ots_test_in_browser.js

// include library from https://opentimestamps.org/assets/javascripts/vendor/opentimestamps.min.js
const file = 'Hello World!'
const op = new OpenTimestamps.Ops.OpSHA256()
const enc = new TextEncoder()
const buffer = enc.encode(file)
const detachedTimestamp = OpenTimestamps.DetachedTimestampFile.fromBytes(op, buffer)

OpenTimestamps.stamp(detachedTimestamp).then( ()=>{
	const serializedTimestamp = detachedTimestamp.serializeToBytes()
  const detachedOts = OpenTimestamps.DetachedTimestampFile.deserialize(serializedTimestamp)
  // note that `detachedTimestamp` is equals to `detachedOts`
	console.log(detachedTimestamp)
  console.log(detachedOts)
  const infoResult = OpenTimestamps.info(detachedTimestamp)
  console.log(infoResult)
  const infoResult_ = OpenTimestamps.info(detachedOts)
  console.log(infoResult_)
}).catch(err => {
	console.error(err);
});