{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x123c6b4c8946f871a7263235389c1e7f4fb685b81f5bcfd2f3a56138cc6b6965",
    "signature": "0x4557e04fd1f67c979806df5bdc1b79d1da58522ef604331eb90a33f8b76d78e7263de9c45982f098a8f3c598bdedcf391b10fc99c67d0336cc18cef44bbfdf3f1c",
    "signer": "0x54BF9B0EaE7DC0d6695ede587b0f13d57e94848f",
    "userId": "96649040"
  }
}