add support for v2 hashing algorithm.

update README.md and demo file to be more in sync.
update to v0.10.0.

dist-browser/constants.d.ts

@@ -1 +1 @@
-export declare const __dirname: string;
+export declare const HASH_V2_EPOCH = "2026-07-01T00:00:00Z";

dist-browser/hashTwt.d.ts

@@ -1,2 +1,3 @@
 import { Twt } from './types.ts';
-export default function hashTwt(twt: Twt): string;
+export type HashableTwt = Pick<Twt, "content" | "created" | "url"> & Partial<Omit<Twt, "content" | "created" | "url">>;
+export default function hashTwt(twt: HashableTwt, version?: number): string;

dist-browser/twtxt-lib.js

@@ -2900,6 +2900,7 @@ const base32Encode = (payload) => {
   return encoder.write(payload).finalize();
 };
 const getValueOrFirstEntry = (value) => Array.isArray(value) && value.length ? value[0] : value;
+const HASH_V2_EPOCH = `2026-07-01T00:00:00Z`;
 const dateRegex = /^(\d{4})-(\d{2})-(\d{2})([tT ])(\d{2}):(\d{2}):(\d{2})\.?(\d{3})?(?:(?:([+-]\d{2}):?(\d{2}))|Z)?$/;
 const formatRFC3339 = (date) => {
   const pad = (num = 0) => `${+num < 10 ? 0 : ""}${+num}`;
@@ -2928,10 +2929,14 @@ const formatRFC3339 = (date) => {
     offset
   ].join("");
 };
-function hashTwt(twt) {
+function hashTwt(twt, version = 0) {
   const created = formatRFC3339(twt.created);
   const payload = [twt.url, created, twt.content].join("\n");
-  return base32Encode(blakejsExports.blake2b(payload, void 0, 32)).toLowerCase().slice(-7);
+  const encoded = base32Encode(blakejsExports.blake2b(payload, void 0, 32)).toLowerCase();
+  const createdDate = new Date(twt.created), epochDate = new Date(HASH_V2_EPOCH);
+  if (version === 1 || !version && createdDate < epochDate)
+    return encoded.slice(-7);
+  return encoded.slice(0, 12);
 }
 var dayjs_min$1 = { exports: {} };
 var dayjs_min = dayjs_min$1.exports;