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Author Topic: why do i get two different QR for the same address?  (Read 620 times)
pooya87 (OP)
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July 14, 2015, 03:09:49 PM
 #1

two different block explorer give two different QR

here is from blockchain.info

imgur link because it didn't show direct from bc.i !! :


here is same address from btc.blockr.io

.
.BLACKJACK ♠ FUN.
█████████
██████████████
████████████
█████████████████
████████████████▄▄
░█████████████▀░▀▀
██████████████████
░██████████████
████████████████
░██████████████
████████████
███████████████░██
██████████
CRYPTO CASINO &
SPORTS BETTING
▄▄███████▄▄
▄███████████████▄
███████████████████
█████████████████████
███████████████████████
█████████████████████████
█████████████████████████
█████████████████████████
███████████████████████
█████████████████████
███████████████████
▀███████████████▀
█████████
.
98problems
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July 14, 2015, 03:50:44 PM
 #2

what is the difference? when you check it it shows the same address isnt it? so i dont think it makes any problem

pooya87 (OP)
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July 14, 2015, 03:59:46 PM
 #3

what is the difference? when you check it it shows the same address isnt it? so i dont think it makes any problem

i don't know, don't have anything to check them.
i was trying to place my QR somewhere that i realized the two block exploreres that i use give me two different .... shapes ....

is it even possible that the two different QR are the same thing?!

.
.BLACKJACK ♠ FUN.
█████████
██████████████
████████████
█████████████████
████████████████▄▄
░█████████████▀░▀▀
██████████████████
░██████████████
████████████████
░██████████████
████████████
███████████████░██
██████████
CRYPTO CASINO &
SPORTS BETTING
▄▄███████▄▄
▄███████████████▄
███████████████████
█████████████████████
███████████████████████
█████████████████████████
█████████████████████████
█████████████████████████
███████████████████████
█████████████████████
███████████████████
▀███████████████▀
█████████
.
ikydesu
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July 14, 2015, 04:26:45 PM
 #4

The QR code is show the same address.
I've already scan with Mycelium. Maybe because the generator QR code from different site CMIIW.
vendetahome
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July 14, 2015, 05:20:12 PM
 #5

i just scanned it with my phone qr scanner and it shows the same address of bitmixer, though im imrpresses that different codes can have the same meaning
Xialla
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July 14, 2015, 07:30:53 PM
 #6

because even both codes contains same information, they're both using different version of QR symbol.

for details please refer to: https://en.wikipedia.org/wiki/QR_code (actually, pretty nice explanation here)

based on you screens, it seems that first picture from bc.i is version 3 and second one from blockr.io is from version 4. codes looks different, each version using different amount of modules (higher version, more modules), so also code (what you see) is different..
ShetKid
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July 16, 2015, 01:58:35 PM
 #7

because even both codes contains same information, they're both using different version of QR symbol.

for details please refer to: https://en.wikipedia.org/wiki/QR_code (actually, pretty nice explanation here)

based on you screens, it seems that first picture from bc.i is version 3 and second one from blockr.io is from version 4. codes looks different, each version using different amount of modules (higher version, more modules), so also code (what you see) is different..

If they are using different generators then how do different interpreters know which generator has been used to decrypt the QR to give an address ? Wouldn't different generators have different address for both QR codes ?
OnkelPaul
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July 16, 2015, 02:07:45 PM
 #8

If they are using different generators then how do different interpreters know which generator has been used to decrypt the QR to give an address ? Wouldn't different generators have different address for both QR codes ?

No, QR code is defined such that you can encode your information differently, but decoding will always result in the same information that you encoded (and the decoder will know how you encoded stuff, because that's part of the encoding).
For example, you may specify different amount of error correction info, so the total number of bits (small squares) in the QR code is different, but the actual encoded info is the same.
This is especially useful when you intend the QR code to be printed out on paper that may become dirty or slightly damaged. For display on a computer screen, you don't need to add much error correction.
QR is a pretty slick invention :-)

Onkel Paul

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July 16, 2015, 02:09:58 PM
 #9

different qr images for the same wallet address is because of the different generators(encoding) used to generate that QR Images , if you use request for same wallet QR code from different IP address , each time you will get different QR images but all of them will point out to the same wallet address..
in short it is because of the different generators(encoders) used at the time of processing requested QR images.

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