I seriously believe that the OP will lose his sale if he charges these prices.
Profit margins for bitcoin mining are really thin, adding a couple thousand bucks on top of the setup costs will scare any client away as long as he did the effort to crunch the numbers.

Don't get me wrong, there's nothing wrong with charging $1000-$1500/day. If you'd ask me to setup a complete SAP environment in your company, that's the rate i'd charge to, but i seriously don't believe such a rate would work in the mining industry, especially not on such a small scale (~10 miners)

EDIT: Please read DannyHamilton's post (right beneith this one). Seems like my info is a bit on the old side (you learn something new every day )


You can't really calculate it, but you can make an estimation this way:

in*180 + out*34 + 10 plus or minus 'in'*

* source: http://bitcoin.stackexchange.com/questions/1195/how-to-calculate-transaction-size-before-sending

This is valid for "standard" P2PKH transactions. Offcourse, it's still an estimation.

For example, a transaction with one input and two outputs (one output to the receiver, one output to your change address):

1*180+2*34+10 +/-1 = estimated size between 257 and 259 bytes.
https://bitcoinfees.21.co/ tells us that at time of writing 140 satoshi's per byte will give you a 90% chance of getting into one of the next 3 blocks.
Personally, i don't mind waiting 3 hours, so i'd go for a 61-80 satoshi/byte fee... 259 * 61 =~ a 0.00016 BTC fee would probably be enough if you don't mind waiting for a couple of hours.

See my first post
wait untill the majority of the nodes dropped your tx from their mempool => rescan, repair, ... your wallet (IIRC, this is not needed for electrum) => re-use the unspent output that you used as an input for this transaction to re-create the transaction.
Re-using the same input in electrum is pretty easy, altough it seems the procedure has changed recently... For the latest version (2.7.18):

• open your wallet
• if you don't see a coins-tab, go to wallet=>coins
• go to the coins-tab
• press shift, select all unspent inputs that were used for your "hanging" transaction
• right-click => spend
• make sure you have tools => preferences => fees => edit fees manually and enable replace-by-fee checked!!!
• fill in the correct receiving address, and the correct fee
• send

For previous versions (don't know when the procedure changed exaclty):

• open your wallet
• if you don't see a addresses-tab, press Ctrl-A
• go to the addresses-tab
• use shift to select all addresses whos unspent inputs were used
• right-click => send from
• manually remove all inputs that were not used in the hanging transaction
• fill in the correct receiving address, and the correct fee
• send

If you want a sollution right now, there's alway the option of exporting your private keys (dangerous!!!) and double spending the unspent inputs in a transaction with a higher fee

• open your wallet
• wallet=>private keys=>export
• fill in your password

Now, there are several ways to proceed... For example using bitcoin core to import the private keys and create a new transaction here... This is rather difficult, so i prefer to download the sourcecode of coinb.in, open the downloaded coinb.in website, go to new => transaction, entering my address, go to the inputs-tab, remove the inputs that are not needed, go to the outputs-tab, enter the address and how much outputs you want to generate to this address (leave some room for the fee), submit, copy hex, reboot without network, go to the sign-tab, past private key + hex, sign, save hex, reboot, go back online, open coinb.in, go to broadcast tab, paste signed transaction hex, broadcast

EDIT: it seems you transaction was confirmed this procedure will no longer work since the unspent outputs are now gone from the UTXO, so they can no longer be used to generate a new transaction that will not be rejected by the network.

• transaction size: 2883 bytes
• transaction fee: 144505 satoshi's
• fee (in satoshi's/byte) : 50 satoshi's/byte
• fee to have 90% chance of getting in the next couple of blocks: 140 satoshi's/byte* (at time of writing)
• estimated maximum time of waiting to have a 90% chance of getting into a block with your fee if everything else stays status-quo: 7 more hours*.

* https://bitcoinfees.21.co/

Long story short: i'm sorry, but no, you didn't add sufficient fees!
For this transaction to have a 90% chance of getting added in one of the 3 next blocks, you should have added:
2883 bytes * 140 satoshi's per byte = 403620 satoshi's =~ 0.004 BTC, or 0.0041 just to be sure.

The size of the transaction has absolutely nothing to do with the amount of BTC you're sending, and everything to do with the number of inputs used for the transaction and the number of outputs generated by the transaction.

Your transaction has 19 inputs and 2 outputs, so it's big... If you would have sent 1000BTC using one input and creating one output, the transaction would have been small, and your fee would have been more than enough.

You have exactly the same options as the OP of this thread, i listed them all in the first post i made in this thread.

• transaction size: 191 bytes
• transaction fee: 9600 satoshi's
• fee (in satoshi's/byte) : 50 satoshi's/byte
• fee to have 90% chance of getting in the next couple of blocks: 140 satoshi's/byte* (at time of writing)
• estimated maximum time of waiting to have a 90% chance of getting into a block with your fee if everything else stays status-quo: 7 more hours*.

* https://bitcoinfees.21.co/

your options:
1) using https://www.viabtc.com/tools/txaccelerator/ and hope they still have some space in their next block for your transaction
2) wait untill the majority of the nodes dropped your tx from their mempool => rescan, repair, ... your wallet (if this is necessary, it depends on the specific wallet software you used) => re-use the unspent output that you used as an input for this transaction to re-create the transaction
3) contact quickseller or macbook-air, offer a decent reward for adding your tx to the block their pool is currently working on
4) depending on your wallet and the way you created the tx, you can maybe use RBF
5) if you controll one of the receiving addresses (change addresses are fine), you can do a CPFP
6) depending on your technical skills, you can double spend the input for this transaction, as long as the "hanging" transaction is unconfirmed. If you use bitcoin core, you can also start with -zapwallettxes or use abandontransaction from the console

I know it's a little bit to late, but next time, don't cheap out on the fee

I have 2 Antminer U2's, a geccoscience compaq and a Gridseed 5-chip GC3355 ASIC gathering dust.. And i'm from europe.
The gear hasn't been turned on in a really, really long time, but it was working last time i used it.

Also, the gridseed doesn't have a fan (passive cooling only), no PSU, no usbcord and i've only used it to mine LTC, so i never tested out the sha256d hashing (cause it was wildly ineffective at hashing sha256d even when it was relatively new).

Also, i think i still have the original case of the geccoscience, but the U2's cases are long gone, as is the gridseed's original packaging.

I can sell you some of this gear if you want to, just don't expect to ROI

I have written a python script to do this, but you need to realise there are infinity keys that can be derived from a seed...

https://bitcointalk.org/index.php?topic=1682523.msg17027986#msg17027986

It's a starting point, the completed script was only sent to the OP of that thread in PM, and since he payed a bounty, i'm not sure if i can publish the complete works... That being said, this post should be more than enough to put you in the right direction, even without much scripting experience.

But TBH, if you're really that paranoid about any wallet, the only completely trustless scenario for somebody that is not able to verify and compile the sourcecode himself, is to use an offline wallet setup (install electrum on a pc that never goes online, export the xpub, save it on an usb stick, transfer it to an online pc, import the xpub, generate transactions on the online pc, transfer them on an usb stick to the offline pc for signing, and back to the online machine for broadcasting).
I'd personally also suggest to use a decent, tested, program to generate your seed words (i recommend electrum, altough you seem to have trust issues ), not only because a random seed is not allowed, but also because humans are a bad source of entropy.
This is not an easy setup, IIRC you need to start the offline electrum using a couple extra parameters, but it should be as close to completely paranoid as possible... Maybe with the exception of a paper wallet.

And the mining room: Are the electricity cables suitable for 15Kw power draw? the outlets OK? The breakers? Are there shelves? Is there sufficient natural cooling, or do you need to calculate the cooling?
OR... Does the client have a serverroom that is equiped for this much extra HW? In that case you're all set.

If it's just figuring out where you'll have to buy which miners, unpacking them, plugging them in (including PSU and/or controllers if necessary), configuring them and doing the network setup, i guess i'd personally charge 7-8 hours.
If you need to setup the environment, it depends on which tasks you have to do...

Also, it depends on your client... Some people will listen to you, ask a couple of questions, agree with your plans and let you execute everything. Other people will keep on asking extra questions, doing their own 'research', keep discussing changes,...

I'd personally keep on charging $30-$35/hour for maintenance whenever the need occurs.

Proof the system works 
Your transaction was included in this block: https://blockchain.info/block-index/1454526
This block was mined by ViaBTC

OK, i've given this explanation before, but here we go again:

The way this usually works:
you create a transaction, using your wallet of choice (altough i strongly discourage the use of online wallets, even such a wallet will work).
The wallet will use unspent inputs to addresses it manages to create the transaction, and broadcast this transaction to the network.
This broadcasted transaction will go to the mempool of the nodes, where it will stay untill it gets added to a block or untill the node decides to drop the transaction (each node can have his own configuration, and the mempool is cleared when the node is restarted to).

On average, one block gets mined every ~10 minutes, one block has a fixed maximum size of 1 Mb. Since the transaction also has a physical size that depends on the amount of inputs that are used by the transaction and the number of outputs that are generated by the transaction, only a limited amount of transactions will physically fit into a block.

A "minimal" transaction (altough this does not exist) of one input and two outputs might have a size of ~225 bytes. This means that only about 4000 transactions will fit into a block, given that all transactions are really small and the block is completely filled. In reality, most full blocks seem to contain about ~2000 tx's (i didn't create statistics for this, i found this number just by looking at the last couple of blocks).

A miner can chose which unconfirmed transactions he will add to the block he's currently working on, but since he wants to optimize his income, it's wise of him to add the transactions that have the highest fee per byte of transaction data.

At the moment https://btc.com/stats/unconfirmed-tx shows me that there are about 50Mb of transactions into the mempool of btc.com's node.

So, to go back to your original question: if you want your transaction to be added to a block, it might be a good idear to:
1) calculate your transaction size => (in*180 + out*34 + 10) for a P2PKH ("normal") transaction
2) look up a good fee per byte on https://bitcoinfees.21.co/ (160 satoshi's per byte a the time of writing)
3) multiply the size by the optimal fee, round up and add this fee to your transaction

This way, you have a 90% chance of getting added to one of the next couple of blocks

EDIT: DannyHamilton pointed out that my information on how to estimate transaction sizes is outdated,using inputs from a compressed address only accounts for ~149 bytes instead of 180.
link

If the tx has a fee > 10 satoshi's per byte, you can use this tool: https://www.viabtc.com/tools/txaccelerator/

your tx is    226 bytes and has a fee of 14690 satoshi's = 65 satoshi's per byte, so viaBTC can help you!

PS: this is not a magical tool... It's just a way of asking the ViaBTC mining pool to add your unconfirmed transaction to the  block they're currently working on.
If they get to many requests, they might add you to a queu (i don't know), if they don't find a block for 4 hours, you'll have to wait untill they mine said block,...

Yes, you're worrying to much, ThomasV is a standup member of the community, and i seriously doubt he'd even attempt to sneek in a backdoor. Even if he would ever do such a thing (which i seriously doubt!!!), the sourcecode is open source, so i assume the backdoor would have been found by now.

If you're really, really, really, afraid of everything and everyone, you can always generate your own seed and use this in electrum.
You can use the seed to generate the xprv and xpub, and use online or offline tools to verify if the addresses generated by your own seed match the addresses generated by electrum

You're free to read the sourcecode yourself, and compile the wallet using the sourcecode you manually verified.

https://github.com/spesmilo/electrum

Personally, i've used electrum for a long time, never had problems with it...

I personally don't think there's enough info in the OP to tell us a real number.
What needs to be done exactly?

- will you be asked to help giving purchase advice? Calculate ROI, look for PSU's, shelves, cooling,... Or is is just installing gear that has been bought by your customer?
- will you be asked to calculate the mining room's wiring, breakers,...
- will you only be giving advice, or will you physically help to setup shelves, install A/C,...

I'd personally see what would be asked of me, try to calculate the amount of time i'd spend on the project, and multiply it with a reasonable rate (about $30-$35/hour in my country for such a specific job). Like it has been said before: maybe you'll work for a lot less (depending on your country, and the fact if this is a continuous or a one-time job).

For example:
- finding out which miners to buy, factoring in the electricity rate, custom fees, shipping and handling, PSU's, looking for second hand miners,... About 2-3 hours???
- looking at the cabling, breakers, calculating the btu's for correct A/C... About 2-3 hours???
- setting up the room: impossible to say (does the room need to be cleared, does it need A/C, is the wiring OK, how about security,...)
- ...

https://bitcointalk.org/index.php?topic=50037.580

Their official topic.
The last pages seem to be filled with people that claim to have been scammed by bitcoin fog.

Im sorry to bring you the bad news...

This transaction has about 400 confirmation, like you already mentioned.

The receiving address seems to be p2sh (starting with a 3).
Did you generate it yourself or is this a deposit address for some service?

I just guess there's a big chance an online service generated this address for you, if im correct it might be wise to contact their support. If you used a desktop wallet, would you mind telling us which one?

Can you post the tx id?
If it has 400 confirmations, something else must be wrong...

This is the first time i see somebody claiming you can use an asic as a motor. I don't really believe this. Please provide proof.

I've seen other people claiming they could use asics to solve math problems. I dont believe that either (afaik, asic can only be used fror generating sha256d hashes, don't see a lot of math problems needing such a feature). Please provide proof.

Antwoord op vraag 1=> Nee, een privésleutel (private key) is geen identifier, noch een address. Het gaat hier eigenlijk over de basis van bitcoin, het zou me wel heel ver brengen om dit volledig gaan uit te leggen, maar je privésleutel is eigenlijk exact wat de naam zegt: een sleutel die je privé moet houden. Eigenlijk zou je je eigen privésleutels moeten aanmaken en beheren, met je privésleutel kan je je publieke sleutel en je adres aanmaken. Je privésleutel gebruik je (onder andere) voor het ondertekenen van transacties. Als je privésleutel door derden gekend is (bijvoorbeeld door hacking, of door een web wallet te gebruiken), kunnen derden transacties in jouw naam gaan ondertekenen, en kunnen ze je bestelen.
PS: je eigen privésleutels aanmaken en beheren doe je best met een goeie portemonnee (wallet). Theoretisch gezien zou iemand met voldoende tijd en wiskundige kennis dit ook volledig met de hand kunnen doen (eventueel zelfs gewoon op papier), maar een normaal persoon gebruikt de juiste software

Antwoord op vraag 2=> Met prullen bedoel ik: als jij een transactie maakt, en deze ondertekend met je privésleutel en daarna doorstuurd naar het netwerk, kan de eerste ontvanger van je transactie hier theoretisch gezien vanalles aan gaan veranderen vooraleer hij de transactie gaat doorsturen (bijvoorbeeld de ontvanger veranderen naar hun eigen adres). Als ze dit zouden doen, veranderd de tekst van de transactie, en zal de handtekening die jij met je privésleutel gemaakt hebt niet meer kloppen. Iedereen zal dus zien dat de transactie veranderd werd door iemand die de privésleutel niet had, en de transactie zal verworpen worden.

Antwoord op vraag 3=> Niet persé... Een cleane computer met een lokale wallet (core, electrum, multibit HD,...) is goed genoeg. Als je computer echter gehacked word, kunnen je coins nog altijd gestolen worden. Om dit tegen te gaan zijn er methodes zoals een hardware wallet, een paper wallet of een offline computer gebruiken om transacties te tekenen.

The OP made a site on TOR, it can't be accessed without using the onion router, unless you use an onion proxy on the clearweb.
https://hackerw6dcplg3ej.onion.to/