Re: [bitcoin-dev] Replay attacks make BIP148 and BIP149 untennable

[Tao Effect <contact@taoeffect.com>]

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> CPFP can be used by an attacker to get your original txn into the 148 chain.

*err, my bad that's unlikely to happen, if I remember correctly CPFP can only be done by the person you're sending the coins to. Coin-mixing seems the better option of the two, but shouldn't the BIP148 folks wait until it's clear that will be supported by exchanges?

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> On Jun 6, 2017, at 4:27 PM, Tao Effect <contact@taoeffect.com <mailto:contact@taoeffect.com>> wrote:
> 
>> CoinJoin works as a method of both improving fungibility and mixing with
>> coinbase transactions.
> 
> My understanding is that the two situations are quite different.
> 
> Unlike mixing to coin-split, CoinJoin doesn't create a high demand exclusively for coinbase transactions.
> 
> However, of the proposed methods, coin-mixing seems the better option, because it might be reasonably easy (I don't know) for exchanges to obtain 148 coinbase coins, and mix their coins with them, extending the coin-splitting capability beyond just miner coins and then using that to split incoming coins.
> 
> That seems like the most reasonable approach I've heard so far. Whether exchanges would be willing to do that is a separate question.
> 
>> When it's confirmed on one chain, but not on the other, you
>> can then "double-spend" on the lower hashrate chain with a higher fee,
>> to end up with different coins on both chains.
> 
> This method is time consuming and not guaranteed to work. CPFP can be used by an attacker to get your original txn into the 148 chain.
> 
>> (also, no double-n in untenable)
> 
> Why thank you aj, you're so good at spelling. :-)
> 
> Cheers,
> Greg
> 


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