diff --git a/go.mod b/go.mod
index c06393a..89ce563 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module github.com/nbd-wtf/go-nostr
 go 1.24.1
 
 require (
+	github.com/FastFilter/xorfilter v0.2.1
 	github.com/ImVexed/fasturl v0.0.0-20230304231329-4e41488060f3
 	github.com/PowerDNS/lmdb-go v1.9.3
 	github.com/bluekeyes/go-gitdiff v0.7.1
@@ -33,6 +34,7 @@ require (
 	golang.org/x/crypto v0.36.0
 	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394
 	golang.org/x/net v0.37.0
+	golang.org/x/sync v0.12.0
 	golang.org/x/text v0.23.0
 	modernc.org/sqlite v1.33.1
 )
diff --git a/go.sum b/go.sum
index eed1f67..0bc1fbb 100644
--- a/go.sum
+++ b/go.sum
@@ -8,6 +8,8 @@ github.com/FactomProject/basen v0.0.0-20150613233007-fe3947df716e h1:ahyvB3q25Yn
 github.com/FactomProject/basen v0.0.0-20150613233007-fe3947df716e/go.mod h1:kGUqhHd//musdITWjFvNTHn90WG9bMLBEPQZ17Cmlpw=
 github.com/FactomProject/btcutilecc v0.0.0-20130527213604-d3a63a5752ec h1:1Qb69mGp/UtRPn422BH4/Y4Q3SLUrD9KHuDkm8iodFc=
 github.com/FactomProject/btcutilecc v0.0.0-20130527213604-d3a63a5752ec/go.mod h1:CD8UlnlLDiqb36L110uqiP2iSflVjx9g/3U9hCI4q2U=
+github.com/FastFilter/xorfilter v0.2.1 h1:lbdeLG9BdpquK64ZsleBS8B4xO/QW1IM0gMzF7KaBKc=
+github.com/FastFilter/xorfilter v0.2.1/go.mod h1:aumvdkhscz6YBZF9ZA/6O4fIoNod4YR50kIVGGZ7l9I=
 github.com/ImVexed/fasturl v0.0.0-20230304231329-4e41488060f3 h1:ClzzXMDDuUbWfNNZqGeYq4PnYOlwlOVIvSyNaIy0ykg=
 github.com/ImVexed/fasturl v0.0.0-20230304231329-4e41488060f3/go.mod h1:we0YA5CsBbH5+/NUzC/AlMmxaDtWlXeNsqrwXjTzmzA=
 github.com/PowerDNS/lmdb-go v1.9.3 h1:AUMY2pZT8WRpkEv39I9Id3MuoHd+NZbTVpNhruVkPTg=
@@ -55,6 +57,8 @@ github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4
 github.com/bytedance/sonic/loader v0.2.4 h1:ZWCw4stuXUsn1/+zQDqeE7JKP+QO47tz7QCNan80NzY=
 github.com/bytedance/sonic/loader v0.2.4/go.mod h1:N8A3vUdtUebEY2/VQC0MyhYeKUFosQU6FxH2JmUe6VI=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
diff --git a/sdk/wot.go b/sdk/wot.go
new file mode 100644
index 0000000..af5db2f
--- /dev/null
+++ b/sdk/wot.go
@@ -0,0 +1,44 @@
+package sdk
+
+import (
+	"context"
+	"maps"
+	"slices"
+	"strconv"
+
+	"github.com/FastFilter/xorfilter"
+	"golang.org/x/sync/errgroup"
+)
+
+func (sys *System) GetWoT(ctx context.Context, pubkey string) (map[uint64]struct{}, error) {
+	g, ctx := errgroup.WithContext(ctx)
+
+	res := make(chan uint64)
+	for _, f := range sys.FetchFollowList(ctx, pubkey).Items {
+		g.Go(func() error {
+			for _, f2 := range sys.FetchFollowList(ctx, f.Pubkey).Items {
+				shid, _ := strconv.ParseUint(f2.Pubkey[32:48], 16, 64)
+				res <- shid
+			}
+			return nil
+		})
+	}
+
+	result := make(map[uint64]struct{})
+	go func() {
+		for shid := range res {
+			result[shid] = struct{}{}
+		}
+	}()
+
+	return result, g.Wait()
+}
+
+func (sys *System) GetWoTFilter(ctx context.Context, pubkey string) (*xorfilter.Xor8, error) {
+	m, err := sys.GetWoT(ctx, pubkey)
+	if err != nil {
+		return nil, err
+	}
+
+	return xorfilter.Populate(slices.Collect(maps.Keys(m)))
+}