Two years ago I formatted my harddisk and installed Windows 10 on it. Before this I did a backup, but unfortunately the backup was broken. So I lost my wallet.dat, with a few Bitcoins in it. I could restore some files with RStudio, and I had older backups for the rest, but seemed to be that the latest wallet.dat was already overwritten, and I frequently add new addresses. So I gave up, not a big deal, maybe $200 lost. But I didn't use the harddisk and bought a new one. Fast forward to December 2017: Now a few Bitcoins is some serious money, so I decided to give it another try. I tried any option I could find in RStudio, checking the dozens of filesystems it reported after scanning it for hours (only a few where valid from previous installations), but I couldn't restore it. Ok, this needed some more work. My assumption was, that the file headers were broken, so I wrote a small C program myself, which scanned the whole harddisk for the wallet.dat signature (testing for the first 16 bytes). The filesystem was NTFS, which has 4k sector sizes and a file starts always at sector start, if I understand it correctly, which makes things easier. Also usually if there is enough space, contiguous sectors are used to save a file. My hope was that somewhere I could find old version of the wallet.dat, but not too old that the new keys were missing. This is the very simple and straightforward scan program I hacked together: #include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
uint8_t buf[4096];
char filename[1000];
uint8_t search[] = {
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x62, 0x31, 0x05, 0x00
};
int main(int argc, char** argv)
{
uint64_t pos = 0;
FILE* f = fopen("/dev/sdd", "rb");
FILE* w = NULL;
int walletNumber = 0;
int walletIndex = 0;
uint64_t max = 1000000000000ULL;
while (1) {
int c = fread(buf, 1, 4096, f);
if (c != 4096) break;
if (!w) {
if (memcmp(search, buf, 16) == 0) {
sprintf(filename, "wallet%i.dat", walletNumber++);
walletIndex = 0;
w = fopen(filename, "wb");
printf("found: %" PRIu64 "\n", pos);
}
}
if (w) {
fwrite(buf, 1, 4096, w);
walletIndex++;
if (walletIndex == 256) {
fclose(w);
w = NULL;
}
}
pos += 4096;
}
fclose(f);
return 0;
}
I used it on Linux as my host system and the old harddisk was visible as /dev/sdd (you can see this with dmesg). I compiled it with "gcc -O3 scan.cpp -o scan" and started it with "sudo ./scan", and a few hours later (it was a 1 TB harddisk) I got a wallet0.dat to wallet9.dat, each 1 MB in size (it doesn't matter if there is crap after the wallet data). This was a nice start  Then I tried to copy it to a wallet.dat of a current Bitcoin installation, but most of the time it said the wallet was corrupt, once it even crashed at start and when it said it could salvage some information, no keys were in it. My rescue was https://github.com/joric/pywallet This program could decode all files and output it in JSON format. It needs the wallet.dat in a bitcoin-qt installation in the .bitcoin directory. I knew one of my old addresses, so I wrote a script which did test all files (actual key changed) : for i in $( ls wallet*.dat ); do
echo item: $i
cp $i .bitcoin/wallet.dat
./pywallet.py --dumpwallet --datadir=.bitcoin | grep -i 12QDRXssT63Pv5KTGBN2kyAvfLW3s7jxBs
done
The output looked like this: item: wallet0.dat
item: wallet10.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
item: wallet11.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
item: wallet1.dat
WARNING:root:encrypted wallet, specify password to decrypt
item: wallet2.dat
item: wallet3.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
item: wallet4.dat
Traceback (most recent call last):
File "./pywallet.py", line 1706, in <module>
main()
File "./pywallet.py", line 1683, in main
read_wallet(json_db, db_env, True, True, "")
File "./pywallet.py", line 1556, in read_wallet
parse_wallet(db, item_callback)
File "./pywallet.py", line 1287, in parse_wallet
for (key, value) in db.items():
bsddb.db.DBPageNotFoundError: (-30986, 'BDB0075 DB_PAGE_NOTFOUND: Requested page not found')
item: wallet5.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
item: wallet6.dat
WARNING:root:encrypted wallet, specify password to decrypt
"addr": "12QDRXssT63Pv5KTGBN2kyAvfLW3s7jxBs",
item: wallet7.dat
WARNING:root:encrypted wallet, specify password to decrypt
item: wallet8.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
item: wallet9.dat
ERROR:root:Couldn't open wallet.dat/main. Try quitting Bitcoin and running this again.
So the address was in wallet6.dat, success! I then used "/pywallet.py --dumpwallet --datadir=.bitcoin --password=mysecrectpassword > keys.txt" and I got all my keys back. In the bitcoin client I could import it with importprivkey (don't forget the "false" parameter as the last parameter, to avoid rescanning after each import, if you import multiple keys) and after the final rescan, I got my Bitcoins back. One day work for like 2 Bitcoins, which I already sold, that's a nice hourly rate  Maybe this will help some other people as well. In case you rescue a lot of Bitcoins, I would really love it if you would send me some to 1HagWYdLaFRbXwUfzbuWzcDc4WzmsRGqg7. Marilyn wishes you a merry Christmas, a merry Christmas, And a happy New Year! That was a roller coaster of a ride  , you were very lucky and that was a great christmas present for you. If only I could have found old wallet dats I mined, but of course I am a late adopter in terms of you all. I would love to one day say that I made a great decision to invest in bitcoin, again great job to you and I am glad you found the very thing that has made you happy this year! Merry Christmas! |
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Invest in bitcoin now, there is never a better time to do it than to have adoption in a day. Adoption for bitcoin is the greatest thing to happen since fried bread and I am thrilled to be part of it. Bitcoin is the best investment you can make now, not fintech companies that are highly centralized and provide no real value. I suggest bitcoin should be bought now because it is in dip mode.
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Bitcoin will survive forever, it is the next big thing and will continue to stay until something better comes along (Which probably wont) because bitcoin will adapt quickly since it is software. Fiat currency can never adapt and the evolution of money will continue until we hit a s curve top point.
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In terms of pricing yes it is still around 10,000 USD, but you have to believe what it is worth. I believe it is worth a lot more than that and I can see it rising to even 200 thousand usd someday, I am not that rich so this can be good booster for me.
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Transaction fees will be solved with the coming of the lightning network, we are all hopeful and you should be too! Low transaction fees will boost adoption in the next few years. There are lots of good projects trying to solve this problem, good luck to all of them. I just read very interesting use cases of IOTA, Lineage, Raiden and other scaling solutions and I love what I see.
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where is the team dev, you talk all this but you have no team. Where is the 10k prize proof?
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Is this a real thing, is this related to the official 2x fork or is this another with the same name
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Love the name, remind me of a rolex but there is no blockchani proxy already like mysterium?
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Is this is a necrod thread or is it still alive.
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All hail the king arjen20 This is signed on Christmas eve  1HbknZ8UMJ51PSDzVNjwX9gQL7EywoXJaX IE444q1wNik+RAI1NLfFrPhicfOmbq0Ebl+SHMjEwm9RGB5cbCuYlTdLoH0SyUUAihzOIjZfTtFKM/eFjETn1po= |
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opo dapat talagang magbuy na ngayon kasi para sa akin bumbwelo lang si bitcoin baka next days or months almost 1m na yan ito na nga siguro talaga yung pagkakataon to buy bitcoin
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Im use myetherwallet for receiving token then coins.ph for receiving php and bitcoin
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sa tingin ko wlang kasiguradohan kong aabot ng 1M ang bitcoin kasi minsan baba taas naman ang nangyayari ngayon mas lalo this week tumaas ng husto then bagsak din agad
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sa etherdelta p0 sa mercatox,bittrex,yobit pwede ka po magtrade diyan sa mga yan ako kadalsang gamit ko etherdelta at mercatox mas nadadalian kasi ako yang dalawa lalo sa pagtatransact ng mga token mas nasanay na din kasi ako dun
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para sa akin ok nman po kasi kikita ka ng Malaki dito kahit Malaki ang fee sa kuryente makikita mo din yung profit mo mas maganda siguro maginvest ka na lang o di kaya sumali ka sa mga airdrops o di kaya mag bounty and sig camp.
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para sa akin parehas lang po kailangan kasi ang bitcoin need ng users at investor para mareach yung goal nila
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para sakin as long as madami nagiinvest sa bitcoin hindi yan magdadump magdump man yan pero konti lang bubulusok pa din yan pataas hanggang sa mareach niya yung value na gusto nia ireach kung may invest ka man sa bitcoin mas maigi siguro na magconvert ka muna para mabawi mo atleast yung tubo na lang ang tumatakbo para at the end hindi ka manghinayang
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halos ganyan din p0 sakin ang laki ng kaltas ng coins.ph hindi ko din kasi mawiwidraw yung eth q papunta kay btc qng around 2k lang nkaraan nagexhange ako ng eth to btc lahat lahat dapat 3900 di pa bawas yung fee dun nung pumasok na sa coins.ph ko 3,200 na lang halos 700 ung naging fees sken wala na din ako nagawa.
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seems very interesting project good luck
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