{
  "manageEntity": {
    "action": "Save",
    "entityId": "413549391",
    "entityType": "Track",
    "nonce": "0x6d44d993bf3d890282c4a60bc1ce901cb68459b6bc46d9f65001a4b0a4af591f",
    "signature": "0xf16287ccb335fb3d08a7593e099050680504fc04b2a37cc6660f897b53a64bd933791a9e2050d11215f626920e042425c5082845fbccc270fe530c39d42595401c",
    "signer": "0xE50A7CF0F7C9D1ad4Ec8b26E4532CBF635c04e12",
    "userId": "357010"
  }
}