{
  "manageEntity": {
    "action": "Save",
    "entityId": "544576",
    "entityType": "Track",
    "nonce": "0xed3afe0af002b5f90c74be478c33df1d2163f43912d8e505bb61e9a1741951d4",
    "signature": "0x8cd5a5cfed0ee0d15c6cf4b79ab51c0fc8394959ccec69f3191e62c0a81fb602604a7ce7e646ccf630f56b5b4527a6410c9b6ddd53975807f8b9f9f61d7cc1261c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}