Are there technical specialists from blockchain.com here on the forum?
Unfortunately, I'm not sure that technical support understands me correctly...
In 2014, when blockchain.com was still called blockchain.info, it was possible to upload your wallet.dat (from bitcoin-qt) to import addresses and keys into the wallet.aes.json.
I took advantage of this and imported my keys/addresses there.
But a little later I removed the keys from it, leaving only the addresses for viewing.
Over time, my original wallet.dat was deleted by mistake (a long time ago, it can no longer be restored).
Now I have a question for blockchain.com: do copies of the uploaded wallet.dat remain on the bc.com/bc.info server and is it possible to restore it from there?
ps: wallet.dat file was actually uploaded to the server rather than decrypted locally, this can be seen if you look at the "uploadWallet" function:
function handleFileSelect(evt) {
...
if (f.name) {
if (f.name.indexOf('.aes.json') == f.name.length - 9) {
...
} else if (f.name.indexOf('.dat') == f.name.length - 4) {
showKaptchaModal(function(kaptcha) {
MyWallet.getPassword($('#import-password-modal'), function(password) {
uploadWallet(root + 'upload_wallet', f, function(response) {
function uploadWallet(url, file, success, error, password, kaptcha) {
var formData = new FormData();
formData.append('file', file);
formData.append('password', password);
formData.append('kaptcha', kaptcha);
var xhr = new XMLHttpRequest();
xhr.open('POST', url, true);
...
xhr.send(formData); // multipart/form-data
}
https://web.archive.org/web/20130507130854/https://blockchain.info/wallet/import-wallet 
