Simon Warta webmaster128

Support for Cosmos SDK Stargate in CosmJS has been ongoing work for several months now. Stargate is released and CosmJS is here to connect to it.

Starting points

Let's explore what is new for Stargate support:

@cosmjs/proto-signing, which implements the new SIGN_MODE_DIRECT based on protobuf serializations
@cosmjs/stargate, which provides a high level client for querying, signing and broadcasting
@cosmjs/cosmwasm-stargate for interacting with CosmWasm smart contracts on Stargate chains

What is Heldernet?

Heldernet is an inofficial name of a Comsmos SDK (Launchpad) based blockchain with the x/wasm module enabled. It is brought to you by the Tendermint Inc. team and spawned for Hackatom V. It is expected to go down after the hackaton. Official resources can be found at the bottom of this site: https://five.hackatom.org/resources.

Confio has committed to co-maintain Heldernet during the hackatom and beyond, for as long as it is useful.

mkdir ptr-null-wasm
cd ptr-null-wasm
cargo init
echo '#[no_mangle] extern "C" fn get_std_ptr_null_value() -> u32 { std::ptr::null::<String>() as u32 }' >> src/main.rs
echo '#[no_mangle] extern "C" fn get_seven() -> u32 { 7 as u32 }' >> src/main.rs
cargo build --target wasm32-unknown-unknown
wasm2wat target/wasm32-unknown-unknown/debug/ptr-null-wasm.wasm | grep -A 6 '(func $get_std_ptr_null_value (type'

So we'll not be using any feature from JSON other than the key/value structure, arrays and nesting. If all we need for signing is a textual representation of the proto document, what about using a protobuf specific text representation as shown by protoc:

$ protoc demo/awesome.proto --decode=awesomepackage.AwesomeMessage < demo/msg1.bin
title: "This is great"
awesome_number: 987654
created {

	recovery param: 1
	message: 5c868fedb8026979ebd26f1ba07c27eedf4ff6d10443505a96ecaf21ba8c4f0937b3cd23ffdc3dd429d4cd1905fb8dbcceeff1350020e18b58d2ba70887baa3a9b783ad30d3fbf210331cdd7df8d77defa398cdacdfc2e359c7ba4cae46bb74401deb417f8b912a1aa966aeeba9c39c7dd22479ae2b30719dca2f2206c5eb4b7
	messageHash (sha256): 5ae8317d34d1e595e3fa7247db80c0af4320cce1116de187f8f7e2e099c0d8d0
	signature: 45c0b7f8c09a9e1f1cea0c25785594427b6bf8f9f878a8af0b1abbb48e16d0920d8becd0c220f67c51217eecfd7184ef0732481c843857e6bc7fc095c4f6b78801
	pubkey: 044a071e8a6e10aada2b8cf39fa3b5fb3400b04e99ea8ae64ceea1a977dbeaf5d5f8c8fbd10b71ab14cd561f7df8eb6da50f8a8d81ba564342244d26d1d4211595
	pubkey compressed: 034a071e8a6e10aada2b8cf39fa3b5fb3400b04e99ea8ae64ceea1a977dbeaf5d5

	recovery param: 1
	message: 17cd4a74d724d55355b6fb2b0759ca095298e3fd1856b87ca1cb2df5409058022736d21be071d820b16dfc441be97fbcea5df787edc886e759475469e2128b22f26b82ca993be6695ab190e673285d561d3b6d42fcc1edd6d12db12dcda0823e9d6079e7bc5ff54cd452dad308d52a15ce9c7edd6ef3dad6a27becd8e001e80f
	m

	[
	{
	"message": "5c868fedb8026979ebd26f1ba07c27eedf4ff6d10443505a96ecaf21ba8c4f0937b3cd23ffdc3dd429d4cd1905fb8dbcceeff1350020e18b58d2ba70887baa3a9b783ad30d3fbf210331cdd7df8d77defa398cdacdfc2e359c7ba4cae46bb74401deb417f8b912a1aa966aeeba9c39c7dd22479ae2b30719dca2f2206c5eb4b7",
	"message_hash": "5ae8317d34d1e595e3fa7247db80c0af4320cce1116de187f8f7e2e099c0d8d0",
	"signature": "207082eb2c3dfa0b454e0906051270ba4074ac93760ba9e7110cd9471475111151eb0dbbc9920e72146fb564f99d039802bf6ef2561446eb126ef364d21ee9c4",
	"pubkey": "04051c1ee2190ecfb174bfe4f90763f2b4ff7517b70a2aec1876ebcfd644c4633fb03f3cfbd94b1f376e34592d9d41ccaf640bb751b00a1fadeb0c01157769eb73"
	},
	{
	"message": "17cd4a74d724d55355b6fb2b0759ca095298e3fd1856b87ca1cb2df5409058022736d21be071d820b16dfc441be97fbcea5df787edc886e759475469e2128b22f26b82ca993be6695ab190e673285d561d3b6d42fcc1edd6d12db12dcda0823e9d6079e7bc5ff54cd452dad308d52a15ce9c7edd6ef3dad6a27becd8e001e80f",
	"message_hash": "586052916fb6f746e1d417766cceffbe1baf95579bab67ad49adda

	// 1 item
	let user = new Person("Susi");

	// 2 items
	let userA = new Person("Susi");
	let userB = new Person("Marc");

	// 3 items
	let users = [
	new Person("Susi"),

	const transactionsCount = 100;
	const nodeUrl = "wss://rpc-private-a-vip-babynet.iov.one";
	const mnemonic = "twin document gold guide asset false rival rib civil squeeze they upper";

	const profile = new UserProfile();
	const signer = new MultiChainSigner(profile);
	const { connection } = await signer.addChain(createBnsConnector(nodeUrl));
	const chainId = connection.chainId();
	const wallet = profile.addWallet(Ed25519HdWallet.fromMnemonic(mnemonic));

	const registrations_count = 3;
	const nodeUrl = "wss://rpc-private-a-vip-catnet.iov.one";
	const mnemonic = "twin document gold guide asset false rival rib civil squeeze they upper";

	const profile = new UserProfile();
	const signer = new MultiChainSigner(profile);
	const { connection } = await signer.addChain(createBnsConnector(nodeUrl));
	const chainId = connection.chainId();
	const wallet = profile.addWallet(Ed25519HdWallet.fromMnemonic(mnemonic));

	{
	"genesis_time": "2019-10-10T08:00:00Z",
	"chain_id": "iov-mainnet",
	"consensus_params": {
	"block": {
	"max_bytes": "500000",
	"max_gas": "-1",
	"time_iota_ms": "1000"
	},
	"evidence": {