{
  "manageEntity": {
    "action": "Save",
    "entityId": "882874190",
    "entityType": "Track",
    "nonce": "0x4191da5016d4e1b8749e7d36d5ccde6d4c4c9f473a8e3650b9e7167937cf9ed8",
    "signature": "0xcfe45423a2743d201688c789f475ac0b86a0df317fab977459043a24b7eb40e07eb67b2623c79d6469abedd1db1a29d05decad217d08fb0f67afd07d874de8d11c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}