A bloom filter suitable for use in Bitcoin Connection Bloom Filtering as part of [BIP37](https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki).
npm install bloom-filterA bloom filter suitable for use in Bitcoin Connection Bloom Filtering as part of BIP37.
``bash`
npm install bloom-filter
`javascript
var BloomFilter = require('bloom-filter');
// convenient method to initialize the filter
var numberOfElements = 3;
var falsePositiveRate = 0.01;
var filter = BloomFilter.create(numberofElements, falsePositiveRate);
// elements
var a = new Buffer('99108ad8ed9bb6274d3980bab5a85c048f0950c8', 'hex');
var b = new Buffer('19108ad8ed9bb6274d3980bab5a85c048f0950c8', 'hex');
var c = new Buffer('b5a2c786d9ef4658287ced5914b37a1b4aa32eee', 'hex');
// insert elements
filter.insert(a);
filter.insert(b);
// check if elements match
assert(!filter.contains(c));
assert(filter.contains(a));
// reinstantiate from an object
var serialized = filter.toObject();
var filter = new BloomFilter(serialized);
// initialize directly
var filter = new BloomFilter({
vData: [], // the data of the filter
nHashFucs: 3, // the number of hash functions to use
nTweak: 2147483649, // the seed used for the hash fuctions
nFlags: 0 // flags used to update the filter when matched
});
``
Code released under the MIT license.
Copyright 2015 BitPay, Inc.