wasm: README/example updates

Co-authored-by: Nadav Ivgi <[email protected]>

Author: jgriffiths

src/wasm_package/README.md

@@ -1,6 +1,6 @@
 # libwally JS
 
-WASM-based JavaScript bindings for [libwally](https://github.com/elementsproject/libwally-core),
+Official Blockstream WASM-based JavaScript bindings for [libwally](https://github.com/elementsproject/libwally-core),
 for nodejs and the browser.
 
 ## Installation
@@ -18,12 +18,12 @@ const word = wally.bip39_get_word(null, 10)
 
 const script = wally.address_to_scriptpubkey("1EMBaSSyxMQPV2fmUsdB7mMfMoocgfiMNw", wally.WALLY_NETWORK_BITCOIN_MAINNET)
 
-const tx = wally.tx_from_hex('020000...', 0)
-console.log(wally.tx_get_txid(tx).toString('hex))
+const tx = wally.tx_from_hex('020000000100000000000000000000000000000000000000000000000000000000000000000000000000fdffffff0101000000000000000000000000', 0)
+console.log(wally.tx_get_txid(tx).toString('hex'))
 wally.tx_free(tx)
 ```
 
 If you're using CommonJS, the module can be loaded asynchronously using `const wally = await import('wallycore')` or `import('wallycore').then(wally => { ... })`.
 
 ## License
-[BSD/MIT](https://github.com/ElementsProject/libwally-core/blob/master/LICENSE)
+[BSD/MIT](https://github.com/ElementsProject/libwally-core/blob/master/LICENSE)