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Tue, 18 Mar 2025 14:25:56 -0700 (PDT) X-Received: by 2002:a05:620a:1a0b:b0:7c5:3ef2:8c40 with SMTP id af79cd13be357-7c5a827c027mr26436585a.12.1742333156858; Tue, 18 Mar 2025 14:25:56 -0700 (PDT) Received: by 2002:a05:620a:4798:b0:7c5:50d5:7703 with SMTP id af79cd13be357-7c59e577334ms85a; Tue, 18 Mar 2025 09:48:26 -0700 (PDT) X-Received: by 2002:a05:690c:610e:b0:6ef:7dde:bdef with SMTP id 00721157ae682-6ff460cefd8mr224677187b3.23.1742316505894; Tue, 18 Mar 2025 09:48:25 -0700 (PDT) Date: Tue, 18 Mar 2025 09:48:25 -0700 (PDT) From: Erik Aronesty To: Bitcoin Development Mailing List Message-Id: <94689568-7ec5-4f19-b626-c9bdab57f5d8n@googlegroups.com> In-Reply-To: References: Subject: Re: [bitcoindev] Hashed keys are actually fully quantum secure MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1096_1159666171.1742316505614" X-Original-Sender: earonesty@gmail.com Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -0.5 (/) ------=_Part_1096_1159666171.1742316505614 Content-Type: multipart/alternative; boundary="----=_Part_1097_2054699396.1742316505614" ------=_Part_1097_2054699396.1742316505614 Content-Type: text/plain; charset="UTF-8" If your threat model assumes an attacker can promptly recover the private key from the public key then once the user broadcasts his transaction spending both the old output and his own QR output the attacker could simply create his own QR output and RBF the honest transaction. correct. this doesn't provide protection. and any such rule about "spent along with" would be a hard fork. which is fine if qr ever matters (there's still not a lot of evidence that it will). -- You received this message because you are subscribed to the Google Groups "Bitcoin Development Mailing List" group. 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If your threat model assumes an attacker can = promptly recover the private key from the public key then once the user bro= adcasts his transaction spending both the old output and his own QR output = the attacker could simply create his own QR output and RBF the honest trans= action.

correct. =C2=A0 this doesn'= t provide protection.=C2=A0=C2=A0 and any such rule about "spent along with= " would be a hard fork.=C2=A0=C2=A0 which is fine if qr ever matters (there= 's still not a lot of evidence that it will).


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