5d2d5c897617901b1178561c",
    "signer": "0xd9bA17330fFb3Ea1356C5eC14971D9e1f2cb5200",
    "userId": "337125448"
  }
}