javascript-opentimestamp-tools

JS Tools for javascript-opentimestamps.

Test live tools here

Get opentimestamps.js

• download from website opentimestamps.org

<script src="https://opentimestamps.org/assets/javascripts/vendor/opentimestamps.js"></script>

• build sources from javascript-opentimestamps

git clone https://github.com/opentimestamps/javascript-opentimestamps.git
npm install --dev
npm run dist

Stamp

const hashData = "16193782f1d839a08f9fc9a94cec1675f1729db1abc15cf9b57f31aa1724a0ae"
const op = new OpenTimestamps.Ops.OpSHA256()
const detached = OpenTimestamps.DetachedTimestampFile.fromHash(op, hashData)
OpenTimestamps.stamp(detached).then( ()=>{
    const ots = detached.serializeToBytes()
    const hex = bytesToHex(ots)
    console.log(hex)
})

Info

const detached = OpenTimestamps.DetachedTimestampFile.deserialize(ots)
const output = OpenTimestamps.info(detached)
console.log(output)

Upgrade

const detachedOts = OpenTimestamps.DetachedTimestampFile.deserialize(ots)
OpenTimestamps.upgrade(detachedOts).then( (changed) =>{
    if(changed){
        console.log("Timestamp upgraded")
        const upgradedOts = detachedOts.serializeToBytes()
        const upgradedHex = bytesToHex(upgradedOts)
        console.log(upgradedHex)
    } else {
        console.log("Timestamp not changed")
    }
})

Verify

const hashData = "16193782f1d839a08f9fc9a94cec1675f1729db1abc15cf9b57f31aa1724a0ae"
const op = new OpenTimestamps.Ops.OpSHA256()
const detached = OpenTimestamps.DetachedTimestampFile.fromHash(op, hashData)
const detachedOts = OpenTimestamps.DetachedTimestampFile.deserialize(ots)
OpenTimestamps.verify(detachedOts, detached).then( (results)=>{
    if(Object.keys(results).length === 0){
        console.log("Pending attestation");
    }else{
        Object.keys(results).map(chain => {
            var date = moment(results[chain].timestamp * 1000).tz(moment.tz.guess()).format('YYYY-MM-DD z');
            console.log( upperFirstLetter(chain) + ' block ' + results[chain].height + ' attests existence as of ' + date + "\n");
        })
    }
}).catch( err => {
    console.log("Bad attestation" + err);
});