Version: Current

Mithril client library WASM

info

Mithril client library WASM can be used by Javascript developers to use the Mithril network in their web applications.

It is responsible for handling the different types of data certified by Mithril and available through a Mithril aggregator:

Snapshot: list and get
Mithril stake distribution: list and get
Cardano transaction: list and get snapshots, get proofs
Cardano stake distribution: list, get and get by epoch
Certificate: list, get, and chain validation.

tip

For more information about the Mithril network, please see the architecture overview.

info

The Mithril network configurations are available in the Network configurations section of the user manual.

Resources

Node	Source repository	Rust documentation	Network configurations
Mithril client WASM	↗️	↗️	↗️

Installation

The Mithril client library is compatible with the following browsers:

Browser	Minimum version	Released	Tested in CI
Chrome	`54`	2016-10-12	✔️
Edge	`79`	2020-01-15	-
Firefox	`38`	2015-05-12	✔️
Opera	`41`	2016-10-25	-
Safari	`15.4`	2022-03-14	-
Chrome Android	`54`	2016-10-19	-
Firefox for Android	`38`	2015-05-12	-
Opera Android	`41`	2016-10-25	-
Safari on iOS	`15.4`	2022-03-14	-

In your Javascript project, use npm to add mithril-client-wasm library as a dependency:

npm i @mithril-dev/mithril-client-wasm

Using Mithril client library

Below is a basic example of how to use most of the functions exposed by the Mithril client library:

import initMithrilClient, {
  MithrilClient,
} from "@mithril-dev/mithril-client-wasm";

let aggregator_endpoint =
  "https://aggregator.testing-preview.api.mithril.network/aggregator";
let genesis_verification_key =
  "5b3132372c37332c3132342c3136312c362c3133372c3133312c3231332c3230372c3131372c3139382c38352c3137362c3139392c3136322c3234312c36382c3132332c3131392c3134352c31332c3233322c3234332c34392c3232392c322c3234392c3230352c3230352c33392c3233352c34345d";

const broadcast_channel = new BroadcastChannel("mithril-client");
broadcast_channel.onmessage = (e) => {
  let event = e.data;
  if (event.type == "CertificateChainValidationStarted") {
    console.log("The certificate chain validation has started");
  } else if (event.type == "CertificateValidated") {
    console.log(
      "A certificate has been validated, certificate_hash: " +
        event.payload.certificate_hash,
    );
  } else if (event.type == "CertificateChainValidated") {
    console.log("The certificate chain is valid");
  } else {
    console.log(event);
  }
};

await initMithrilClient();

let client = new MithrilClient(aggregator_endpoint, genesis_verification_key, {
  // The following option activates the unstable features of the client.
  // Unstable features will trigger an error if this option is not set.
  unstable: true,
});
let mithril_stake_distributions_list =
  await client.list_mithril_stake_distributions();
console.log("stake distributions:", mithril_stake_distributions_list);

let last_mithril_stake_distribution = mithril_stake_distributions_list[0];
console.log(
  "last_mithril_stake_distribution:",
  last_mithril_stake_distribution,
);

let last_stake_distribution = await client.get_mithril_stake_distribution(
  last_mithril_stake_distribution.hash,
);
console.log("last_stake_distribution:", last_stake_distribution);

let certificate = await client.get_mithril_certificate(
  last_stake_distribution.certificate_hash,
);
console.log("certificate:", certificate);

let last_certificate_from_chain = await client.verify_certificate_chain(
  certificate.hash,
);
console.log(
  "verify certificate chain OK, last_certificate_from_chain:",
  last_certificate_from_chain,
);

let mithril_stake_distributions_message =
  await client.compute_mithril_stake_distribution_message(
    last_stake_distribution,
  );
console.log(
  "mithril_stake_distributions_message:",
  mithril_stake_distributions_message,
);

let valid_stake_distribution_message =
  await client.verify_message_match_certificate(
    mithril_stake_distributions_message,
    last_certificate_from_chain,
  );
console.log(
  "valid_stake_distribution_message:",
  valid_stake_distribution_message,
);

Adding Custom HTTP Headers

You can customize the HTTP headers sent by the Mithril client. This is particularly useful in scenarios where the Mithril client is used with a proxy, as it allows you to include headers like Authorization or custom headers for specific use cases. Below is an example of how to set custom headers:

let http_headers_map = new Map();
http_headers_map.set("Authorization", "Bearer YourBearerToken");
http_headers_map.set("X-Custom-Header", "YourCustomHeaderValue");

let client_options = {
  http_headers: http_headers_map,
};

let client = new MithrilClient(
  aggregator_endpoint,
  genesis_verification_key,
  client_options,
);

If the aggregator signs CardanoTransactions, you can add the code below to the previous example:

tip

You can verify that the aggregator signs CardanoTransactions by running the command below:

wget -q -O - YOUR_AGGREGATOR_ENDPOINT | jq '.capabilities.signed_entity_types | contains(["CardanoTransactions"])'

For example with the aggregator on pre-release-preview Mithril network:

wget -q -O - https://aggregator.pre-release-preview.api.mithril.network/aggregator | jq '.capabilities.signed_entity_types | contains(["CardanoTransactions"])'

const proof = await client.get_cardano_transaction_proofs([
  "CARDANO_TRANSACTION_HASH_1",
  "CARDANO_TRANSACTION_HASH_2",
]);
console.log("Proof tx hash", proof.transactions_hashes);
console.log("Proof certificate hash", proof.certificate_hash);

let proof_certificate = await client.verify_certificate_chain(
  proof.certificate_hash,
);
console.log(
  "verify_certificate_chain OK, last_certificate_from_chain:",
  proof_certificate,
);

let valid_cardano_transaction_proof =
  await client.verify_cardano_transaction_proof_then_compute_message(
    proof,
    proof_certificate,
  );
console.log(
  "valid_cardano_transaction_proof:",
  valid_cardano_transaction_proof,
);

With the same logic as above, if the aggregator signs CardanoStakeDistribution, you can add the code below to the previous example:

tip

You can verify that the aggregator signs CardanoStakeDistribution by running the command below:

wget -q -O - YOUR_AGGREGATOR_ENDPOINT | jq '.capabilities.signed_entity_types | contains(["CardanoStakeDistribution"])'

For example, with the aggregator on the testing-preview Mithril network:

wget -q -O - https://aggregator.testing-preview.api.mithril.network/aggregator | jq '.capabilities.signed_entity_types | contains(["CardanoStakeDistribution"])'

let cardano_stake_distributions_list =
  await client.list_cardano_stake_distributions();
console.log("cardano stake distributions:", cardano_stake_distributions_list);

let last_cardano_stake_distribution =
  await client.get_cardano_stake_distribution(
    cardano_stake_distributions_list[0].hash,
  );
console.log(
  "last_cardano_stake_distribution:",
  last_cardano_stake_distribution,
);

let certificate = await client.get_mithril_certificate(
  last_cardano_stake_distribution.certificate_hash,
);
console.log("certificate:", certificate);

let last_certificate_from_chain = await client.verify_certificate_chain(
  certificate.hash,
);
console.log(
  "verify certificate chain OK, last_certificate_from_chain:",
  last_certificate_from_chain,
);

let cardano_stake_distribution_message =
  await client.compute_cardano_stake_distribution_message(
    certificate,
    last_cardano_stake_distribution,
  );
console.log(
  "cardano_stake_distribution_message:",
  cardano_stake_distribution_message,
);

let valid_cardano_stake_distribution_message =
  await client.verify_message_match_certificate(
    cardano_stake_distribution_message,
    last_certificate_from_chain,
  );
console.log(
  "valid_cardano_stake_distribution_message:",
  valid_cardano_stake_distribution_message,
);

Resources​

Installation​

Using Mithril client library​

Resources

Installation

Using Mithril client library