Excuse my ignorance, but how do I sync the wallet client to today's date?
Basically making sure you're connected to the bitcoin network, and wait untill it's sync'ed... On a slow pc, this might take a long time... Just have patience  |
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Network says 4 years and 49 weeks behind.... I don't see any transaction ID only number is the address I sent to.
You should wait untill your wallet is sync'ed before panicking Chances are everything is OK, you just didn't download the block containing your transaction yet...
A bit of a sidetrack here but when you say the bearer of private keys can reverse a transaction, you only really mean that he can send back the amount, right?
On the irreversible nature of bitcoin transaction, is this theoretically impossible?
Well, the receiver can basically use his own unspent inputs and generate a transaction of equal amount of BTC as an output... It's not really sending the same coins back, altough he can use the wrongfully received input as an output, there is no real need to do it this way. A transaction is indeed irreversible, altough you might want to read up on RBF, also, you could potentially double spend the input of the transaction as long as it isn't confirmed. In this case, only one of the two transactions sharing the same input will end up in a block, the other one will be forgotten/cancelled... theoretically, the transaction with the largest fee will have the most chance of getting into a block. This isn't reversing a transaction, but i guess it's the closest you can get without owning a large chunk of the network's hashrate. |
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...if I sent the funds to the wrong address(my first transaction) can the person then access my coinbase account for future transactions when I have substantially more bitcoin in the future on there?...
No, he can't. It even requires some effort for him to figure out where those BTC came from in the first place. The most he can figure out is that the BTC came from Coinbase, nothing else. BTW, how did you get the receiving address for the first transaction? Wasn't it from your own Core wallet? Yeah all I did was select receive funds on Core, typed in the amount that I bought on coinbase; got the address it created and pasted that into the sending information on Coinbase. When I open up Bitcoin Core it still says I have 0.00000000000 BTC pending and available. are you sure your core is fully synced? Could you post the transaction id? |
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Is it better to pre-generate these addresses or dynamically generate them for each user?
I know basics of how the wallets generate multiple addresses through X-public key. I need to generate around 5000 keys.
can i bind or implement this process with Trezor? you should be able to export the xpub from your trezor, the xpub can be used to generate derived keys/address either in realtime or beforehand. |
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Here you go: https://bitcointalk.org/index.php?topic=24268.msg304195#msg304195There are exactly 2^160 possible addresses as long as we keep using RIPE-MD160.
2^160 is 1,461,501,637,330,902,918,203,684,832,716,283,019,655,932,542,976.
You won't be able to generate all those addresses, even if you had the largest botnet on earth and you generated addresses nonstop for dozens of years (did not do the actual calculations tough). |
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i think it depends on the amount you are transferring if it's a couple bucks even 0.00005 could do the trick and if it's from 15 to 35mbtc you could go with 0.00009 more then that recommand it fee is the best because it's much larger amount and it will be a risk skimming from it
This has been discussed before, it's not the amount of BTC (or its value in USD) that defines the optimal fee, it's the physical size of the transaction (in bytes). This size is determined by the number of inputs and outputs that were used/generated by your transaction. It does not matter if you used 10 10 BTC inputs, or 10 0.00001 BTC inputs, on average, the size will be the same because 10 inputs were used (on average, and when you have the same amount of outputs). This being said: I often try to cheap out on the fees when i transfer funds between my own wallets... When sending to a thirth party, i usually use a little more than the recommended fee of https://bitcoinfees.21.co |
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To be honest the exact price of my electricity isn't $0.032/kWh, we have like consumption ranges with different prices, for example if I consume 2793 kWh in a trimester (we pay every 3 months), the price is calculated like this : The first 125 kWh are for $0,01/kWh + The second 125 kWh are for $0,024/kWh + 750 kWh are for $0,028/kWh + The last remaining 1793 kWh are for $0,032/kWh So basically if I would run one antminer S7, the electricity would cost me around $100/trimester. I know that with a S9 it would be more profitable, but as it's my really first time in mining I want to try first with small hardware. I've came across some listings on AliExpress especially this one https://www.aliexpress.com/item/Bitcoin-Miner-Antminer-S7-4-73TH-Asic-Miner-4730GH-Newest-Btc-Miner-Better-Than-Antminer/32611434906.htmlIf you guys can tell me what do you think about it, I think I'll order this one because he offer a 1600W PSU with the miner and the shipping is for free ( and the vendor have 94.5% Positive feedback and they have been on aliexpress for 3 years.) but if you have better choices for me please let me know  I don't know this seller, but if i remember correctly, i've seen S7's on this forum going for around $400 (in BTC). Given that the shipping is free, and you get a PSU, it might be a reasonable deal. Don't forget: maybe the shipping is free, the customs charges might actually cost rather much. I know in some countries, those charges go up to 50€ + 20% (or even more) |
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I've written a small python script to derive addresses for a user on this forum in the past: https://bitcointalk.org/index.php?topic=1682523.msg17028536#msg17028536Since he payed me a bounty when i PM'ed him the final version, i cannot give you the final result (we didn't discuss if the script was free for the public, or private), but the theory on how to do this easily is all on this page If you use this script, and run into any troubles, let me know, i'll keep an eye on this thread |
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i'm pretty happy with soyoustart servers, about 35€/month, 16 extra ip addresses included for a onetime setup fee of about €2.5/address.
I've also used delimitervps in the past, but i didn't really like their support, nor the prices for their addon ip's
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Thank you for your answer, $420 for all the setup is just impossible in my case  just the shipping price will cost me like $100... But why would you want to break in less than 6 months? I have read that the Antiminer S7 have 5 years lifetime, is this true or just bullshit? also I wanted to know what is the importance of the batch number when buying a miner. I must confess that i haven't mined in a long time (my electricity rate is really, really, high, so i turned off my gear a long time ago), so i don't have any S7's... But from what i've read over time, is that the S7 is a more reliable than the S9, but not as reliable as some other models/brands. That being said, i would always want to break even in 6 months because: - there is always a chance the gear will break, and since bitmain only offers 90 days guarantee, you'll never see your investment again
- the price fluctuates
- the diff fluctuates
- your luck might fluctuate
- the blocks will halve from BTC12.5 to BTC6.25 in 2020
All these factors, coupled with the fact that i'm not a risk takes, would result in a maximum of $420 if i would be in your case. Offcourse, if you're willing to take a risk, you could potentially go for longer break even period... The batches are important because bitmain tends to have significant differences between batches... Speed, power consumption, lifetime might vary greatly between two batches. |
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Hello, I'm thinking on taking some Antminer S7 and start mining but I'm wondering if it'll be profitable with a $0,032/kWh electricity ?
http://www.coinwarz.com/calculators/bitcoin-mining-calculator/?h=4860&p=1210&pc=0,032&pf=0.00&d=317688400354.03400000&r=12.50000000&er=900.57000000&hc=0.00Long story short, at current diff, price and block reward, you'd make about 100 bucks a month. Now, you can see which risk you're willing to take... see how much an S7 + PSU + air conditioning + shelves + tax + shipping would cost you, divide it by 100 and see how long it'll take you to break even. Do realise the price is dropping, the diff might rise, the block reward will halve in a couple of years,... I'd personally guesstimate i'd make $70/month instead of $100 to incorporate the risks, and i'd personally want to break even in less than 6 months... So, personally , i would only undertake this endaveour if my total purchase and setup costs were lower than ~ 6 * 70 = $420... but then again, i'm not really a risktaker |
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Oh and another thing Maco when i logged onto electrum it did not connect so i choose another network do you think this has anything to do with it? cheers.
Kenny
Hi Kenny, Some electrum servers are not 100% sync'ed (lagging), some prune their database to only contain the last 100-1000-.... tx's per address. If you connect to a lagging server, or if your address contains to much records, electrum might not show the correct BTC saldo. However, this does not mean the funds are lost, your current server's database is just incomplete. However, after reading your PM, i'm convinced that in your case, it was actually hacking/spyware/malware, since the inputs to your wallet were actually spent. |
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Hi Maco not quite sure what you just said in your reply! is there any chance we could communicate in private? i have seen a screen shoot similar to my wallet and the commentators have said the bc are not stolen it is just a case of pruning (whatever that is).
I downloaded electrum yesterday and sent my bc from multibit hd latest version (it was showing my bc as unconfirmed - so i downloaded an earlier version of multibit hd 0.03 and all my bc were confirmed in it) to it. All appeared in the electrum wallet.
I did a clean install of windows (thinking there may be issues) last night and this morning. After the install i opened up electrum this afternoon at 2:35pm and saw what looks like 2 individual payments (2:17pm) at exactly the same time emptying all my bc. If you can help i will be so grateful. Cheers
Kenny
Usually, if there arent privacy concerns, it might be easyer to get help publicly. If there are privacy concerns, it migt be best to send me the receiving address in pm and ill have a look tomorrow morning. |
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Is anyone willing to advise me privately about possible stolen BC after installing electrum yesterday. While i was offline today they seem to have vanished. I am desperate and i am a real person.
Cheers Kenny
You're either connected to an outdated server (or not connected at all), or your pc might be infected. Can you check your balance using a block explorer (like blockchain.info). If the first addresses used to have unspent inputs, but have a zero balance on an explorer: you were hacked. Clean you pc (reinstall), and make sure you never use the hacked wallet ever again. If the explorer doesnt show 0 balance, just try a different electrum server. |
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While an attacker with access to your Cloudflare account would not gain access to your servers, there are other ways he could do lots of harm. For example, by rerouting your traffic to his own site, he could potentially steal their credentials and any deposits they make during that time.
I was thinking the same thing: if an attacker gained acces to your cloudflare account, he could change your complete DNS records... Usually, you buy a domain at your registrar, and you point the nameserver to cloudflare's nameservers. Within the cloudflare dns records, you specify the ip of your server... An attacker can rip the whole site design, host it on his own server, change your ip by his ip in the cloudflare menu, and your visitors would be entering their username/passwords on the attacker's server without ever being able to realise this. So the attacker could do all kinds of harm (like stealing usernames, passwords, redirecting to porn, popups, harvesting emails,...) |
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i'm not really a gambler, but i can only say for me: bonuses do work (in my case).
I've only joined coinbet24 because they had a 100% first deposit bonus (iirc). Ofcourse, after the rollover, i made nearly nothing.
Same thing happened with a second online casino...
Offcourse, after the initial 100% first deposit bonus was played, i never visited either casino again... But at least for me, those bonusses made me sign up and try the casino.
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I'm currently developing a script for an anonymous buyer, i'm going to use the sendmany rpc request, a cronjob that runs one time a week, cumulating the claims and only paying out everybody that has a balance over x... That way i can send the payments in bulk, the total size of the transaction should be a lot smaller than the combined size of the seperate transactions.
The first time we might even try a couple of manual payments, just to make sure everything works:
./xxx-cli sendmany "My account" '{"address1":0.01, "address2":0.5, "address3":1, "address4":0.005}'
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I have solar panels that I planned on using for power, I have an empty and unused clothing closet with 3 shelves in it, off in a corner of my house, I have no past mining experience, if there is somewhere easier to start I will gladly try that if this is too hard for me. I live in the US and i am not sure where this item would ship from, and is a PSU a power supply? And if that is what it is can I purchase that? If it is something else please let me know.
If an S9 is a better deal than I might go with that, I just saw the S7 on an article and it said that it was decent.
What other methods are there that I can try to use
I am here to learn whatever I can, if there is an article or two that you think I should read just send a link or name it and I'll look it up and read it so that I can have some knowledge about this.
Be carefull there... It looks like you have half a plan, don't do this without having a full plan and after examining everything that could potentially go wrong. I've never understood people that are really into solar mining. I have solar panels at home to, but after a deduct the initial price, and the extra taxation my governement issues on solar panel owners, the power is cheaper, but certainly not free... Maybe that differs from country to country, but you will have to agree solar panels are rather expensive, and you'll need to use power from the grid to mine at night, or you'll need to invest in battries. You can use http://www.coinwarz.com/calculators/bitcoin-mining-calculator to calculate if you can make a profit with your power and any ASIC you buy, but keep in mind it calculates the current profit. When prices drop, diff increases or blocks halve, your profit goes down. To answer the rest of your questions: - a PSU is a power supply, plenty of topics on this forum that discuss this - shipping costs and import duty depends on where you live and where the sender lives. bitmain is chinese, both transport and import will be expensive. But maybe you can buy one second hand, or from a local reseller? - an S9 has a much better power/hash ratio (it can deliver far more hashes per Kwu), but it's harder to get them second hand - shelves in a closed clauset might not be an ideal place to store S7/S9's... What about the heat, what about the noise, how will you get power there? |
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I used to run one on a container on my dedicated machine. I stopped because running an electrum server was actually rather resource intensive, and i needed those resources for other things.
IIRC, you needed the full blockchain sync'ed and indexed (txindex=1), you also needed to download (or generate) a leveldb db for electrum. The total size of the bitcoind + electrum db was about ~150 Gb IIRC.
I ran it on a container, first i allocated 4 Gb RAM and 2 Vcpu's, but i upgraded the container to 8Gb pretty soon, and the performance still wasn't that great.
I'm pretty sure nowadays, you'll need at least 16, preferable 32 Gb of RAM, an SSD and 4 vCPU's to run everything smoothly. This wouldn't be a real problem, but you get no tips and no recognition to run an electrum server (at least, i didn't get a single thank you, nor a single tip)
For how long you was running the servers ? I sometimes check the addresses that I see in the messages on the console tab and I found that some people sent funds there , I know It's nothing much but well... and approximately , how much you think It would cost me ? I'm not going to run it from my home or anything , I will be buying them online (probably buying monthly). I've ran a server for a couple of months. The cost, rather hard to say since VPS prices differ so much... You'll need an 8Gb VPS with 200 Gb SSD and at least 2 vCPU's. I guess it won't come that cheap. Seems cool... I'm going to check it out next time i have some spare server resources |
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i use blockchain
but i active sms code for entering to my wallet
is it possible that he have my backup wallet?
I'm not really familiar with the use of blockchain.info's wallet, but if you mean that the SMS is used as a 2fa, you're probably right: somebody might have gotten their hands on your backup wallet. This means that some place you used to store your backup was compromised... Either your PC, but it might also be your cloud storage (in case you used cloud storage to store your backup) |
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