"Error: Unknown message digest" when using crypto.subtle.verify({'name':'ECDSA', 'hash':'SHA-256'}, ...)

I'm trying to bundle the PageSigner [pgsg-node.js](https://github.com/tlsnotary/pagesigner/blob/master/webextension/content/pgsg-node/pgsg-node.js) (written in NodeJS) using browserify, such that I can run it via QuickJS and eventually compile it to WASM. (Not for a browser application however - I need to run it on a WASM VM).

After some necessary edits to the code of pgsg-node.js, I managed to successfully execute both `node bundle.js` and the QuickJS analogue `qjs bundle.js` and log the final output to the console. However, that only works if I remove [this crucial line](https://github.com/tlsnotary/pagesigner/blob/4e437d0be7ef91af3beb156a81a4aade1d20c1b1/webextension/content/tlsn.js#L634):

```
var result = await crypto.subtle.verify({'name':'ECDSA', 'hash':'SHA-256'}, notary_pk_CryptoKey, ba2ab(sig_p1363), ba2ab(signed_data_ba))
```

and replace it with `var result = true`. Otherwise I get the following error after executing `node bundle.js`:

```
Error: Unknown message digest
at new Verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:13849:20)
at Object.createVerify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:13882:10)
at Function.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:33318:51)
at EcdsaProvider.onVerify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:33496:25)
at EcdsaProvider.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:82175:30)
at SubtleCrypto.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:82832:39)
at verifyNotarySig (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:2724:39)
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async verifyPgsgV4 (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:723:10)
at async Object.verifyPgsg (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:661:12) Error
(node:7830) UnhandledPromiseRejectionWarning: Error: Unknown message digest
at new Verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:13849:20)
at Object.createVerify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:13882:10)
at Function.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:33318:51)
at EcdsaProvider.onVerify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:33496:25)
at EcdsaProvider.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:82175:30)
at SubtleCrypto.verify (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:82832:39)
at verifyNotarySig (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:2724:39)
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async verifyPgsgV4 (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:723:10)
at async Object.verifyPgsg (/home/metzgerj/CoaseContract/pagesigner/webextension/content/pgsg-node/bundle.js:661:12)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:7830) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:7830) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
```

What's weird is that at least some of the `crypto.subtle` functionality works, the[ line right before](https://github.com/tlsnotary/pagesigner/blob/4e437d0be7ef91af3beb156a81a4aade1d20c1b1/webextension/content/tlsn.js#L632)
```
var notary_pk_CryptoKey = await crypto.subtle.importKey(
"raw", ba2ab(notaryPubkey_ba), {name: 'ECDSA', namedCurve:'P-256'}, true, ["verify"]);
```
works flawlessly. Also, executing my modified unbundled file `node pgsg-node.js` does not produce this error.