diff --git a/bip-0009.mediawiki b/bip-0009.mediawiki index 6848c45e..83ce7d00 100644 --- a/bip-0009.mediawiki +++ b/bip-0009.mediawiki @@ -28,12 +28,16 @@ Each soft fork deployment is specified by the following per-chain parameters (fu # The '''starttime''' specifies a minimum median time past of a block at which the bit gains its meaning. # The '''timeout''' specifies a time at which the deployment is considered failed. If the median time past of a block >= timeout and the soft fork has not yet locked in (including this block's bit state), the deployment is considered failed on all descendants of the block. -The starttime should be set to some date in the future, coordinates with software release date. This is to prevent -triggers as a result of parties running pre-release software. The timeout should be set a reasonable time after the -starttime. A later deployment using the same bit is possible as long as the starttime is after the previous one's -timeout or activation, though it is recommended to have a pause in between to detect buggy software. +===Selection guidelines=== -Setting the timeout to 3 years after the starttime allows at least 9 new deployments per year. +The following guidelines are suggested for selecting these parameters for a soft fork: + +# '''bit''' should be selected such that no two concurrent softforks use the same bit. +# '''starttime''' should be set to some date in the future, approximately one month software release date including the soft fork. This allows for some release delays, while preventing triggers as a result of parties running pre-release software. +# '''timeout''' should be 1 year (31536000 seconds) after starttime. + +A later deployment using the same bit is possible as long as the starttime is after the previous one's +timeout or activation, though it is recommended to have a pause in between to detect buggy software. ===States===