diff --git a/zip-0317.html b/zip-0317.html index 77dcb958..682db127 100644 --- a/zip-0317.html +++ b/zip-0317.html @@ -165,10 +165,10 @@ Pull-Request: <https://githu \(grace\_actions = 2\) ;
  • - \(p2pkh\_standard\_input\_size = TODO\) + \(p2pkh\_standard\_input\_size = 150\) bytes;
  • - \(p2pkh\_standard\_output\_size = TODO\) + \(p2pkh\_standard\_output\_size = 34\) bytes.

    • It is not a consensus requirement that fees follow this formula; however, wallets SHOULD create transactions that pay this fee, in order to reduce information leakage, unless overridden by the user.

    @@ -210,6 +210,35 @@ Pull-Request: <    https://githu \(grace\_actions = min\_actions = 2\) . This also ensures that a denial-of-service adversary does not gain a significant per-logical-action cost advantage by using transactions with a smaller or larger number of logical actions.

    +
    Transparent Contribution
    +

    The specified formula calculates the contribution of transparent inputs and outputs based on their total size relative to a typical input or output. Another considered approach was to calculate this contribution simply as + \(\mathsf{max}(transparent\_inputs, transparent\_outputs)\) + . However, this would allow a denial-of-service adversary to create transactions with transparent components containing arbitrarily large scripts.

    +

    The chosen values for + \(p2pkh\_standard\_input\_size\) + and + \(p2pkh\_standard\_output\_size\) + are based on the maximum encoded length for simple P2PKH inputs and outputs, as follows:

    + +

    Simple P2SH inputs and outputs are not typically larger than this.

    +
    Marginal Fee

    This returns the conventional fee for a minimal transaction (as described above) to the original conventional fee of 10000 zatoshis specified in 5, and imposes a non-trivial cost for potential denial-of-service attacks.

    diff --git a/zip-0317.rst b/zip-0317.rst index 98597961..dcf06087 100644 --- a/zip-0317.rst +++ b/zip-0317.rst @@ -132,8 +132,8 @@ The parameters are set to the following values: * :math:`marginal\_fee = 5000`; * :math:`grace\_actions = 2`; -* :math:`p2pkh\_standard\_input\_size = TODO` bytes; -* :math:`p2pkh\_standard\_output\_size = TODO` bytes. +* :math:`p2pkh\_standard\_input\_size = 150` bytes; +* :math:`p2pkh\_standard\_output\_size = 34` bytes. It is not a consensus requirement that fees follow this formula; however, wallets SHOULD create transactions that pay this fee, in order to reduce @@ -198,6 +198,35 @@ ensures that a denial-of-service adversary does not gain a significant per-logical-action cost advantage by using transactions with a smaller or larger number of logical actions. +Transparent Contribution +~~~~~~~~~~~~~~~~~~~~~~~~ + +The specified formula calculates the contribution of transparent inputs +and outputs based on their total size relative to a typical input or +output. Another considered approach was to calculate this contribution +simply as :math:`\mathsf{max}(transparent\_inputs, transparent\_outputs)`. +However, this would allow a denial-of-service adversary to create +transactions with transparent components containing arbitrarily large +scripts. + +The chosen values for :math:`p2pkh\_standard\_input\_size` and +:math:`p2pkh\_standard\_output\_size` are based on the maximum encoded +length for simple P2PKH inputs and outputs, as follows: + +* :math:`p2pkh\_standard\_input\_size` + + * outpoint: 36 bytes + * stack script: 72 bytes + * redeem script: 34 bytes + * sequence: 4 bytes + +* :math:`p2pkh\_standard\_output\_size` + + * value: 8 bytes + * script: 26 bytes + +Simple P2SH inputs and outputs are not typically larger than this. + Marginal Fee ~~~~~~~~~~~~