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Topic: Some BTC addresses start with a "3" (Read 1456 times)

legendary
Activity: 1204
Merit: 1028
February 11, 2015, 10:01:16 AM
#22
For some reason, I dislike all addresses that do not being with an 1. It's just not as aesthetically pleasing to the eye.
legendary
Activity: 966
Merit: 1000
February 11, 2015, 09:55:29 AM
#21
they are multisignature adresses! now bitstamp uses that type of adresses

Does that guarantee that they wont lose funds ever again ?
Bassicaly yes but there could be still some exploit in sight that isn't discovered yet but some mastermind may find it.
newbie
Activity: 42
Merit: 0
February 11, 2015, 09:09:00 AM
#20
I've learned something new today.

Thanks to the thread starter for asking this question.

Address starting with 3 is a multisignature address, a address requiring 2-of-3 signatures to be able to be spent. It is an address associated with more than one ECDSA private key. It is usually used as cold storage as it is harder for one to steal 2 private keys compared to 1. It can also be a protection against malware as you could keep the keys on separate computers. Keeping one of the three keys safety is also a good practice, if one of the keys is lost, the bitcoin can still be spent using 2 of the remaining keys. It can also be shared between multiple people, majority of the people can vote and spend the coin.

That is really useful. I've already asked myself if it would be possible to "split" the key for security reasons and have some kind of fallback in case I loose one part. Great to see that a solution exists already.
legendary
Activity: 1610
Merit: 1183
February 11, 2015, 08:38:21 AM
#19
Interesting. My friend was in Bit-x and told me about the 3 thing. It was really weird, I thought it was some sort of altcoin.
legendary
Activity: 3038
Merit: 4418
Crypto Swap Exchange
February 11, 2015, 05:43:08 AM
#18
they are multisignature adresses! now bitstamp uses that type of adresses

Does that guarantee that they wont lose funds ever again ?
No. If an attacker were to have at least two of the private keys associated with bitstamp's mltisig address(es) then they could steal their funds, although it would be less likely that an attacker would be able to do so.

As mentioned many times above an address starting with a 3 is a multisg address
That scenario is highly unlikely to happen. If a attacker gain access to the server, the attacker would only gain access to one of the key. To steal the funds, the attacker would have to go through bitgo's check. If invalidated, the attack will fail. Technically this is safe if done right. Eg. Keeping the third key safe in case anything happens.
hero member
Activity: 544
Merit: 500
February 11, 2015, 04:18:19 AM
#17
Well, you will find that the exchange in my signature does use multi-sig addresses and currently uses addresses that start with a "3". Case solved.
full member
Activity: 209
Merit: 100
February 10, 2015, 11:56:04 PM
#16
they are multisignature adresses! now bitstamp uses that type of adresses

Does that guarantee that they wont lose funds ever again ?
No. If an attacker were to have at least two of the private keys associated with bitstamp's mltisig address(es) then they could steal their funds, although it would be less likely that an attacker would be able to do so.

As mentioned many times above an address starting with a 3 is a multisg address
legendary
Activity: 2968
Merit: 1895
February 09, 2015, 04:43:53 PM
#15
...

pooya87

That bitcoin/wiki link explains a lot, thank you!

Highly recommended for these BTC address questions.
legendary
Activity: 3472
Merit: 10611
February 09, 2015, 12:50:18 PM
#14
it starts either with 1 or 3 and interesting enough the first example on https://en.bitcoin.it/wiki/Address is this one "3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy" which starts with 3 Cheesy which is associated with the new features
hero member
Activity: 560
Merit: 504
February 09, 2015, 12:23:38 PM
#13
Hmm, are you guys sure that there is such a strict distinction between the two?
I was aware that your usual one-man-address starts with 1 and your usual
multisig address with 3. But to my knowledge a 3-address can also be a regular
onesig address, although an unusual one.
3-address are pay-to-script-hash addresses (P2SH in short). Most of the time they are used to do multisig but they are not limited to that. You probably saw one that does something different. Alternatively, you can also do multisig without a 3-address. It is rare but possible.


Thanks, hhanh00. That seems to be the ultimate answer: 1... is public key hash while 3... is pay to script hash, see
https://en.bitcoin.it/wiki/Pay_to_script_hash
An explanation like
they are multisignature adresses!
is thus an oversimplification in my eyes.
legendary
Activity: 1778
Merit: 1043
#Free market
February 09, 2015, 09:47:18 AM
#12
they are multisignature adresses! now bitstamp uses that type of adresses

Also TheRockTrading, it uses greenAddress ( multiSign +2FA + instant confirm -if the other user uses also greenaddress as wallet).
full member
Activity: 168
Merit: 100
February 09, 2015, 09:47:16 AM
#11
they are multisignature adresses! now bitstamp uses that type of adresses

Does that guarantee that they wont lose funds ever again ?
hero member
Activity: 714
Merit: 503
February 09, 2015, 09:46:06 AM
#10
they are multisignature adresses! now bitstamp uses that type of adresses
legendary
Activity: 1232
Merit: 1000
February 09, 2015, 09:43:21 AM
#9
Aah.....
I always wondered why the addresses in BitX started with 3.
Now that makes sense.
sr. member
Activity: 467
Merit: 267
February 08, 2015, 07:22:16 AM
#8
Hmm, are you guys sure that there is such a strict distinction between the two?
I was aware that your usual one-man-address starts with 1 and your usual
multisig address with 3. But to my knowledge a 3-address can also be a regular
onesig address, although an unusual one.
3-address are pay-to-script-hash addresses (P2SH in short). Most of the time they are used to do multisig but they are not limited to that. You probably saw one that does something different. Alternatively, you can also do multisig without a 3-address. It is rare but possible.

hero member
Activity: 560
Merit: 504
February 08, 2015, 07:15:06 AM
#7
Hmm, are you guys sure that there is such a strict distinction between the two?
I was aware that your usual one-man-address starts with 1 and your usual
multisig address with 3. But to my knowledge a 3-address can also be a regular
onesig address, although an unusual one.
hero member
Activity: 765
Merit: 503
February 08, 2015, 07:05:54 AM
#6
...

ranochigo, pedrog, and cheekychap

Thank you, one can learn something every day!   Smiley

*  *  *

What about posting "interesting looking" addresses?  Is that considered "Bad Form" (publicizing someone's public key just so I can get a question answered)?
Every address is public knowledge.  Associating it with an individual could be considered poor form.
legendary
Activity: 2968
Merit: 1895
February 07, 2015, 12:26:25 AM
#5
...

ranochigo, pedrog, and cheekychap

Thank you, one can learn something every day!   Smiley

*  *  *

What about posting "interesting looking" addresses?  Is that considered "Bad Form" (publicizing someone's public key just so I can get a question answered)?
full member
Activity: 182
Merit: 100
February 07, 2015, 12:23:53 AM
#4
Like others said its a multisig address .Other addresses start with 1.
I saw it the first time, I signed up for Bit-x. Thought they had it that ways somehow.
legendary
Activity: 2786
Merit: 1031
February 07, 2015, 12:21:00 AM
#3
Multi-signature addresses

Addresses can be created that require a combination of multiple private keys. Since these take advantage of newer features, they begin with the newer prefix of 3 instead of the older 1. These can be thought of as the equivalent of writing a check to two parties - "pay to the order of somebody AND somebody else" - where both parties must endorse the check in order to receive the funds.

The actual requirement (number of private keys needed, their corresponding public keys, etc.) that must be satisfied to spend the funds is decided in advance by the person generating this type of address, and once an address is created, the requirement cannot be changed without generating a new address.


https://en.bitcoin.it/wiki/Address#Multi-signature_addresses
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