Correction: a block can currently contain 1MB of data. Originally, there was no limit, but at some point the 1MB limit was added to prevent DOS attacks. It was never intended to be permanent and can be increased or removed entirely if necessary (I think Gavin said the limit would be raised once pruning is implemented).
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Off-topic: How can I include a public message in a transaction??
You can't. The message isn't in the transaction, it's on blockchain.info.
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Thank you! ![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
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I wanted to know to see if I can play dota 2 with this video card!
I doubt it, and not just because actually installing the card is a prerequisite to playing games on it.
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Well they can't refuse cash so they have to accept it if that's what the customer wants to pay.
This is not true in most countries.
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It looks like a Sapphire X1550. EDIT: Actually, it might be an X1600 Pro, which I think is exactly the same card but with the RV530 GPU instead of the RV515. They're identical except for shader performance. This should go into the PCi Express slot, Usually the one with the clips that move to the side, or am I missing something
You're missing the fact that an AGP card does not even come close to fitting in a PCI-E slot. Square pegs don't go in round holes. I thought they taught that in kindergarten?
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Everybody has a price ?
True. But most people's prices are far higher than the market will allow, so for all intents and purposes, these people are incorruptible. At least until inflation hits and market prices increase to the level of these formerly incorruptible people's "asking price", as it were, at which point they'll suddenly start killing each other over the last can of soup... Best not to think about that.
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how my site will know about the Tx Id and the amount ?
The same way as if you had published your bank account number on your site for the purpose of people sending money to it. Your site has no way of knowing if anyone has sent money to that bank account. However, your bank will know, and you can get the transaction details from your bank. Likewise, your site will not know if you have received bitcoins, but your Bitcoin wallet will, and it will provide the transaction details.
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Say the node A sends something to you (B) and you relay it to C. Well, if your node wasn't leeching in the first place, A would have had room for another connection: directly to C.
Implying A actually can connect directly to C, which is not always (or even usually) the case. A and C might only be online at different times; C might be a hidden service and A can't use Tor; an evil government firewall might block connections between A and C; or any number of other scenarios may prevent A and C from connecting directly. It is simply not true that any node can always connect to any other node at any time.
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There are also "leech nodes" that arise from people running "full nodes" behind an archaic UPnP-less router that blocks the port... They waste all the resources a full node does while providing none of the benefit.
False. Please elaborate. Nothing in your post is even remotely true. Therefore, it is false. If you have any reason for believing anything in your post to be true, please provide such reasons.
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Many (most?) of these are likely to be spammers whose posts have been deleted.
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There are also "leech nodes" that arise from people running "full nodes" behind an archaic UPnP-less router that blocks the port... They waste all the resources a full node does while providing none of the benefit.
False.
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Thanks a lot for the replies. I think I've managed to figure it out how to do what I want with something called binary options.
You should realise that binary options are not true options. With a true option, you have the option of paying the strike price and getting your coins at any time. With a binary option, you never pay the strike price and instead the cost of the option is entirely in the premium, which is therefore much greater for binary options. You're risking a lot more money with binary options, especially if the bitcoin price at expiration is very close to the strike price.
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All I want to do is add a bitcoin donation button to a website...and I assumed it would be as simple as the bitcoin wallet address in the href tag and the button image in the image tag and there ya go. If someone clicks, it'll take them where ever the address leads to.
Apparently it's not that simple.
Sure it is. See my signature, for example. Is there a specific problem you're experiencing? I have 1. website, 2. bitcoin wallet address, 3. button image
How exactly do I need to add this?
<a href="bitcoin:address?label=whatever%20you%20want"> <img src="imagefilename" alt="whatever you want"> </a>
You should also have the Bitcoin address in plain text on the website, for the benefit of people who don't have a Bitcoin client installed and are therefore unable to use the link directly. What would I add for a QR code? Where does it go?
You'd add another image. Put it near the donation button. Or make it part of the same image. Either way works. Also, what is the public key and what do I do with it?
The public key is irrelevant and unnecessary for this operation. Do nothing with it. Private key?
Do especially nothing with it. Private = don't put it on your website.
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I thought he wanted his BTC to stay the same value in the future. That's why I said collar.
But they're not his bitcoins. He sold them. He wants to buy them back at a guaranteed price in the future. Hence a call option is the way to go.
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If you had stock you could do a "collar" with options.
No, a collar is where you hold the asset, but don't make or lose money if the price changes, which isn't what the OP wants. Though either strategy requires an options exchange, and there isn't one for bitcoins as far as I know. If I understood correctly, you could do this with a service such as btc.sx.
Explain how. They only do leveraged trading as far as I can tell, not options.
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A futures contract can't do what you want. With a futures contract, you pay for the bitcoins upfront, and get the bitcoins sometime in the future, thus you can't invest your money elsewhere in the meantime (which I assume is the reason you're not simply holding your bitcoins for a month).
What you want is a call option, where you pay a small premium upfront, then pay the full (locked-in) price (called the strike price) when you want to receive the bitcoins. If you don't pay the strike price by the expiration date (which you won't if the bitcoin price has fallen, since you can get the coins cheaper by buying them directly), you don't get the coins and you lose the premium you already paid. Thus, the premium is the cost of this "insurance".
Unfortunately, I don't know of any exchanges that actually offer options trading (someone please correct me if there are).
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I smell an X-Y problem. Why do you want to prove someone owns an address? If you think you need to, you're probably doing something wrong.
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If your maths is as bad as me, You can use the plug in method and just try an error. Most of the time it would save you lots of time... So answer is 1 ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) Pay attention. Biquadratic equations can have up to four solutions. This particular one does, in fact, have four solutions. An answer which gives only one solution is therefore wrong. Now quit giving wrong answers and go back to school.
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The answer is 1 ![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif) Wrong. Remember, biquadratic equations may have as many as four solutions. Since it's a biquadratic equation, we can make it easier by letting z be x^2, so we've got a simple quadratic equation. Simply find the roots of the quadratic equation 1z^2-37z=-36: Add 36 to both sides: 1z^2-37z+36 = 0 Find the discriminant d = 37^2-4*1*36 = 1225 Then solve for z: z = (-(-37)+d^(1/2))/(2*1) z+ = (37+35)/2 z- = (37-35)/2 z+ = 36 z- = 1 Since z = x^2, the solutions to the original biquadratic equation are simply the square roots of z: x++ = 6 x+- = -6 x-+ = 1 x-- = -1 So the four solutions are 6, -6, 1, and -1.
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