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Topic: MTGOX prova a ribaltare il tavolo !!! - page 52. (Read 41723 times)

hero member
Activity: 728
Merit: 500
Crypto-ideologist
February 10, 2014, 05:43:46 AM
#6
azz, si appellano alla transaction malleability .....  

Shocked

Mettiamo in evidenza


Quote
Technical Explanation:
Bitcoin transactions are subject to a design issue that has been largely ignored, while known to at least a part of the Bitcoin core developers and mentioned on the BitcoinTalk forums. This defect, known as "transaction malleability" makes it possible for a third party to alter the hash of any freshly issued transaction without invalidating the signature, hence resulting in a similar transaction under a different hash. Of course only one of the two transactions can be validated. However, if the party who altered the transaction is fast enough, for example with a direct connection to different mining pools, or has even a small amount of mining power, it can easily cause the transaction hash alteration to be committed to the blockchain.

The bitcoin api "sendtoaddress" broadly used to send bitcoins to a given bitcoin address will return a transaction hash as a way to track the transaction's insertion in the blockchain.
Most wallet and exchange services will keep a record of this said hash in order to be able to respond to users should they inquire about their transaction. It is likely that these services will assume the transaction was not sent if it doesn't appear in the blockchain with the original hash and have currently no means to recognize the alternative transactions as theirs in an efficient way.

This means that an individual could request bitcoins from an exchange or wallet service, alter the resulting transaction's hash before inclusion in the blockchain, then contact the issuing service while claiming the transaction did not proceed. If the alteration fails, the user can simply send the bitcoins back and try again until successful.

We believe this can be addressed by using a different hash for transaction tracking purposes. While the network will continue to use the current hash for the purpose of inclusion in each block's Merkle Tree, the new hash's purpose will be to track a given transaction and can be computed and indexed by hashing the exact signed string via SHA256 (in the same way transactions are currently hashed).

This new transaction hash will allow signing parties to keep track of any transaction they have signed and can easily be computed, even for past transactions.

We have discussed this solution with the Bitcoin core developers and will allow Bitcoin withdrawals again once it has been approved and standardized.

In the meantime, exchanges and wallet services - and any service sending coins directly to third parties - should be extremely careful with anyone claiming their transaction did not go through.

Note that this will also affect any other crypto-currency using the same transaction scheme as Bitcoin.

legendary
Activity: 3276
Merit: 2898
February 10, 2014, 05:41:59 AM
#5
gia', la vogliono buttare in caciara....

pero' in fondo mi piace la cosa, e' un ottimo test per la
vera pentrazione di Bitcoin... vediamo se resiste ad un attacco
cosi' diretto e sporco.

full member
Activity: 140
Merit: 100
February 10, 2014, 05:39:36 AM
#4
ma è vergognoso! ste mer** di gox o vogliono giocare a fare i "soros" della situazione o si sono già "giocati" i btc in tempi non sospetti, attendiamo novità e speriamo bene  Angry
hero member
Activity: 770
Merit: 500
February 10, 2014, 05:28:52 AM
#3
Che botto ragazzi...
e che volumi! Shocked
hero member
Activity: 640
Merit: 500
Archduke of Criptoaerica, vassal of WallStreetCafe
February 10, 2014, 05:24:22 AM
#2
e ci stanno riuscendo bene...
legendary
Activity: 3276
Merit: 2898
February 10, 2014, 05:15:00 AM
#1
Per ora merita un topic a parte,
poi magari hostfat lo sposta....

se ho capito bene il tentativo e' di far crollare tutto !

In pratica non permettono piu' di fare prelievi fino a data da destinarsi,
e dicono che il motivo e' che c'e' un bug nel protocollo biticoin
e di tutte le crypto

https://www.mtgox.com/press_release_20140210.html
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