Posted by Peter Todd
Jun 8, 2026/10:04 UTC
The discussed scheme in the email has vulnerabilities when considering the involvement of miners who might choose favorable fee rates due to the limited capacity of nSequence, which could be easily guessed. To mitigate such issues, it's suggested to incorporate secret nonces into each branch of the signature tree. This approach would prevent brute force attacks on different versions of the tree, enhancing security. By making a nonce public only when revealing new options to miners, one can maintain the integrity and unpredictability of transactions. The recommendation specifies using 128-bit nonces as they are large enough to deter such attacks effectively. For further details and insights, you can refer to Peter Todd's website at Peter Todd.
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