Need large amount of testnet bitcoin, can someone help me?

[a040900]

I would appreciate any contribution but the experiment will take almost 50 testnet BTC.
It will obviously not be destroying those coins so if you would like I could return it to you or to a faucet of your choice.

The address is mk8NxMJEPE8F1K2o9Z3QzJLQbnPHdML9mn. Let me know if you've any questions.

Thank you.

[1714935104]

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[Dabs]

What would you need 50 testnet coins for, that 0.50 or 0.05, or 0.005 will not suffice? I don't have that much either, but you can always get from the many faucets a small amount. It's for testing, the amount should not matter.

But I'd like to also know if there are any other ways of acquiring such amount of testnet coins other than mining them.

[mocacinno]

What would you need 50 testnet coins for, that 0.50 or 0.05, or 0.005 will not suffice? I don't have that much either, but you can always get from the many faucets a small amount. It's for testing, the amount should not matter.

But I'd like to also know if there are any other ways of acquiring such amount of testnet coins other than mining them.

Nope, you either run in regtest mode, or you mine tBTC...

Sometimes 0.5 tBTC does not suffice, for example: if you're designing a mixer... You'll need a lot of tBTC in order to do a proper taint analysis.

@OP: I run a faucet: https://tbtc.mocacinno.com and i've given tBTC as a loan in the past. I have > 50 tBTC (but most are on my hardware wallet at home, so i can't access them for another 3 hours)
However : since you're a newbie, i would require sufficient collateral for such a loan. The collateral should be sufficient to rent hashrate from miningrigrentals and mine >50 tBTC in case your run off.
To tell you the truth, the diff on the testnet is still very high and the block reward is ~0.39 tBTC, so i'm afraid it'll be a lot of collateral to loan 50 tBTC.

IF you're interested: i'm willing to use a trusted forum escrow to hold the collateral, no intrest, but ALL fees are payed by you (including the fees to transfer the collateral to me or the escrow, and the fees to transfer the collateral back to you). Please do not PM me, but post anything on this very thread... I don't like to hide in PM's, telegram, mails,...

[ethtrader16]

I would appreciate any contribution but the experiment will take almost 50 testnet BTC.
It will obviously not be destroying those coins so if you would like I could return it to you or to a faucet of your choice.

The address is mk8NxMJEPE8F1K2o9Z3QzJLQbnPHdML9mn. Let me know if you've any questions.

Thank you.

What and why you are going to mine? And why you are asking to people to donate something to you? What are the benefits if I am going to do this?

[Dabs]

testnet BTC are not supposed to have any value ... ... but ... yeah.

[mocacinno]

testnet BTC are not supposed to have any value ... ... but ... yeah.

That's true, they don't have any value... But that doesn't mean you can mine them for free anymore...

I would give a tBTC loan to anybody who wants one, but for people i don't know i still request collateral so i get the tBTC back and i don't have to rent hashrate to mine new tBTC for my faucet out of my own pocket.

I know it kind of defeats the purpose, and i really wonder why there are people that insist on pushing the difficulty on the testnet so incredibly high by mining on the testnet with relatively new ASIC's... I'd love to mine on the testnet with my cpu, but if i did this i'd mine close to nothing  

I did a VERY raw calculation, based on prices i found on miningrigrentals:
You can rent an S9 with 16,5 Th hashrate for  0.00002/hour.
The diff is 10.5M
The block reward is 0.39 tBTC

So, if you run this S9 for a full day, it would mine:
 (((((16500000000000 * 0.39 * 600 * 65535) / 2^48) / 10500000) * 6 * 24) = 12.3 tBTC/day

A day of mining with this rented S9 would cost 0.00002 * 24 = 0.00048

So, mining 1 tBTC with rented hashrate would cost ~0.00004 BTC, NOT including the transaction fees, not including the fact that you'd end up with change on miningrigrentals, not including the time i'd need to setup everything, not paying for my efforts, not including the odds that i'm unlucky and hit less blocks than average,...

[Dabs]

I understand completely. I wonder why the block reward is so small though, shouldn't it match mainnet, more or less.

This just means there are people mining something worthless. Or, mining not for profit, since one does not sell testnet coins.

It's much "cheaper" to just run the faucets every day to get more coins than you can mining with a single S9. That's so strange to me, but I wouldn't know, I don't hang around the testnet often. I have some on a Lightning wallet, but I also got those from a faucet. So I "test" them by buying starblocks or something like that.

Seriously, what could the rational be for the mining difficulty to be so high, or does it simply not cost some rich miner to unleash a few machines on the testnet ... maybe they are old equipment running on solar or something.

[HeRetiK]

I understand completely. I wonder why the block reward is so small though, shouldn't it match mainnet, more or less.

I don't follow Bitcoin's testnet closely, but I assume it's because the difficulty drops back to 1 whenever no block has been found for 20 minutes [1]? At least that would explain testnet's block height of beyond 1.6M [2] which means it already went through 7 halvings which would correspond with the block subsidy mocacinno mentioned.

[1] https://en.bitcoin.it/wiki/Testnet
[2] https://live.blockcypher.com/btc-testnet/

[hulla]

testnet BTC are not supposed to have any value ... ... but ... yeah.

That's true, they don't have any value... But that doesn't mean you can mine them for free anymore...

I would give a tBTC loan to anybody who wants one, but for people i don't know i still request collateral so i get the tBTC back and i don't have to rent hashrate to mine new tBTC for my faucet out of my own pocket.

Wait i dont get it. I thought there are some online site which is even mention on bitcoin.org site and on this forum for getting the testnet bitcoin for free, i mean site like
https://tpfaucet.appspot.com/
https://bitcointalk.org/index.php?topic=950331.0

Are the site not working again?

[NeuroticFish]

Wait i dont get it. I thought there are some online site which is even mention on bitcoin.org site and on this forum for getting the testnet bitcoin for free, i mean site like
https://tpfaucet.appspot.com/
https://bitcointalk.org/index.php?topic=950331.0

Are the site not working again?

There are indeed a couple of working testnet faucets. (I used to google for them.) But the amounts they give are usually small. You'll need a huge effort to gather big amounts like the 50 tBTC OP was asking.
I find mocacinno's offer reasonable. Basically OP would only lose the tx fees for the collateral, since he will return the loaned tBTC (and if any tBTC is lost for fees, that can be recovered from faucets).

[mocacinno]

--snip--
I don't follow Bitcoin's testnet closely, but I assume it's because the difficulty drops back to 1 whenever no block has been found for 20 minutes [1]? At least that would explain testnet's block height of beyond 1.6M [2] which means it already went through 7 halvings which would correspond with the block subsidy mocacinno mentioned.

[1] https://en.bitcoin.it/wiki/Testnet
[2] https://live.blockcypher.com/btc-testnet/

^^ This ^^ is correct

It's a tad bit more elaborate tough...
If a block hasn't been found for 20 minutes, the diff indeed drops to 1.

Now, let's assume we've just had a diff adjustment at height x
at height x + 1980, the guy running a couple of ASIC's on the testnet decides to turn them off, block @ height x + 1981 isn't found for 20 minutes (diff = 1), block @ height x + 1982 idem...

Now, when we finally arrivate at x + 2016, the average time between 2 blocks > 10 min and the current diff is 1....
Sooooo... At the retarget, the diff will once again be 1 (the minimum), but it'll stay 1 for the next 2016 blocks.
After another 2016 blocks, the average time between 2 blocks is just mere seconds, so the diff is adjusted to 2.
After another 2016 blocks, the average time between 2 blocks is just mere seconds, so the diff is adjusted to 4.
After another 2016 blocks, the average time between 2 blocks is just mere seconds, so the diff is adjusted to 8.

Sooo, in this case, if the ASIC guy turned his ASIC's off @ height x + 1982, and turned them back on @ x + 2017, he'd be able to mine thousands and thousands of blocks in MINUTES... It would take a ton of retargets before the diff was adjusted to a height that would bring the average time between 2 blocks to ~10 minutes.

However, since he's the ASIC guy, he'd still be able to mine most of the blocks compared to a CPU miner.

Let's say the ASIC miner only has 5 Th of hashrate, while a cpu miner has 5 Mh => the ASIC guy produces a whopping 1000000 times more hashes per second than the CPU guy, so the odds of him finding a block at diff 1 is 1.000.000 times higher... Offcourse, at this point, things like other factors come into play (network speed, network hashrate, which nodes you're connected to, time needed to verify a block, IO ,...) but still...

[Dabs]

Soooo.... to get a lot of testnet coins, just run a bunch of asics, or wait for diff to drop to 1 and then run the asics. But that's what everyone with an ASIC miner will do. I guess just keep it on for awhile, eventually you'll get at least a few blocks in when difficulty drops to 1.

You'd need to rent hashrate for a much longer time period if you don't own the mining hardware, whereas anyone with previous generation miners would be able to get something in.

7 halvings ... maybe testnet should be reset again and block rewards not get half, .. or maybe .. well, then how do we test the future, LOL.. id' like to see what happens in testnet if it's like the year 2140 or something equivalent (but only people with current day hardware can mine) where block reward is just transaction fees.

Or something like after every 2 or 3 halvings, it goes back up to 50 per block.

Alternatively, one can just use an altcoin or make your own fork, since it's for testing purposes. You'll get as many whole coins as you need. But, yeah, it's an altcoin ... (go fork and make Bitcoin Test Fork ABC XYZ BSV Gold Platinum Diamond Need It for Mixing Something...)

[a040900]

What would you need 50 testnet coins for, that 0.50 or 0.05, or 0.005 will not suffice? I don't have that much either, but you can always get from the many faucets a small amount. It's for testing, the amount should not matter.

But I'd like to also know if there are any other ways of acquiring such amount of testnet coins other than mining them.

Nope, you either run in regtest mode, or you mine tBTC...

Sometimes 0.5 tBTC does not suffice, for example: if you're designing a mixer... You'll need a lot of tBTC in order to do a proper taint analysis.

@OP: I run a faucet: https://tbtc.mocacinno.com and i've given tBTC as a loan in the past. I have > 50 tBTC (but most are on my hardware wallet at home, so i can't access them for another 3 hours)
However : since you're a newbie, i would require sufficient collateral for such a loan. The collateral should be sufficient to rent hashrate from miningrigrentals and mine >50 tBTC in case your run off.
To tell you the truth, the diff on the testnet is still very high and the block reward is ~0.39 tBTC, so i'm afraid it'll be a lot of collateral to loan 50 tBTC.

IF you're interested: i'm willing to use a trusted forum escrow to hold the collateral, no intrest, but ALL fees are payed by you (including the fees to transfer the collateral to me or the escrow, and the fees to transfer the collateral back to you). Please do not PM me, but post anything on this very thread... I don't like to hide in PM's, telegram, mails,...

Hi, sorry for the late response.
I  would like to build a crypto exchange and a mixer.
And just like you say. I need enough coins to test stability.
I think I can give the collateral, but not sure what is it...
Please tell me the detail, thanks.

[mocacinno]

I'm currently on vacation for the rest of this week. On Monday I'll try to come up with a reasonable collateral estimation to cover 50 tbtc.

[posi]

Speaking of the testnet bitcoins, the wallet address posted by the OP start with "mk" not even 1. Does this mean there's a particular wallet which are use for the testnet bitcoin or every BTC wallet are good to go?

[AdolfinWolf]

Speaking of the testnet bitcoins, the wallet address posted by the OP start with "mk" not even 1. Does this mean there's a particular wallet which are use for the testnet bitcoin or every BTC wallet are good to go?

You'll need to simply run bitcoin core with testnet=1 (edit bitcoin.conf), and then it'll generate testnet adresses, (which have a different prefix.)

With electrum you also simply add --testnet as a parameter and it should start in testnet mode. (Newer versions of electrum automatically come with a shortcut for testnet, on windows at least.)

[pooya87]

Speaking of the testnet bitcoins, the wallet address posted by the OP start with "mk" not even 1. Does this mean there's a particular wallet which are use for the testnet bitcoin or every BTC wallet are good to go?

it is not "mk" it is "m" and it is the well known initial character of a testnet address equivalant to mainnet addresses that start with "1". https://en.bitcoin.it/wiki/List_of_address_prefixes
as for wallet, usually it is developers who need testnet coins to "test" their own system so most don't need a wallet and instead use their own code.

You'll need to simply run bitcoin core with testnet=1 (edit bitcoin.conf), and then it'll generate testnet adresses, (which have a different prefix.)

With electrum you also simply add --testnet as a parameter and it should start in testnet mode. (Newer versions of electrum automatically come with a shortcut for testnet, on windows at least.)

you can run core with -testnet argument through command line too.
and you can create the shortcut of both on your system by adding the argument at the end of the location of the executable. on windows right click on the shortcut and select properties. in shortcut tab there is a box called "target" which has the directory like c:\.... at the end of it you can add that argument:

Code:

"C:\Program Files (x86)\Electrum\electrum-3.3.6.exe" --testnet
[code]

[/code]

[mocacinno]

I'm currently on vacation for the rest of this week. On Monday I'll try to come up with a reasonable collateral estimation to cover 50 tbtc.

Sooo... I'm taking a raw stab at this... To be perfectly honest from the start: THIS IS NOT A SALE... In the end, my estimation will include the price for renting premium hashrate, adjusted for bad luck, including fees, including rounding margins, some beer money for my time to setup tBTC mining... If you want to have tBTC to OWN, you'd better mine it yourself. As a matter of fact, i'd be happy to give you a cost estimation to help you setup a tBTC node, p2pool and teach you how to setup an ASIC in order to mine on the testnet p2pool node, i can basically guarantee that if you want to OWN a lot of tBTC it'll be cheaper (and more honest) to do it this way.
tBTC is completely worthless, and there is no need to hoard it, the dev's can decide to reset the testnet at any time!!!

The collateral will be high, but it's exactly this: collateral... If you give me the 50 tBTC back, you'll get your collateral back (minus the transaction fees!!!).... If you decide to run, i'll keep the collateral and use it to mine more tBTC to fund my faucet, and i'll end up with some pocketchange aswell.


So here we go... Cost estimation of what it'll cost me if you decide not to repay the loan and i want to get the 50 tBTC back so my faucet doesn't run dry.

Miningrigrentals
This is the cheapest: https://www.miningrigrentals.com/rigs/151500/?currency=BTC
0.00001800 BTC/THASH/DAY * 17 Th = 0.000306 BTC/Day

The formula to estimate the daily income:
(((((Hashrate (hashes/sec) * average block reward * 600 * 65535) / 2^48) / Difficulty) * 6 * 24)

The variables
Hashrate = 17 Th = 17000000000000 Hashes/sec
average block reward = 0.39 tBTC
Difficulty = 10.5M = 10.500.000

The result
((((( 17000000000000  * 0.39  * 600 * 65535) / 2^48) / 10500000) * 6 * 24) = 12.7 tBTC/day
50 tBTC / 12.7 tBTC/day = 3.94 days =~ 4days

The time i'll need to mine 50 tBTC
getting the escrow to release the collateral: 30 minutes
Setting up p2pool on my testnet node: 1 hours
setting up miningrigrentals: 30 minutes
Total: 2 hours @ $25/hour @ 8641 $/BTC = 0.005781

The total costs
4 days of mining  @ 0.000306 BTC/day = 0.001224 BTC to rent the hashrate
I'll have to fund mininrigrentals with a tiny bit extra (10%), since it's not guaranteed that i'll get the cheapest miner: 0.0001224 BTC
Transaction cost (2 inputs, 2 outputs, 10 sat/byte: 0.0000374
Labour cost: 0.005781BTC

Grand total: 0.0071648... So 0.0072 BTC would be acceptable collateral for a 50 tBTC loan.



As said before, the terms are simple:

• 1 month time to repay the 50 tBTC, after exactly 1 month i'll use the collateral to buy hashrate from miningrigrentals, so there'll be no way to get your funds back
• i want 50 tBTC back, you can use the 6 free, working faucets to claim the fees you've spend while testing
• i accept a couple altcoins or bitcoin as collateral, collateral can be helt by a trusted forum escrow if you want to
• all fees are payed by you (escrow fees, transaction fees to move collateral,...)

[NIPILIYA]

What would you need 50 testnet coins for, that 0.50 or 0.05,  xender discord omegle or 0.005 will not suffice? I don't have that much either, but you can always get from the many faucets a small amount. It's for testing, the amount should not matter.

But I'd like to also know if there are any other ways of acquiring such amount of testnet coins other than mining them.

It will obviously not be destroying those coins so if you would like I could return it to you or to a faucet of your choice.

[BrewMaster]

I've researched a few of these Testnet bitcoin faucets... literally the best bitcoin Testnet faucet I found gives only 0.017 at a time... but I think it used to give 0.1 in the recent past... but that seems to be no more... if anyone knows a better one please share it. Thank you!!

you can contact mocacinno and see if he can help you with some larger amounts of TBTC. he also has a faucet you may visit: https://bitcointalk.org/index.php?topic=5223320.0

meanwhile there are 3 active faucets that i use whenever i want to test something and they are enough for me:
https://testnet-faucet.mempool.co/
https://bitcoinfaucet.uo1.net/
https://coinfaucet.eu/en/btc-testnet/