diff --git a/README.md b/README.md
index 1c1cbee..cc55b31 100644
--- a/README.md
+++ b/README.md
@@ -34,8 +34,14 @@ npm install @wisehodl/roots
 2. Import it:
 
 ```typescript
-import { Event, Filter, Keys } from '@wisehodl/roots';
-import type { EventData, FilterData } from '@wisehodl/roots';
+import * as events from '@wisehodl/roots/events';
+import * as filters from '@wisehodl/roots/filters';
+import * as keys from '@wisehodl/roots/keys';
+import * as constants from '@wisehodl/roots/constants';
+import * as errors from '@wisehodl/roots/errors';
+
+import type { Event } from '@wisehodl/roots/events';
+import type { Filter } from '@wisehodl/roots/filters';
 ```
 
 ## Usage Examples
@@ -45,15 +51,15 @@ import type { EventData, FilterData } from '@wisehodl/roots';
 #### Generate a new keypair
 
 ```typescript
-const privateKey = Keys.generatePrivateKey();
-const publicKey = Keys.getPublicKey(privateKey);
+const privateKey = keys.generatePrivateKey();
+const publicKey = keys.getPublicKey(privateKey);
 ```
 
 #### Derive public key from existing private key
 
 ```typescript
 const privateKey = "f43a0435f69529f310bbd1d6263d2fbf0977f54bfe2310cc37ae5904b83bb167";
-const publicKey = Keys.getPublicKey(privateKey);
+const publicKey = keys.getPublicKey(privateKey);
 // publicKey: "cfa87f35acbde29ba1ab3ee42de527b2cad33ac487e80cf2d6405ea0042c8fef"
 ```
 
@@ -65,7 +71,7 @@ const publicKey = Keys.getPublicKey(privateKey);
 
 ```typescript
 // 1. Build the event structure
-const event: EventData = {
+const event: Event = {
   pubkey: publicKey,
   created_at: Math.floor(Date.now() / 1000),
   kind: 1,
@@ -79,11 +85,11 @@ const event: EventData = {
 };
 
 // 2. Compute the event ID
-const id = Event.getID(event);
+const id = events.getID(event);
 event.id = id;
 
 // 3. Sign the event
-const sig = Event.sign(id, privateKey);
+const sig = events.sign(id, privateKey);
 event.sig = sig;
 ```
 
@@ -91,13 +97,13 @@ event.sig = sig;
 
 ```typescript
 // Returns canonical JSON: [0, pubkey, created_at, kind, tags, content]
-const serialized = Event.serialize(event);
+const serialized = events.serialize(event);
 ```
 
 #### Compute event ID manually
 
 ```typescript
-const id = Event.getID(event);
+const id = events.getID(event);
 // Returns lowercase hex SHA-256 hash of serialized form
 ```
 
@@ -110,7 +116,7 @@ const id = Event.getID(event);
 ```typescript
 // Checks structure, ID computation, and signature
 try {
-  Event.validate(event);
+  events.validate(event);
 } catch (err) {
   console.log(`Invalid event: ${err.message}`);
 }
@@ -121,21 +127,21 @@ try {
 ```typescript
 // Check field formats and lengths
 try {
-  Event.validateStructure(event);
+  events.validateStructure(event);
 } catch (err) {
   console.log(`Malformed structure: ${err.message}`);
 }
 
 // Verify ID matches computed hash
 try {
-  Event.validateID(event);
+  events.validateID(event);
 } catch (err) {
   console.log(`ID mismatch: ${err.message}`);
 }
 
 // Verify cryptographic signature
 try {
-  Event.validateSignature(event);
+  events.validateSignature(event);
 } catch (err) {
   console.log(`Invalid signature: ${err.message}`);
 }
@@ -148,18 +154,18 @@ try {
 #### Marshal event to JSON
 
 ```typescript
-const jsonString = JSON.stringify(Event.toJSON(event));
-// Standard JSON.stringify works with Event.toJSON()
+const jsonString = JSON.stringify(events.toJSON(event));
+// Standard JSON.stringify works with events.toJSON()
 ```
 
 #### Unmarshal event from JSON
 
 ```typescript
-const event = Event.fromJSON(JSON.parse(jsonString));
+const event = events.fromJSON(JSON.parse(jsonString));
 
 // Validate after unmarshaling
 try {
-  Event.validate(event);
+  events.validate(event);
 } catch (err) {
   console.log(`Received invalid event: ${err.message}`);
 }
@@ -175,7 +181,7 @@ try {
 const since = Math.floor(Date.now() / 1000) - (24 * 60 * 60);
 const limit = 50;
 
-const filter: FilterData = {
+const filter: Filter = {
   ids: ["abc123", "def456"],  // Prefix match
   authors: ["cfa87f35"],      // Prefix match
   kinds: [1, 6, 7],
@@ -187,7 +193,7 @@ const filter: FilterData = {
 #### Filter with tag conditions
 
 ```typescript
-const filter: FilterData = {
+const filter: Filter = {
   kinds: [1],
   tags: {
     e: ["5c83da77af1dec6d7289834998ad7aafbd9e2191396d75ec3cc27f5a77226f36"],
@@ -201,7 +207,7 @@ const filter: FilterData = {
 ```typescript
 // Extensions allow arbitrary JSON fields beyond the standard filter spec.
 // For example, this is how to implement non-standard filters like 'search'.
-const filter: FilterData = {
+const filter: Filter = {
   kinds: [1],
   extensions: {
     search: "bitcoin",
@@ -219,12 +225,12 @@ const filter: FilterData = {
 #### Match single event
 
 ```typescript
-const filter: FilterData = {
+const filter: Filter = {
   authors: ["cfa87f35"],
   kinds: [1],
 };
 
-if (Filter.matches(filter, event)) {
+if (filters.matches(filter, event)) {
   // Event satisfies all filter conditions
 }
 ```
@@ -233,7 +239,7 @@ if (Filter.matches(filter, event)) {
 
 ```typescript
 const since = Math.floor(Date.now() / 1000) - (60 * 60);
-const filter: FilterData = {
+const filter: Filter = {
   kinds: [1],
   since: since,
   tags: {
@@ -241,7 +247,7 @@ const filter: FilterData = {
   },
 };
 
-const matches = events.filter(event => Filter.matches(filter, event));
+const matches = eventCollection.filter(event => filters.matches(filter, event));
 ```
 
 ---
@@ -251,7 +257,7 @@ const matches = events.filter(event => Filter.matches(filter, event));
 #### Marshal filter to JSON
 
 ```typescript
-const filter: FilterData = {
+const filter: Filter = {
   ids: ["abc123"],
   kinds: [1],
   tags: {
@@ -262,7 +268,7 @@ const filter: FilterData = {
   },
 };
 
-const jsonString = JSON.stringify(Filter.toJSON(filter));
+const jsonString = JSON.stringify(filters.toJSON(filter));
 // Result: {"ids":["abc123"],"kinds":[1],"#e":["event-id"],"search":"nostr"}
 ```
 
@@ -277,7 +283,7 @@ const jsonData = `{
   "search": "bitcoin"
 }`;
 
-const filter = Filter.fromJSON(JSON.parse(jsonData));
+const filter = filters.fromJSON(JSON.parse(jsonData));
 
 // Standard fields populated: authors, kinds, since
 // Tag filters populated: tags.e = ["abc123"]
@@ -299,7 +305,7 @@ During marshaling, extensions merge into the output JSON. During unmarshaling, u
 Example implementing search filter:
 
 ```typescript
-const filter: FilterData = {
+const filter: Filter = {
   kinds: [1],
   extensions: {
     search: "bitcoin",
diff --git a/package.json b/package.json
index d33ce5f..f9e8d8c 100644
--- a/package.json
+++ b/package.json
@@ -1,13 +1,27 @@
 {
   "name": "@wisehodl/roots",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "A minimal Nostr protocol library for typescript",
-  "types": "./dist/types.d.ts",
-  "main": "./dist/index.js",
   "exports": {
-    ".": {
-      "import": "./dist/index.js",
-      "types": "./dist/index.d.ts"
+    "./events": {
+      "import": "./dist/events/index.js",
+      "types": "./dist/events/index.d.ts"
+    },
+    "./filters": {
+      "import": "./dist/filters/index.js",
+      "types": "./dist/filters/index.d.ts"
+    },
+    "./keys": {
+      "import": "./dist/keys/index.js",
+      "types": "./dist/keys/index.d.ts"
+    },
+    "./constants": {
+      "import": "./dist/constants/index.js",
+      "types": "./dist/constants/index.d.ts"
+    },
+    "./errors": {
+      "import": "./dist/errors/index.js",
+      "types": "./dist/errors/index.d.ts"
     }
   },
   "files": [
diff --git a/src/constants.ts b/src/constants/index.ts
similarity index 100%
rename from src/constants.ts
rename to src/constants/index.ts
diff --git a/src/errors.ts b/src/errors/index.ts
similarity index 100%
rename from src/errors.ts
rename to src/errors/index.ts
diff --git a/src/event.ts b/src/event.ts
deleted file mode 100644
index 643225a..0000000
--- a/src/event.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { EventJSON } from "./event_json";
-import { EventID } from "./id";
-import { Sign } from "./sign";
-import { Validate } from "./validate";
-
-export const Event = {
-  ...EventID,
-  ...Sign,
-  ...Validate,
-  ...EventJSON,
-};
diff --git a/src/events/event.ts b/src/events/event.ts
new file mode 100644
index 0000000..2fea0c9
--- /dev/null
+++ b/src/events/event.ts
@@ -0,0 +1,20 @@
+/**
+ * Tag represents a single tag within an event as an array of strings.
+ * The first element identifies the tag name, the second contains the value,
+ * and subsequent elements are optional.
+ */
+export type Tag = string[];
+
+/**
+ * Event represents a Nostr protocol event with its seven required fields.
+ * All fields must be present for a valid event.
+ */
+export interface Event {
+  id: string;
+  pubkey: string;
+  created_at: number;
+  kind: number;
+  tags: Tag[];
+  content: string;
+  sig: string;
+}
diff --git a/src/event_json.test.ts b/src/events/event_json.test.ts
similarity index 68%
rename from src/event_json.test.ts
rename to src/events/event_json.test.ts
index 31d609e..d0d6ec8 100644
--- a/src/event_json.test.ts
+++ b/src/events/event_json.test.ts
@@ -1,24 +1,24 @@
 import { describe, expect, test } from "vitest";
 
-import { EventJSON } from "./event_json";
-import type { EventData } from "./types";
-import { testEvent, testEventJSON, testPK } from "./util.test";
-import { Validate } from "./validate";
+import { testEvent, testEventJSON, testPK } from "../util.test";
+import type { Event } from "./event";
+import { fromJSON, toJSON } from "./event_json";
+import { validate } from "./validate";
 
 describe("Event JSON", () => {
   test("unmarshal event JSON", () => {
-    const event = EventJSON.fromJSON(JSON.parse(testEventJSON));
-    expect(() => Validate.validate(event)).not.toThrow();
+    const event = fromJSON(JSON.parse(testEventJSON));
+    expect(() => validate(event)).not.toThrow();
     expectEqualEvents(event, testEvent);
   });
 
   test("marshal event JSON", () => {
-    const eventJSON = JSON.stringify(EventJSON.toJSON(testEvent));
+    const eventJSON = JSON.stringify(toJSON(testEvent));
     expect(eventJSON).toBe(testEventJSON);
   });
 
   test("event JSON round trip", () => {
-    const event: EventData = {
+    const event: Event = {
       id: "86e856d0527dd08527498cd8afd8a7d296bde37e4757a8921f034f0b344df3ad",
       pubkey: testPK,
       created_at: 1760740551,
@@ -34,18 +34,18 @@ describe("Event JSON", () => {
 
     const expectedJSON = `{"id":"86e856d0527dd08527498cd8afd8a7d296bde37e4757a8921f034f0b344df3ad","pubkey":"cfa87f35acbde29ba1ab3ee42de527b2cad33ac487e80cf2d6405ea0042c8fef","created_at":1760740551,"kind":1,"tags":[["a","value"],["b","value","optional"],["name","value","optional","optional"]],"content":"hello world","sig":"c05fe02a9c082ff56aad2b16b5347498a21665f02f050ba086dbe6bd593c8cd448505d2831d1c0340acc1793eaf89b7c0cb21bb696c71da6b8d6b857702bb557"}`;
 
-    expect(() => Validate.validate(event)).not.toThrow();
+    expect(() => validate(event)).not.toThrow();
 
-    const eventJSON = JSON.stringify(EventJSON.toJSON(event));
+    const eventJSON = JSON.stringify(toJSON(event));
     expect(eventJSON).toBe(expectedJSON);
 
-    const unmarshalledEvent = EventJSON.fromJSON(JSON.parse(eventJSON));
-    expect(() => Validate.validate(unmarshalledEvent)).not.toThrow();
+    const unmarshalledEvent = fromJSON(JSON.parse(eventJSON));
+    expect(() => validate(unmarshalledEvent)).not.toThrow();
     expectEqualEvents(unmarshalledEvent, event);
   });
 });
 
-function expectEqualEvents(got: EventData, want: EventData): void {
+function expectEqualEvents(got: Event, want: Event): void {
   expect(got.id).toBe(want.id);
   expect(got.pubkey).toBe(want.pubkey);
   expect(got.created_at).toBe(want.created_at);
diff --git a/src/event_json.ts b/src/events/event_json.ts
similarity index 78%
rename from src/event_json.ts
rename to src/events/event_json.ts
index 76fb281..0ff3fcc 100644
--- a/src/event_json.ts
+++ b/src/events/event_json.ts
@@ -1,11 +1,11 @@
-import type { EventData } from "./types";
+import type { Event } from "./event";
 
 /**
  * Converts an event to a plain object suitable for JSON.stringify().
  * @param event - Event to convert
  * @returns Plain object matching JSON structure
  */
-function toJSON(event: EventData): object {
+export function toJSON(event: Event): object {
   return {
     id: event.id,
     pubkey: event.pubkey,
@@ -22,7 +22,7 @@ function toJSON(event: EventData): object {
  * @param json - Parsed JSON object
  * @returns Event instance
  */
-function fromJSON(json: any): EventData {
+export function fromJSON(json: any): Event {
   return {
     id: json.id || "",
     pubkey: json.pubkey || "",
@@ -33,8 +33,3 @@ function fromJSON(json: any): EventData {
     sig: json.sig || "",
   };
 }
-
-export const EventJSON = {
-  toJSON,
-  fromJSON,
-};
diff --git a/src/id.test.ts b/src/events/id.test.ts
similarity index 96%
rename from src/id.test.ts
rename to src/events/id.test.ts
index 5497383..a9e0725 100644
--- a/src/id.test.ts
+++ b/src/events/id.test.ts
@@ -1,12 +1,12 @@
 import { describe, expect, test } from "vitest";
 
-import { EventID } from "./id";
-import type { EventData } from "./types";
-import { testEvent, testPK } from "./util.test";
+import { testEvent, testPK } from "../util.test";
+import type { Event } from "./event";
+import { getID } from "./id";
 
 interface IDTestCase {
   name: string;
-  event: EventData;
+  event: Event;
   expected: string;
 }
 
@@ -215,7 +215,7 @@ const idTestCases: IDTestCase[] = [
 
 describe("EventID.getID", () => {
   test.each(idTestCases)("$name", ({ event, expected }) => {
-    const actual = EventID.getID(event);
+    const actual = getID(event);
     expect(actual).toBe(expected);
   });
 });
diff --git a/src/id.ts b/src/events/id.ts
similarity index 81%
rename from src/id.ts
rename to src/events/id.ts
index e2a4a49..7065ad2 100644
--- a/src/id.ts
+++ b/src/events/id.ts
@@ -1,7 +1,7 @@
 import { sha256 } from "@noble/hashes/sha2.js";
 import { bytesToHex } from "@noble/hashes/utils.js";
 
-import type { EventData } from "./types";
+import type { Event } from "./event";
 
 /**
  * Serializes an event into canonical JSON array format for ID computation.
@@ -9,7 +9,7 @@ import type { EventData } from "./types";
  * @param event - Event to serialize
  * @returns Canonical JSON string
  */
-function serialize(event: EventData): string {
+export function serialize(event: Event): string {
   const serialized = [
     0,
     event.pubkey,
@@ -26,13 +26,8 @@ function serialize(event: EventData): string {
  * @param event - Event to compute ID for
  * @returns 64-character lowercase hexadecimal event ID
  */
-function getID(event: EventData): string {
+export function getID(event: Event): string {
   const serialized = serialize(event);
   const hash = sha256(new TextEncoder().encode(serialized));
   return bytesToHex(hash);
 }
-
-export const EventID = {
-  serialize,
-  getID,
-};
diff --git a/src/events/index.ts b/src/events/index.ts
new file mode 100644
index 0000000..da4b764
--- /dev/null
+++ b/src/events/index.ts
@@ -0,0 +1,5 @@
+export * from "./event";
+export * from "./event_json";
+export * from "./id";
+export * from "./sign";
+export * from "./validate";
diff --git a/src/sign.test.ts b/src/events/sign.test.ts
similarity index 52%
rename from src/sign.test.ts
rename to src/events/sign.test.ts
index 35ab625..0352d23 100644
--- a/src/sign.test.ts
+++ b/src/events/sign.test.ts
@@ -1,22 +1,22 @@
 import { describe, expect, test } from "vitest";
 
-import { Sign } from "./sign";
-import { testEvent, testSK } from "./util.test";
+import { testEvent, testSK } from "../util.test";
+import { sign } from "./sign";
 
-describe("Sign.sign", () => {
+describe("sign", () => {
   test("produces correct signature", () => {
-    const signature = Sign.sign(testEvent.id, testSK);
+    const signature = sign(testEvent.id, testSK);
     expect(signature).toBe(testEvent.sig);
   });
 
   test("throws on invalid event ID", () => {
-    expect(() => Sign.sign("thisisabadeventid", testSK)).toThrow(
+    expect(() => sign("thisisabadeventid", testSK)).toThrow(
       /hex string expected,.*/,
     );
   });
 
   test("throws on invalid private key", () => {
-    expect(() => Sign.sign(testEvent.id, "thisisabadsecretkey")).toThrow(
+    expect(() => sign(testEvent.id, "thisisabadsecretkey")).toThrow(
       /hex string expected,.*/,
     );
   });
diff --git a/src/sign.ts b/src/events/sign.ts
similarity index 87%
rename from src/sign.ts
rename to src/events/sign.ts
index 0089ea2..e261ed5 100644
--- a/src/sign.ts
+++ b/src/events/sign.ts
@@ -2,7 +2,7 @@ import { sha256 } from "@noble/hashes/sha2.js";
 import { bytesToHex, hexToBytes } from "@noble/hashes/utils.js";
 import { schnorr } from "@noble/secp256k1";
 
-import "./crypto_init";
+import "../crypto_init";
 
 /**
  * Generates a Schnorr signature for the given event ID using the provided private key.
@@ -12,7 +12,7 @@ import "./crypto_init";
  * @throws {MalformedIDError} If event ID is not 64 hex characters
  * @throws {MalformedPrivKeyError} If private key is not 64 lowercase hex characters
  */
-function sign(eventID: string, privateKey: string): string {
+export function sign(eventID: string, privateKey: string): string {
   const privateKeyBytes = hexToBytes(privateKey);
   const idBytes = hexToBytes(eventID);
 
@@ -20,7 +20,3 @@ function sign(eventID: string, privateKey: string): string {
   const signature = schnorr.sign(idBytes, privateKeyBytes, auxRand);
   return bytesToHex(signature);
 }
-
-export const Sign = {
-  sign,
-};
diff --git a/src/validate.test.ts b/src/events/validate.test.ts
similarity index 86%
rename from src/validate.test.ts
rename to src/events/validate.test.ts
index 6f24421..31af23a 100644
--- a/src/validate.test.ts
+++ b/src/events/validate.test.ts
@@ -1,12 +1,17 @@
 import { describe, expect, test } from "vitest";
 
-import type { EventData } from "./types";
-import { testEvent, testPK } from "./util.test";
-import { Validate } from "./validate";
+import { testEvent, testPK } from "../util.test";
+import type { Event } from "./event";
+import {
+  validate,
+  validateID,
+  validateSignature,
+  validateStructure,
+} from "./validate";
 
 interface ValidateEventTestCase {
   name: string;
-  event: EventData;
+  event: Event;
   expectedError: string;
 }
 
@@ -114,33 +119,31 @@ const structureTestCases: ValidateEventTestCase[] = [
 
 describe("EventValidation.validateStructure", () => {
   test.each(structureTestCases)("$name", ({ event, expectedError }) => {
-    expect(() => Validate.validateStructure(event)).toThrow(expectedError);
+    expect(() => validateStructure(event)).toThrow(expectedError);
   });
 });
 
 describe("EventValidation.validateID", () => {
   test("detects ID mismatch", () => {
-    const event: EventData = {
+    const event: Event = {
       ...testEvent,
       id: "7f661c2a3c1ed67dc959d6cd968d743d5e6e334313df44724bca939e2aa42c9e",
     };
-    expect(() => Validate.validateID(event)).toThrow(
-      "does not match computed id",
-    );
+    expect(() => validateID(event)).toThrow("does not match computed id");
   });
 });
 
 describe("EventValidation.validateSignature", () => {
   test("accepts valid signature", () => {
-    expect(() => Validate.validateSignature(testEvent)).not.toThrow();
+    expect(() => validateSignature(testEvent)).not.toThrow();
   });
 
   test("rejects invalid signature", () => {
-    const event: EventData = {
+    const event: Event = {
       ...testEvent,
       sig: "9e43cbcf7e828a21c53fa35371ee79bffbfd7a3063ae46fc05ec623dd3186667c57e3d006488015e19247df35eb41c61013e051aa87860e23fa5ffbd44120482",
     };
-    expect(() => Validate.validateSignature(event)).toThrow(
+    expect(() => validateSignature(event)).toThrow(
       "event signature is invalid",
     );
   });
@@ -196,15 +199,15 @@ describe("EventValidation.validateSignature - malformed inputs", () => {
   test.each(validateSignatureTestCases)(
     "$name",
     ({ id, sig, pubkey, expectedError }) => {
-      const event: EventData = { ...testEvent, id, sig, pubkey };
-      expect(() => Validate.validateSignature(event)).toThrow(expectedError);
+      const event: Event = { ...testEvent, id, sig, pubkey };
+      expect(() => validateSignature(event)).toThrow(expectedError);
     },
   );
 });
 
 describe("EventValidation.validate", () => {
   test("validates complete event", () => {
-    const event: EventData = {
+    const event: Event = {
       id: "c9a0f84fcaa889654da8992105eb122eb210c8cbd58210609a5ef7e170b51400",
       pubkey: testPK,
       created_at: testEvent.created_at,
@@ -216,6 +219,6 @@ describe("EventValidation.validate", () => {
       content: "valid event",
       sig: "668a715f1eb983172acf230d17bd283daedb2598adf8de4290bcc7eb0b802fdb60669d1e7d1104ac70393f4dbccd07e8abf897152af6ce6c0a75499874e27f14",
     };
-    expect(() => Validate.validate(event)).not.toThrow();
+    expect(() => validate(event)).not.toThrow();
   });
 });
diff --git a/src/validate.ts b/src/events/validate.ts
similarity index 80%
rename from src/validate.ts
rename to src/events/validate.ts
index 4b21eab..149a575 100644
--- a/src/validate.ts
+++ b/src/events/validate.ts
@@ -1,8 +1,8 @@
 import { hexToBytes } from "@noble/hashes/utils.js";
 import { schnorr } from "@noble/secp256k1";
 
-import { HEX_64_PATTERN, HEX_128_PATTERN } from "./constants";
-import "./crypto_init";
+import { HEX_64_PATTERN, HEX_128_PATTERN } from "../constants";
+import "../crypto_init";
 import {
   FailedIDCompError,
   InvalidSigError,
@@ -11,9 +11,9 @@ import {
   MalformedSigError,
   MalformedTagError,
   NoEventIDError,
-} from "./errors";
-import { EventID } from "./id";
-import type { EventData } from "./types";
+} from "../errors";
+import type { Event } from "./event";
+import { getID } from "./id";
 
 /**
  * Checks event field formats and lengths conform to protocol specification.
@@ -22,7 +22,7 @@ import type { EventData } from "./types";
  * @throws {MalformedSigError} If sig is not 128 hex characters
  * @throws {MalformedTagError} If any tag has fewer than 2 elements
  */
-function validateStructure(event: EventData): void {
+export function validateStructure(event: Event): void {
   if (!HEX_64_PATTERN.test(event.pubkey)) {
     throw new MalformedPubKeyError();
   }
@@ -48,10 +48,10 @@ function validateStructure(event: EventData): void {
  * @throws {NoEventIDError} If event.id is empty
  * @throws {Error} If computed ID does not match stored ID
  */
-function validateID(event: EventData): void {
+export function validateID(event: Event): void {
   let computedID: string;
   try {
-    computedID = EventID.getID(event);
+    computedID = getID(event);
   } catch (err) {
     throw new FailedIDCompError();
   }
@@ -71,7 +71,7 @@ function validateID(event: EventData): void {
  * Verifies the cryptographic signature using Schnorr verification.
  * @throws {InvalidSigError} If signature verification fails
  */
-function validateSignature(event: EventData): void {
+export function validateSignature(event: Event): void {
   const idBytes = hexToBytes(event.id);
   const sigBytes = hexToBytes(event.sig);
   const pubkeyBytes = hexToBytes(event.pubkey);
@@ -87,15 +87,8 @@ function validateSignature(event: EventData): void {
  * Performs complete event validation: structure, ID, and signature.
  * @throws First validation error encountered
  */
-function validate(event: EventData): void {
+export function validate(event: Event): void {
   validateStructure(event);
   validateID(event);
   validateSignature(event);
 }
-
-export const Validate = {
-  validate,
-  validateStructure,
-  validateID,
-  validateSignature,
-};
diff --git a/src/filter.test.ts b/src/filter.test.ts
deleted file mode 100644
index 31d1451..0000000
--- a/src/filter.test.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import { test } from "vitest";
-
-test("placeholder", () => {});
diff --git a/src/filter.ts b/src/filter.ts
deleted file mode 100644
index c399fab..0000000
--- a/src/filter.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { FilterJSON } from "./filter_json";
-import { FilterMatch } from "./filter_match";
-
-export const Filter = {
-  ...FilterMatch,
-  ...FilterJSON,
-};
diff --git a/src/types.ts b/src/filters/filter.ts
similarity index 55%
rename from src/types.ts
rename to src/filters/filter.ts
index 17b626e..47253a1 100644
--- a/src/types.ts
+++ b/src/filters/filter.ts
@@ -1,24 +1,3 @@
-/**
- * Tag represents a single tag within an event as an array of strings.
- * The first element identifies the tag name, the second contains the value,
- * and subsequent elements are optional.
- */
-export type Tag = string[];
-
-/**
- * EventData represents a Nostr protocol event with its seven required fields.
- * All fields must be present for a valid event.
- */
-export interface EventData {
-  id: string;
-  pubkey: string;
-  created_at: number;
-  kind: number;
-  tags: Tag[];
-  content: string;
-  sig: string;
-}
-
 /**
  * TagFilters maps tag names to arrays of values for tag-based filtering.
  * Keys correspond to tag names without the "#" prefix.
@@ -36,10 +15,10 @@ export interface FilterExtensions {
 }
 
 /**
- * FilterData defines subscription criteria for events.
+ * Filter defines subscription criteria for events.
  * All conditions within a filter are applied with AND logic.
  */
-export interface FilterData {
+export interface Filter {
   ids?: string[] | null;
   authors?: string[] | null;
   kinds?: number[] | null;
diff --git a/src/filter_json.test.ts b/src/filters/filter_json.test.ts
similarity index 95%
rename from src/filter_json.test.ts
rename to src/filters/filter_json.test.ts
index 227db31..7751fc3 100644
--- a/src/filter_json.test.ts
+++ b/src/filters/filter_json.test.ts
@@ -1,23 +1,23 @@
 import { describe, expect, test } from "vitest";
 
-import { FilterJSON } from "./filter_json";
-import type { FilterData } from "./types";
+import type { Filter } from "./filter";
+import { fromJSON, toJSON } from "./filter_json";
 
 interface FilterMarshalTestCase {
   name: string;
-  filter: FilterData;
+  filter: Filter;
   expected: string;
 }
 
 interface FilterUnmarshalTestCase {
   name: string;
   input: string;
-  expected: FilterData;
+  expected: Filter;
 }
 
 interface FilterRoundTripTestCase {
   name: string;
-  filter: FilterData;
+  filter: Filter;
 }
 
 const marshalTestCases: FilterMarshalTestCase[] = [
@@ -447,31 +447,31 @@ const roundTripTestCases: FilterRoundTripTestCase[] = [
   },
 ];
 
-describe("FilterJSON.toJSON", () => {
+describe("toJSON", () => {
   test.each(marshalTestCases)("$name", ({ filter, expected }) => {
-    const result = JSON.stringify(FilterJSON.toJSON(filter));
+    const result = JSON.stringify(toJSON(filter));
     const expectedObj = JSON.parse(expected);
     const actualObj = JSON.parse(result);
     expect(actualObj).toEqual(expectedObj);
   });
 });
 
-describe("FilterJSON.fromJSON", () => {
+describe("fromJSON", () => {
   test.each(unmarshalTestCases)("$name", ({ input, expected }) => {
-    const result = FilterJSON.fromJSON(JSON.parse(input));
+    const result = fromJSON(JSON.parse(input));
     expectEqualFilters(result, expected);
   });
 });
 
 describe("FilterJSON round trip", () => {
   test.each(roundTripTestCases)("$name", ({ filter }) => {
-    const jsonBytes = JSON.stringify(FilterJSON.toJSON(filter));
-    const result = FilterJSON.fromJSON(JSON.parse(jsonBytes));
+    const jsonBytes = JSON.stringify(toJSON(filter));
+    const result = fromJSON(JSON.parse(jsonBytes));
     expectEqualFilters(result, filter);
   });
 });
 
-function expectEqualFilters(got: FilterData, want: FilterData): void {
+function expectEqualFilters(got: Filter, want: Filter): void {
   expect(got.ids).toEqual(want.ids);
   expect(got.authors).toEqual(want.authors);
   expect(got.kinds).toEqual(want.kinds);
diff --git a/src/filter_json.ts b/src/filters/filter_json.ts
similarity index 91%
rename from src/filter_json.ts
rename to src/filters/filter_json.ts
index ebf0236..38c709c 100644
--- a/src/filter_json.ts
+++ b/src/filters/filter_json.ts
@@ -1,10 +1,10 @@
-import type { FilterData, FilterExtensions, TagFilters } from "./types";
+import type { Filter, TagFilters } from "./filter";
 
 /**
  * Converts a filter to a plain object suitable for JSON.stringify().
  * Merges standard fields, tag filters (prefixed with #), and extensions.
  */
-function toJSON(filter: FilterData): object {
+export function toJSON(filter: Filter): object {
   const output: Record<string, any> = {};
 
   // Standard fields
@@ -46,8 +46,8 @@ function toJSON(filter: FilterData): object {
  * Parses a filter from JSON data.
  * Separates standard fields, tag filters (keys starting with #), and extensions.
  */
-function fromJSON(json: any): FilterData {
-  const filter: FilterData = {};
+export function fromJSON(json: any): Filter {
+  const filter: Filter = {};
   const remaining: Record<string, any> = { ...json };
 
   // Extract standard fields
@@ -96,8 +96,3 @@ function fromJSON(json: any): FilterData {
 
   return filter;
 }
-
-export const FilterJSON = {
-  toJSON,
-  fromJSON,
-};
diff --git a/src/filter_match.test.ts b/src/filters/filter_match.test.ts
similarity index 94%
rename from src/filter_match.test.ts
rename to src/filters/filter_match.test.ts
index e6f0712..a4ead54 100644
--- a/src/filter_match.test.ts
+++ b/src/filters/filter_match.test.ts
@@ -1,16 +1,17 @@
 import { readFileSync } from "fs";
 import { describe, expect, test } from "vitest";
 
-import { FilterMatch } from "./filter_match";
-import type { EventData, FilterData } from "./types";
+import type { Event } from "../events";
+import type { Filter } from "./filter";
+import { matches } from "./filter_match";
 
-const testEvents: EventData[] = JSON.parse(
+const testEvents: Event[] = JSON.parse(
   readFileSync("src/testdata/test_events.json", "utf-8"),
 );
 
 interface FilterTestCase {
   name: string;
-  filter: FilterData;
+  filter: Filter;
   expectedIDs: string[];
 }
 
@@ -365,19 +366,19 @@ const filterTestCases: FilterTestCase[] = [
   },
 ];
 
-describe("FilterMatch.matches", () => {
+describe("matches", () => {
   test.each(filterTestCases)("$name", ({ filter, expectedIDs }) => {
     const actualIDs = testEvents
-      .filter((event) => FilterMatch.matches(filter, event))
+      .filter((event) => matches(filter, event))
       .map((event) => event.id.slice(0, 8));
 
     expect(actualIDs).toEqual(expectedIDs);
   });
 });
 
-describe("FilterMatch.matches - skip malformed tags", () => {
+describe("matches - skip malformed tags", () => {
   test("skips malformed tags during tag matching", () => {
-    const event: EventData = {
+    const event: Event = {
       id: "test",
       pubkey: "test",
       created_at: 0,
@@ -386,10 +387,10 @@ describe("FilterMatch.matches - skip malformed tags", () => {
       content: "",
       sig: "test",
     };
-    const filter: FilterData = {
+    const filter: Filter = {
       tags: { valid: ["value"] },
     };
 
-    expect(FilterMatch.matches(filter, event)).toBe(true);
+    expect(matches(filter, event)).toBe(true);
   });
 });
diff --git a/src/filter_match.ts b/src/filters/filter_match.ts
similarity index 93%
rename from src/filter_match.ts
rename to src/filters/filter_match.ts
index c65bbad..e25ae5d 100644
--- a/src/filter_match.ts
+++ b/src/filters/filter_match.ts
@@ -1,4 +1,5 @@
-import type { EventData, FilterData, Tag, TagFilters } from "./types";
+import type { Event, Tag } from "../events";
+import type { Filter, TagFilters } from "./filter";
 
 /**
  * Returns true if candidate starts with any prefix in the list.
@@ -76,7 +77,7 @@ function matchesTags(eventTags: Tag[], tagFilters: TagFilters): boolean {
  * Returns true if the event satisfies all filter conditions (AND logic).
  * Does not account for custom extensions.
  */
-function matches(filter: FilterData, event: EventData): boolean {
+export function matches(filter: Filter, event: Event): boolean {
   // Check ID prefixes
   if (filter.ids && filter.ids.length > 0) {
     if (!matchesPrefix(event.id, filter.ids)) {
@@ -112,7 +113,3 @@ function matches(filter: FilterData, event: EventData): boolean {
 
   return true;
 }
-
-export const FilterMatch = {
-  matches,
-};
diff --git a/src/filters/index.ts b/src/filters/index.ts
new file mode 100644
index 0000000..1018b57
--- /dev/null
+++ b/src/filters/index.ts
@@ -0,0 +1,3 @@
+export * from "./filter";
+export * from "./filter_json";
+export * from "./filter_match";
diff --git a/src/index.test.js b/src/index.test.js
deleted file mode 100644
index 15ea7c6..0000000
--- a/src/index.test.js
+++ /dev/null
@@ -1,52 +0,0 @@
-import { describe, expect, test } from "vitest";
-
-import * as Roots from "./index";
-
-describe("Package Exports", () => {
-  test("exports type definitions", () => {
-    // Types aren't runtime values, but we can check the module has them
-    expect(Roots).toBeDefined();
-  });
-
-  test("exports constants", () => {
-    expect(Roots.HEX_64_PATTERN).toBeDefined();
-    expect(Roots.HEX_128_PATTERN).toBeDefined();
-  });
-
-  test("exports error classes", () => {
-    expect(Roots.MalformedPubKeyError).toBeDefined();
-    expect(Roots.MalformedPrivKeyError).toBeDefined();
-    expect(Roots.MalformedIDError).toBeDefined();
-    expect(Roots.MalformedSigError).toBeDefined();
-    expect(Roots.MalformedTagError).toBeDefined();
-    expect(Roots.FailedIDCompError).toBeDefined();
-    expect(Roots.NoEventIDError).toBeDefined();
-    expect(Roots.InvalidSigError).toBeDefined();
-  });
-
-  test("exports Keys namespace", () => {
-    expect(Roots.Keys).toBeDefined();
-    expect(Roots.Keys.generatePrivateKey).toBeTypeOf("function");
-    expect(Roots.Keys.getPublicKey).toBeTypeOf("function");
-  });
-
-  test("exports Event namespace", () => {
-    expect(Roots.Event).toBeDefined();
-    expect(Roots.Event.serialize).toBeTypeOf("function");
-    expect(Roots.Event.getID).toBeTypeOf("function");
-    expect(Roots.Event.sign).toBeTypeOf("function");
-    expect(Roots.Event.validate).toBeTypeOf("function");
-    expect(Roots.Event.validateStructure).toBeTypeOf("function");
-    expect(Roots.Event.validateID).toBeTypeOf("function");
-    expect(Roots.Event.validateSignature).toBeTypeOf("function");
-    expect(Roots.Event.toJSON).toBeTypeOf("function");
-    expect(Roots.Event.fromJSON).toBeTypeOf("function");
-  });
-
-  test("exports Filter namespace", () => {
-    expect(Roots.Filter).toBeDefined();
-    expect(Roots.Filter.matches).toBeTypeOf("function");
-    expect(Roots.Filter.toJSON).toBeTypeOf("function");
-    expect(Roots.Filter.fromJSON).toBeTypeOf("function");
-  });
-});
diff --git a/src/index.ts b/src/index.ts
deleted file mode 100644
index 93fe81e..0000000
--- a/src/index.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-export * from "./types";
-export * from "./constants";
-export * from "./errors";
-export { Event } from "./event";
-export { Filter } from "./filter";
-export { Keys } from "./keys";
diff --git a/src/keys/index.ts b/src/keys/index.ts
new file mode 100644
index 0000000..4de510b
--- /dev/null
+++ b/src/keys/index.ts
@@ -0,0 +1 @@
+export * from "./keys";
diff --git a/src/keys.test.ts b/src/keys/keys.test.ts
similarity index 54%
rename from src/keys.test.ts
rename to src/keys/keys.test.ts
index 7aaafbf..f03026e 100644
--- a/src/keys.test.ts
+++ b/src/keys/keys.test.ts
@@ -1,37 +1,35 @@
 import { describe, expect, test } from "vitest";
 
-import { HEX_64_PATTERN } from "./constants";
-import { Keys } from "./keys";
-import { testPK, testSK } from "./util.test";
+import { HEX_64_PATTERN } from "../constants";
+import { testPK, testSK } from "../util.test";
+import { generatePrivateKey, getPublicKey } from "./keys";
 
-describe("Keys.generatePrivate", () => {
+describe("generatePrivate", () => {
   test("returns 64 hex characters", () => {
-    const privateKey = Keys.generatePrivateKey();
+    const privateKey = generatePrivateKey();
     expect(privateKey).toMatch(HEX_64_PATTERN);
   });
 
   test("generates unique keys", () => {
-    const key1 = Keys.generatePrivateKey();
-    const key2 = Keys.generatePrivateKey();
+    const key1 = generatePrivateKey();
+    const key2 = generatePrivateKey();
     expect(key1).not.toBe(key2);
   });
 });
 
-describe("Keys.getPublic", () => {
+describe("getPublic", () => {
   test("derives correct public key", () => {
-    const publicKey = Keys.getPublicKey(testSK);
+    const publicKey = getPublicKey(testSK);
     expect(publicKey).toBe(testPK);
   });
 
   test("throws on invalid private key - too short", () => {
-    expect(() => Keys.getPublicKey("abc123")).toThrow(
-      /"secret key" expected.*/,
-    );
+    expect(() => getPublicKey("abc123")).toThrow(/"secret key" expected.*/);
   });
 
   test("throws on invalid private key - non-hex", () => {
     expect(() =>
-      Keys.getPublicKey(
+      getPublicKey(
         "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz",
       ),
     ).toThrow(/hex string expected,.*/);
diff --git a/src/keys.ts b/src/keys/keys.ts
similarity index 82%
rename from src/keys.ts
rename to src/keys/keys.ts
index e2622e6..7529ee7 100644
--- a/src/keys.ts
+++ b/src/keys/keys.ts
@@ -5,7 +5,7 @@ import { schnorr } from "@noble/secp256k1";
  * Generates a new random secp256k1 private key.
  * @returns 64-character lowercase hexadecimal string
  */
-function generatePrivateKey(): string {
+export function generatePrivateKey(): string {
   const { secretKey } = schnorr.keygen();
   return bytesToHex(secretKey);
 }
@@ -16,14 +16,9 @@ function generatePrivateKey(): string {
  * @returns 64-character lowercase hexadecimal public key (x-coordinate only)
  * @throws {MalformedPrivKeyError} If private key is not 64 lowercase hex characters
  */
-function getPublicKey(privateKey: string): string {
+export function getPublicKey(privateKey: string): string {
   const privateKeyBytes = hexToBytes(privateKey);
   const publicKeyBytes = schnorr.getPublicKey(privateKeyBytes);
 
   return bytesToHex(publicKeyBytes);
 }
-
-export const Keys = {
-  generatePrivateKey,
-  getPublicKey,
-};
diff --git a/src/util.test.ts b/src/util.test.ts
index c05524f..bd0719f 100644
--- a/src/util.test.ts
+++ b/src/util.test.ts
@@ -1,6 +1,6 @@
 import { test } from "vitest";
 
-import type { EventData } from "./types";
+import type { Event } from "./events";
 
 test("placeholder", () => {});
 
@@ -9,7 +9,7 @@ export const testSK =
 export const testPK =
   "cfa87f35acbde29ba1ab3ee42de527b2cad33ac487e80cf2d6405ea0042c8fef";
 
-export const testEvent: EventData = {
+export const testEvent: Event = {
   id: "c7a702e6158744ca03508bbb4c90f9dbb0d6e88fefbfaa511d5ab24b4e3c48ad",
   pubkey: testPK,
   created_at: 1760740551,