# Verify The library can be downloaded here: {{ link }} Full working example can be downloaded here: {{ link }} {% hint style="info" %} This template require http protocol to work properly or you may get a CORS Policy error.\ To test locally, a server (wamp, node server etc) is required to access the index.html through http(s):// and not file:///C:/... {% endhint %} **First, you need to create an html page and include the library call:** ``` ``` **To init the library you need to do the following at the start of your javascript code:** ``` let network = "T" // W for mainnet, T for testnet let Signchain = new window.signchain(network) ``` **HTML EXAMPLE** ``` Verification
School address:
3MvujUZTtoANRzrKYKzx99Vtb9TUh6VPCDm

Verify

``` **JAVASCRIPT EXAMPLE** ``` let network = "T" // W for mainnet, T for testnet let explorerHost = network == "T" ? "https://testnet.wavesexplorer.com" : "https://wavesexplorer.com" let verifyAddress = "3MvujUZTtoANRzrKYKzx99Vtb9TUh6VPCDm" let Signchain = new window.signchain(network) let storeDataVerify = null // ADD THE LISTENER TO YOUR VERIFY INPUT FIELD document.getElementById("selectFileVerify").addEventListener("change", async function (event) { if(event.target.files[0]){ let file = event.target.files[0] await Signchain.hash(file, function (res) { storeDataVerify = res; document.getElementById("fileInfosVerify").innerHTML = "Sha256 file hash: " + storeDataVerify.hash }); }else{ document.getElementById("fileInfosVerify").innerHTML = "" storeDataVerify = null; } }); // ADD VERIFICATION CLICK EVENT ON VERIFY BUTTON document.getElementById("verify").addEventListener("click", async function (e) { let template document.getElementById("resultVerify").innerHTML = "" let checkData = await Signchain.verify(storeDataVerify.hash, verifyAddress) if(checkData.valid){ let certificationDate = JSON.parse(checkData.data[0].value).timestamp template = `
Certification valid and certified on ${new Date(certificationDate)} See on the Blockchain
` }else{ template = `Certification not found` } document.getElementById("resultVerify").innerHTML = template; }) ``` **There is 4 important elements in the HTML example:** ```
``` If you change the identifiants (css ids) of these elements, you will have to also change it in the javascript example. **EDIT THE RESULT** To edit the result, simply change the html of the variable "template" in the javascript example: ``` template = `
Certification valid and certified on ${new Date(certificationDate)} See on the Blockchain
` ```