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Title: BIP47 - Reusable Payment Codes - Notification Tx Post by: redPanda on February 24, 2016, 03:04:47 PM From BIP47 on mediawiki:
https://github.com/bitcoin/bips/blob/master/bip-0047.mediawiki step 3 of the notification tx: Quote 3. Alice serializes her payment code in binary form. According the Binary Serialization on the same page,the Payment Code is essentially Alice's pubkey (A = a * G) and Alice's Chain Code(c) in the next step: Quote 4. Alice renders her payment code (P) unreadable to anyone except Bob: The problem is x is the x coordinate of the secret point S = a * B = (x, y)i. Replace the x value with x': where a is Alice's privatekey and B is Bob's publickey point (B = b * G) Question: even if I replace x by x', it won't change the value of the Payment Code since x is not involved in this value ! What I'm missing ? Title: Re: BIP47 - Reusable Payment Codes - Notification Tx Post by: justusranvier on February 24, 2016, 10:04:53 PM Quote 4. Alice renders her payment code (P) unreadable to anyone except Bob: The problem is x is the x coordinate of the secret point S = a * B = (x, y)i. Replace the x value with x': where a is Alice's privatekey and B is Bob's publickey point (B = b * G) Question: even if I replace x by x', it won't change the value of the Payment Code since x is not involved in this value ! What I'm missing ? In step 4, you xor the x value and chain code portions of the payment code with the blinding factor. This means the data you put in the OP_RETURN output is only readable by the recipient. Title: Re: BIP47 - Reusable Payment Codes - Notification Tx Post by: thejaytiesto on March 01, 2016, 07:01:54 PM Im looking forward to this BIP to increase the overall privacy of Bitcoin. Do you think this will get added soon? I think this idea of mixing all transactions by default is an excellent idea.. the optional should be to not mix it, but by default the transaction should be mixed so default state of transaction is "cash mode" ..
I wonder what core devs like gmaxwell think of this BIP and when can we expect a Bitcoin where all transactions are mixed natively so it feels more like cash like it should be. Title: Re: BIP47 - Reusable Payment Codes - Notification Tx Post by: justusranvier on March 01, 2016, 08:42:06 PM Do you think this will get added soon? Wallets can implement this whenever they like. Several have already started. |