Bitcoin-qt is not opening

[BlackHatCoiner]

In the "blocks" folder... so that blk00000.dat file that is shown in your screenshot will have your block data in it.

Should I move the blk00000.dat to my other laptop to start syncing? I don't get why it ain't syncing.

[HCP]

It "might"... it's impossible to tell with these fork coins what is causing issues because of the mods that have been made... I haven't looked at mine in weeks and from memory, I had issues with it if I left it offline for a day or two, it would cause issues with getting it going and mining/syncing again

I can't even go and try to test my setup, as it appears that due to resource constraints, I deleted all the forkcoin stuff I had in my VMs

[BlackHatCoiner]

I recompiled it and mined 6 blocks. Still the PC doesn't receive any blocks. They do make a connection, but they don't transfer blocks:



What are they transferring then? What are these kilobytes? Handshakes?

[HCP]

possibly... or "transaction" information etc...

So, the 2nd PC is stuck on 'zero' blocks in the "information" screen?

[BlackHatCoiner]

So, the 2nd PC is stuck on 'zero' blocks in the "information" screen?

Yes, it's stuck with the genesis block. Any ideas?

[HCP]

From memory, it took a few blocks for the 2nd instance (was running in a VM), to decide that that was the longest chain and to start syncing the blocks... like I said, I deleted everything, so I can't test it now

When a block is mined on PC#1, do you see any of the "UpdateTip" type messages appear in the debug.log on PC#2?

Also, what are your settings on PC#2? ie. contents of bitcoin.conf etc

[BlackHatCoiner]

I define PC#1 as the one that mined the 6 blocks. PC#2 is the other one. Note that it took many hours to mine them. I don't like calling it luck, since it's possibilities, but I must have been unlucky.

When a block is mined on PC#1, do you see any of the "UpdateTip" type messages appear in the debug.log on PC#2?

It does show something. Here's my debug.log: https://pastebin.com/raw/JYpFCefd

Also, what are your settings on PC#2? ie. contents of bitcoin.conf etc

I don't have a bitcoin.conf file on my PC#2. Should I?

[HCP]

I define PC#1 as the one that mined the 6 blocks. PC#2 is the other one. Note that it took many hours to mine them. I don't like calling it luck, since it's possibilities, but I must have been unlucky.

That's why I spent a bit of time getting cpuminer/bfgminer up and running... it was quite a hassle getting one to work properly, but it definitely had a better hash rate than using generatetoaddress.

It does show something. Here's my debug.log: https://pastebin.com/raw/JYpFCefd

2020-12-23T12:47:03Z Synchronizing blockheaders, height: 6 (~22.22%)

Indeed, it seems to be syncing the block headers at least, so that's a good sign that it is connecting properly... for some reason it seems to think that 6 is only ~22% of the being synced... so you might need to generate "a few" more blocks for it consider the headers synced and to start collecting blocks?

I don't have a bitcoin.conf file on my PC#2. Should I?

Probably not necessary if it is connected and showing as a peer etc...

[BlackHatCoiner]

Indeed, it seems to be syncing the block headers at least, so that's a good sign that it is connecting properly... for some reason it seems to think that 6 is only ~22% of the being synced... so you might need to generate "a few" more blocks for it consider the headers synced and to start collecting blocks?

Isn't there a variable in the source code that sets how many blocks are "enough" to start syncing? There must be another way to sync, instead of mine ~30 blocks.

[HCP]

I vaguely remember tweaking something regarding blockchain and/or chainstate "size" in one of the "chainparams" source code files... I'm not sure if that actually has anything to do with whether or not it requires a certain number of blocks before syncing...

Really beginning to wish I had kept my modifications now

[BlackHatCoiner]

Do you mean these?

m_assumed_blockchain_size = 350;
m_assumed_chain_state_size = 6;

Should I decrease the blockchain_size?

Edit: 26/12/2020 - 14:37 UTC:
I changed both to 2 and it's working! Thanks!

[HCP]

Yeah... they were the ones I was thinking of... As I recall, they are different for each network type (main, test, regtest etc). I think I set my "mainnet" ones to be the same (or similar) values as the regtest ones and then it starting syncing better.

Glad you managed to get it sorted

[BlackHatCoiner]

Question, do I need to port forward in order to transfer information without having to be connected on the same local ip address? I remember that I tried doing it, but failed. On original bitcoin core, I don't need. I guess that I shouldn't need on this too.

[HCP]

It would depend entirely on your network setup and the way the OSes/firewalls on the PCs are configured...

[BlackHatCoiner]

Thank you, one last thing. In order to rename my coin from "bitcoin" to "altcoin", do I have to rename everything like this?:

Code:

find . -type f -print0 | xargs -0 sed -1 's/bitcoin/altcoin/g'
find . -type f -print0 | xargs -0 sed -1 's/Bitcoin/Altcoin/g'
find . -type f -print0 | xargs -0 sed -1 's/BitCoin/AltCoin/g'
etc

I did this, but it seems that I'll also have to rename the filenames too, because of this:

Code:

#include <qt/altcoin.h>

I hope that by renaming those too, I'm done.