A reasonable default for the bloom filter false positive rate on mainnet. FP rates are values between 0.0 and 1.0 - * where 1.0 is "all transactions" i.e. 100%.
- * - *Users for which low data usage is of utmost concern, 0.0001 may be better, for users - * to whom anonymity is of utmost concern, 0.001 (0.1%) should provide very good privacy.
+ * The default Bloom filter false positive rate, which is selected to be extremely low such that you hardly ever + * download false positives. This provides maximum performance. Although this default can be overridden to push + * the FP rate higher, due to + * various complexities there are still ways a remote peer can deanonymize the users wallet. This is why the + * FP rate is chosen for performance rather than privacy. If a future version of bitcoinj fixes the known + * de-anonymization attacks this FP rate may rise again (or more likely, become expressed as a bandwidth allowance). */ - public static final double DEFAULT_BLOOM_FILTER_FP_RATE = 0.0005; + public static final double DEFAULT_BLOOM_FILTER_FP_RATE = 0.00001; /** Maximum increase in FP rate before forced refresh of the bloom filter */ - public static final double MAX_FP_RATE_INCREASE = 2.0f; + public static final double MAX_FP_RATE_INCREASE = 10.0f; // An object that calculates bloom filters given a list of filter providers, whilst tracking some state useful // for privacy purposes. private final FilterMerger bloomFilterMerger;