Delist Notice: Signatum
As the vast majority of Signatum customers will be aware, there have been recent issues with this coin, which has led to us putting it in the delisting queue. Signatum is currently scheduled to be delisted on 20 Oct 2017. Read on for the reasons why this has been deemed our best course of action at this time.
The combination of us having 18,000 addresses and users mining directly to our addresses caused there to be over a million small inputs. This caused the wallet to irreparably break while syncing. We attempted to resolve this many times, using different distros and hardware configurations, however this did not work. If we synced the blockchain first, then imported the keys, it would start importing 5-10 keys / second, however this rate drops to about 1 key every 3-4 seconds after ~15k. After a week of importing keys on several instances the wallets corrupted and crashed every time. We also tried importing the keys first then syncing the blockchain, in this case it synced back to around 19th August and then also crashed and corrupted.
We have determined this to be likely due to the leveldb library used within the coin which is extremely out of date. It is the same library used in many other coins, however most use a much more up to date version.
This is why the Signatum wallet had been in maintenance for around the last month, while we have been constantly attempting to work with it. During this time, we had a Signatum team member visit our office in person and found no issues with our implementation of Signatum, and observe the sync issues. We have also been in constant communication with a Signatum team member informing of what was happening throughout and were told by him that he was informing the rest of their team.
To finally resolve this, we have managed to set up 8 separate wallets and imported 1/8 of the overall keys into each of these. We then had to move transactions around to consolidate the tiny inputs. This is a terribly painful process and not scalable.
FYI we are currently having to move coins from the 8 wallets to 1 consolidated wallet to process withdrawals. Once this process is complete, we will then scan the 8 wallets for any missing deposits, so anyone that has made deposits while it has been in maintenance will have to wait until this before their deposits show up so they can withdraw again.(edited)
The reason we are now closing the markets is that the Signatum community and now the core Signatum team have blamed us for this issue and are threatening us with litigation, when the issue is purely with the Signatum wallet and out of date codebase. The dev does not seem able or willing to fix the issues with their code. We have put in a very significant amount of time trying to get this up and running so our users can use their coins. However, it is not our responsibility to work with the Signatum codebase (or any other coin) to fix their problems any further, we've already gone well beyond what we should be doing to resolve this.
Some users have been comparing us to other exchanges and asking why they don't have a similar problem. We have a significantly higher number of transactions than the other exchanges that currently list this coin. They will run into similar issues when they reach a more significant level of transactions. The problem with Signatum codebase is provable and replicable. They need to fix this or this will happen again wherever Signatum ends up.
Signatum now appears to also be threatening Cryptopia with legal action (via twitter) and accusing Cryptopia of not knowing how to use wallets. We run and maintain literally many hundreds of wallets. Signatum built just 1 wallet by copying very old code from elsewhere and don't seem able or willing to update it to something that actually works at scale. Draw your own conclusions, and if you back Signatum after all this good luck to you.
Published by: Hex @ 9/19/2017 2:49:29 AM
https://www.cryptopia.co.nz/News 
