Topic: Altcoin: transactions stuck in pending state (Read 309 times)

It is not stratum who add the transactions to a block, it is the coin itself. I am not familiar with Litecoin, but with latest Bitcoin, it is located in 2 places, validation.cpp where the block is validated, and mining.cpp where the block are deciding what to add to a block or not and take save the final product to the blockchain.
There are several problems, the blockchain is complex.
- when a transaction is created, be sure that the fees are enough and not too much. Transactions generated by the pool for example will by default have a wrong fee.
- be sure that the Stale is not too large or the blocks cannot be included
- check IsTrusted
- remove the Witness checks since it cannot work with a new blockchain.
etc...

You have not lost your 300 tx, if they are not confirmed for a while (3000 seconds I think) they will be cancelled. If they are in mempool, they are not in the blockchain yet, so your blockchain is clean.

Also be sure that all your nodes have the same proof of work algorithm, the same GetSubsidary functions, so that they can confirm the transaction, if one is different it will reject the transaction and the tx will stay in mempool until cancelled.

Also all the tx generated by yiimp have a wrong fee at starting so enable the fallbackfees.

Yeah, auto ready is already checked :/

I really have no idea why this is happening. My TTF is 2 minutes.
I tried to find some config to force stratum to give priority to mine transactions blocks.

The "default" config is looking for profit. I would like to change it to make the network go on.

We are really in trouble here. More than 300 txs stucked

Stratum should mine if your coin is working correctly.
Check that your coin has "auto ready" checkbox on. Stratum disabled it if the coin was not mining correctly.

Thanks for the reply.

I think this is probably a problem with Yiimp/Stratum itself. We mined almost 2000 blocks in the latest 24 hours and have no success getting any transaction mined.
Just new blocks. My altcoin is forked from Litecoin 0.16.

There's any way to kinda force stratum to mine transactions first?

Until our listing in an exchange we don't use to have this kind of trouble.
But now that we have lots of transactions/day there's a lot of tx's on mempool.

Grateful!

It is related to an incorrect fee or difficulty. Bitcoin does not check the old transactions to avoid these kind of problems but altcoins cannot avoid them.

Check in mining.cpp the TestPackage and TestPackageTransactions functions. Add a printf to know what is the false condition that is blocking the tx to be accepted. Comment the one that poses a problem -> your coins are saved and spendable.

I think I'm having the same problem. My Yiimp pool is only mining new blocks.
I have 159 transactions on the mempool. The pool hashrate is good.

But no matter what I can't mine transactions in blocks. Only new blocks with regular reward.

The last mined transactions are from 5 days ago.

Can anyone help me?

I don't understand what you are saying, and apart are you sending the token from etherwallet or blockchain?? Kindly provide us with full details of what really happens so as to know how to help you on this.

Thank you for your support. The issue has been resolved. It was related to YIIMP pool.

What coin do you fork? Bitcoin is not using solo mining. You need to use Stratum.
Generate is deprecated for a couple of years now.

About being stuck in the memory pool that means that you do not have enough confirmations. You need to mine 6 block or more (depending on your settings) to get the transaction confirmed and available (saved in the blockchain).
Proof of work not met error can block a transaction too. This can happen if you changed the Subsidy code in validation.cpp, this is a hard fork of the blockchain and will block your coin.

I made my own coin and hosted the node. I have already made the changes earlier suggested by you. Now the problem is that the transaction stuck in memory pool and once I generate the coin using generate the transaction are done. Please help

Can you answer to a question OP if you don't mind? What coin you sent and was stucked? Or you created own coin for test and you host own node and all what is needed?

just cancel it, if it's still possible and wait a few more hours or days, then do the transaction again. I have experienced that, and the reason they often say that wallet is being maintenence.

check my post here: https://bitcointalksearch.org/topic/complete-guide-on-how-to-create-a-new-alt-coin-update-2019-5134256

It is a problem with SEGWIT.

my miner is generating coins and not mining transaction they keep stuck in memory pool and when I generate the coin in the console then these transaction reaches to confirmed state can you please guide me on this. Please help me out I will be very grateful of you.

You need be sure that Yiimp is setup using an address from the wallet installed on the same server.
Of course you must have stratum running.
And you need to run your coin with in command line yourcoin-qt -deprecatedrpc=accounts

If it is still not working, edit the stratum source code and remove the test that is shooting the error and see what happen.
Also to check if your coin is correctly configured, go in the backend of Yiimp click on the symbol of your coin and you will see an Option to open the CONSOLE.
Do it and type getblocktemplate.

If it does not get you an xml like answer, then you have not fixed the problem.

I was having the same issue and then I followed up your advice and things worked for me. Now when I am mining the coining it is showing that the address is not mine. Please help me out with it. I have tried YIIMP POOL.

I will answer to my own question.

What is blocking the transactions is segwit...check


and remove the seqwit security check at the early stage of the blockchain.

The problem is simple, I mine a couple of blocks after the genesis, then I do a transaction (send let say 20KYF to another address), the transaction is showing in the mining wallet, the transaction is showing in the receiving wallet.
I mine 2000 blocks more, but the transaction stay pending.
nDepth=0 shows that the transaction is never added to a block.

I try to change the fees and resent the transaction everything is working normally except that again the transaction stay in Pending and I never get it confirmed.
I have changed the code to show it confirmed in the wallet, and also fake the confirmation, but the real issue is that the transaction is only in mempool and not added to a block.
Even if I use a huge amount for the fee.

I have 5 nodes running, but I guess only one node could confirm 1 time. But in my case nothing happen. I try to understand how the whole confirmation stuff is working, specially at the early stage of a blockchain.
I have the feeling that there are some test or some condition that prevent my transactions to be confirmed, because it is at a very starting, or maybe because the chain work is not big enough, something like this.

Note: I use Bitcoin Core 0.18 for my tests. These problem might not happen with a Litecoin or Dash fork, but the latest (0.17+) Bitcoin Core have an insane number of tests in validation.cpp, wallet.cpp, etc... that these "old" coins didn't had.

Maybe it is a normal behavior if you have only one node that is mining? Or the blockchain needs to have a minimum of blocks mined to be "mature"?

I don't really understand fully what you are trying to talk about, what do you mean by you mined thousands of block and it's still showing unconfirmed.

Please you should be more detailed about the problem you are facing so that we can help you properly, id you ran the miner and it mines a lot of block without you getting confirmation, then I think you should check to see how many blocks it would take to get one confirmation because some of the blockchain were actually fixed to 20 block mined before the a transaction is included in a block.