Download NuBits blockchain (bootstrap)

Can someone at least tell me how I can send my coins I sent to my wallet a week ago while I was waiting for the chain to download. I’m trying to send them now and can’t as they aren’t showing yet.

You can also make a raw txn without syncing the chain.

@ Nagalim thanks for replying. Very useful link.

I couldn’t reply or ask for more help because the forum had a block on how many posts I could make. Such a joke, the person that needs the most help posts more.

I eventually found out where to get my private key. God help a regular user figuring that out with zero documentation that I could find. This project needs a lot of things detailed better and a regular chain download.

Turns out I can’t sell because Changelly have dropped NBT. Is there another way to protect myself from the imminent price drop like converting to NU shares? I don’t know anything about them or how to convert.


Im downloading and will be seeding at maximum, at variable times because it’s not a desktop. The blockchain sync speed was long a frustration of mine, but thanks to torrents, it shouldnt limit user adoption.

Sure if the torrents weren’t so old, were advertized properly and had detailed instructions for newcomers.

The newest is 3 months old. There was a time where I spend that same amount of time syncing, on and off on public wifis in my free time. Nubits is small, and responsibility is spread thin. You are an early adopter to crypto and even earlier to nubits. Early adoption is often a hard era for any new technology. As for detailed instructions, I plan to test on my systems and make a quick guide to be published here.

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That’s good news regarding the guide.

3 months is too old IMO. 8 hours per 1% = ~90hours for me to sync after finding/downloading/understanding where to get and how to use the torrent *.dats. That’s an insane and unnecessary waste of time IMO.

Don’t suppose you know why Changelly have dropped NBT at this time? Lack of Liquidity Provider? I’m trying to sell my coins and cannot, which apparently would help to keep the peg.

Thats to prevent spam. Often forum moderaters on any site adopt similar rules or move posts to the correct category.

Nushares is the underlying backbone asset to Nu. Because of the recent BTC spikes/crashes and volume has gone up for Nu. Nushares are built to assist Nu community with the $1 peg per nubit, increasing NBT assets via grants, and NBT interest rates (and perhaps burning shares, dont quote me on that because its been a while since I read all the documentation). NBT is designed to be pegged to $1 (which will fall against BTC just like USD does), so if you are looking to isolate yourself from a NBT/BTC crash, either you would hold BTC or hold nushares (ongoing buyback at 32k a day). Heres where you can see what exchanges Nushares, Nubits, and BTC: Exchanges and Liquidity — Buybacks: $61,619/day
Ive never been aware of changelly supporting NBT. The exchanges Nubits supports are above.
As for how slow it is, Ive found that internet connection speed (providers are better at 12-5 am local time too) and how long the client is left open is important to sync speed. The more recent blocks are slower to download, just like bitcoin as more people use it and the blocks have more data in them. I suggest you open the client up at night when you are sleeping or doing thing away from keyboard. If you leave it open for 24 hours a day, thats less than 4 days. If you dont want to wait 4 days, then sol? I pretty sure that speeding up sync time is on the developers long term roadmap but it wont be available immediately.

If you want to understand more about nubits and nushares, please visit the white paper.

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Sorry to hear your struggles. Doing what I can for you. I had it downloaded in about 8-10 hours recently. As mentioned it may be a problem with your provider either throttling traffic or having a congested network.
I agree that things need to be made more user friendly especially for new users. We should review that on the list of priorities.

I did some instructions here: Download NuBits blockchain (bootstrap)

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I produced the following error when I:

Waited for first 10,000 blocks to come in and waited for nu to disappear from my processes list before I:

  • deleted block 1, block index, database folder and dblog, pasted blockindex, block 1
  • deleted entire folder, pasted blockindex, block 1, wallets and addr.dat
  • deleted entire folder only pasted blockindex, block 1
  • deleted only block 1, blockindex, pasted new block 1, block index

From db.log

file unknown has LSN 1302/985781, past end of log at 1/327
Commonly caused by moving a database from one database environment
to another without clearing the database LSNs, or by removing all of
the log files from a database environment
__db_meta_setup: [$HOME]/.nu/blkindex.dat: unexpected file type or format
Database handles still open at environment close
Open database handle: addr.dat/main

From debug.log

ERROR: CheckProofOfStake() : INFO: check kernel failed on coinstake … … …
WARNING: ProcessBlock(): check proof-of-stake failed for block … … …

I was going to wait 30 minutes with nu open, 30 minutes nu closed, then I screwed up halfway through. So instead, I dropped in my own blockindex and block 1 that I synced up to todays blocks and everything worked fine. Those blocks were downloaded via 5.02, and I have my “detach databases at shutdown” setting checked.

Maybe the bug in the Sept 17th torrent is the running os (Im running linux for testing) or the database wasnt detached before shutdown?
Im willing to make new torrent file and seed, if thats the case.

@woczqhas Perhaps that will help with the 3 month blockchain download time. I do apologize for being a bit callous. I think Im hangry [hungry anger].

I know the August one was created fine and worked, It is also smaller and therefore faster because it was tarballed (zipped) perhaps the September was not created properly. It is the first time I’ve heard issues with it but maybe not many users have tried or just failed and gave up without posting here. I’m seeding both and I know there is at least one other seeding.

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@woczqhas @Phoenix @jooize
Ive made a new one with my working indexes. Ill keep it seeding whenever I can (I have a laptop) and whoever has privileges to the website and bitbucket can add it and reseed. Ive zipped it with linux as a .zip (so it should work) but if windows users cant unzip it, Im happy to switch over to windows and make one that linux will also extract. I recommend that whenever there is an update, admins create a new torrent file, compress it and bug test it. Perhaps add it to the wallet page, and seed though the website itself along with instructions (feel free to copy mine below).

Magnet link (copy/paste into browser address bar with a torrent software installed).


After downloading, unzip the file, back up your entire nu folder in case accidents happen, and while nu is not running (verify in the running processes list), copy both files (blockindex.dat and blk0001.dat) into the nu folder (in linux thats home folder, .nu folder, or in Windows under %appdata). When prompted, replace the files (did you back the folder up? If need be, do so! Especially if you have nubits or nushares in your wallet). Run nu and check the last accepted block (under the help menu, debug window) to verify you have downloaded the most recent check point of Nu’s blockchain.


I’m downloading it and checking it out. Once I believe it is ok I will help seeding it.
Just noticed that you only joined the forum 6 hours ago.

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I joined to contribute more this round. I once joined during the major peg loss to inform people of the importance of the peg and to inform admins of the importance of community. My user name was CommunityObserver. I lost my password long ago. Someone else made a user name of ConfusedObserver. That isnt me. I also forgot to make the “these arent official files” disclaimer but I forgot. Thanks for verifying and not blindly trusting my torrent, in the spirit of nakamoto. :smiley:


Just extracted the files posted by @CommunityObserver1 without a problem after a 2 hour download. I’ve copied the files (and scanned for viruses) into a newly configured client. It all seems to work.
I’m also seeding the file so a download of those files should be quick assuming your provider allows you the bandwidth.


Hopefully this will save others the enormous amount of time wastage and frustration I’ve experienced this week. My sync is currently at 96% and the price has sunk so I might as well wait it out. Thank you both for your efforts.

I recommend keeping a back up copy on an external, selecting detach databases at shutdown setting in the client (so you can move the files to another computer, or upgrade the client without issues), and opening up nubits to sync about once a week, even when you have no nubits. Its what I do for all the blockchains that I use.

Thank you, @CommunityObserver1! Do you know if we can verify that @CommunityObserver is your old account so you can continue using it? PM me.

Can we have confirmations that these files work with each platform? Windows, Linux, macOS. I noticed when the blockchain began being recorded into blk0002.dat, that blk0001.dat wasn’t the exact same size on Linux and macOS.

Magnet link for latest blockchain snapshot


I confirmed it working on Ubuntu Linux earlier in the thread.