{
  "manageEntity": {
    "action": "Save",
    "entityId": "508942867",
    "entityType": "Track",
    "nonce": "0x81e2a981293254bca6929d62cffda589dcd0b682d1eb890406ac403c1ec5036a",
    "signature": "0x62ec716088c5560805f74d1e5b24fa7ecd5799a2e0f3c9bd1b9986bd52529cd545295617d73d2cf9c95f673f17995b255ac12680029ebcdf20f7ad9642b0f7601c",
    "signer": "0x6802Fe39C5FA9f99ac1Aa32F164982185A3E70ea",
    "userId": "152482938"
  }
}