cosmos_sdk 1.4.0

Engage seamlessly with a Cosmos SDK-based network (cosmos hub, osmosis, thor, kujira and etc ... ), enabling the creation, signing, and transmission of transactions. (Beta version)

Dart Cosmos-sdk

Experience effortless interaction with a Cosmos SDK-based network in Dart, facilitating the seamless creation, signing, and transmission of transactions. (Beta version)

*** This version is in beta and requires comprehensive testing for each model implementation. ****

Supported Protocol Buffer packages

• cosmos.auth.v1beta1
• cosmos.authz.v1beta1
• cosmos.bank.v1beta1
• cosmos.base.abci.v1beta1
• cosmos.base.node.v1beta1
• cosmos.base.query.v1beta1
• cosmos.base.reflection.v1beta1
• cosmos.base.tendermint.v1beta1
• cosmos.base.v1beta1
• cosmos.crisis.v1beta1
• cosmos.crypto.ed25519
• cosmos.crypto.multisig.v1beta1
• cosmos.crypto.secp256k1
• cosmos.crypto.secp256r1
• cosmos.distribution.v1beta1
• cosmos.feegrant.v1beta1
• cosmos.genutil.v1beta1
• cosmos.gov.v1beta1
• cosmos.mint.v1beta1
• cosmos.nft.v1beta1
• cosmos.params.v1beta1
• cosmos.slashing.v1beta1
• cosmos.staking.v1beta1
• cosmos.tx.signing.v1beta1
• cosmos.tx.v1beta1
• cosmos.upgrade.module.v1
• cosmos.upgrade.v1beta1
• cosmos.vesting.v1beta1
• cosmos.ics23.v1
• capability.v1
• ibc.applications.fee.v1
• ibc.applications.interchain_accounts.controller.v1
• ibc.applications.interchain_accounts.genesis.v1
• ibc.applications.interchain_accounts.host.v1
• ibc.applications.interchain_accounts.v1
• ibc.applications.transfer.v1
• ibc.applications.transfer.v2
• ibc.core.channel.v1
• ibc.core.client.v1
• ibc.core.commitment.v1
• ibc.core.connection.v1
• ibc.core.types.v1
• ibc.lightclients.localhost.v2
• ibc.lightclients.solomachine.v2
• ibc.lightclients.solomachine.v3
• ibc.lightclients.tendermint.v1
• ibc.lightclients.wasm.v1
• tendermint/tendermint

Example

Transaction

Create and sign transactions related to the Cosmos Hub.

  /// Generating BIP39 seed from mnemonic phrase
  final seedBytes = Bip39SeedGenerator(Mnemonic.fromString(
          "this dove indoor skin shed gap east welcome gift buffalo silent high"))
      .generate();

  /// Deriving hierarchical deterministic (HD) wallet using BIP44
  final bip44 = Bip44.fromSeed(seedBytes, Bip44Coins.cosmos).deriveDefaultPath;
  final pubkey = CosmosSecp256K1PublicKey.fromBytes(bip44.publicKey.compressed);
  final privateKey = CosmosSecp256K1PrivateKey.fromBytes(bip44.privateKey.raw);

// Initializing provider to interact with Tendermint node of Theta testnet
  final provider = TendermintProvider(TendermintHTTPProvider(
      url: "https://rpc.sentry-02.theta-testnet.polypore.xyz"));

  /// Querying account info from the blockchain
  final accountInfo = await provider.request(TendermintRequestAbciQuery(
      request: QueryAccountInfoRequest(pubkey.toAddresss())));

  /// Querying the latest block information
  final latestBlock = await provider.request(
      TendermintRequestAbciQuery(request: const GetLatestBlockRequest()));

  /// Creating authentication info for transaction
  final authInfo = AuthInfo(
      signerInfos: [
        SignerInfo(
            publicKey: pubkey,
            modeInfo: const ModeInfo(ModeInfoSignle(SignMode.signModeDirect)),
            sequence: accountInfo.info.sequence)
      ],
      fee: Fee(amount: [
        Coin(
          denom: "uatom",
          amount: BigInt.from(1000),
        )
      ], gasLimit: BigInt.from(200000)));

  /// Creating a transaction message to send tokens
  final message = MsgSend(
      fromAddress: pubkey.toAddresss(),
      toAddress: CosmosBaseAddress("cosmos1qhslf0sx2fegltfqq0p5j6etmdznjgfnm2j6nc"),
      amount: [Coin(denom: "uatom", amount: BigInt.from(1000000))]);

  /// Creating transaction body with the message
  final txbody = TXBody(messages: [message]);

  /// Creating a signable document for the transaction
  final SignDoc signDoc = SignDoc(
      bodyBytes: txbody.toBuffer(),
      authInfoBytes: authInfo.toBuffer(),
      chainId: latestBlock.block!.header.chainId!,
      accountNumber: accountInfo.info.accountNumber);

  /// Signing the document with the private key
  final sign = privateKey.sign(signDoc.toBuffer());

  /// Creating a raw transaction with body, authentication info, and signature
  final txRaw = TxRaw(
      bodyBytes: txbody.toBuffer(),
      authInfoBytes: authInfo.toBuffer(),
      signatures: [sign]);

  /// Broadcasting the raw transaction to the network
  await provider.request(TendermintRequestBroadcastTxCommit(
      BytesUtils.toHexString(txRaw.toBuffer(), prefix: "0x")));

Address and key managment

Support for Secp256k1, ED25519 and NIST P-256 keys.

  /// Generate seed bytes from a mnemonic
  final seedBytes = Bip39SeedGenerator(Mnemonic.fromString(
          "this dove indoor skin shed gap east welcome gift buffalo silent high"))on
      .generate();

  /// Derive BIP44 path
  final bip44 = Bip44.fromSeed(seedBytes, Bip44Coins.cosmos).deriveDefaultPath;

  /// Create a Cosmos Secp256k1 private key from the derived private key bytes
  final privateKey = CosmosSecp256K1PrivateKey.fromBytes(bip44.privateKey.raw);

  /// Generate the corresponding public key and address for Secp256k1
  final pubkey = CosmosSecp256K1PublicKey.fromBytes(bip44.publicKey.compressed);
  final cosmosAddress = pubkey.toAddresss(hrp: "cosmos");

  /// Sign the provided digest using the Secp256k1 private key
  final sign = privateKey.sign(digest);

  /// Create a Cosmos ED25519 private key from the provided key bytes
  final ed25519PrivateKey = CosmosED25519PrivateKey.fromBytes(keyBytes);

  /// Generate the corresponding public key and address for ED25519
  final edPublicKey = ed25519PrivateKey.toPublicKey();
  final validatorAddr = edPublicKey.toAddresss(hrp: "cosmosvaloper");

  /// Sign the provided digest using the ED25519 private key
  final edSign = ed25519PrivateKey.sign(digest);

  /// Create a Cosmos NIST P-256 private key from the provided key bytes
  final nistPrivateKey = CosmosNist256p1PrivateKey.fromBytes(keyBytes);

  /// Generate the corresponding public key and base address for NIST P-256
  final nistPublicKey = nistPrivateKey.toPublicKey();
  final baseAddress = nistPublicKey.toAddresss();

  /// Sign the provided digest using the NIST P-256 private key
  final nistSign = nistPrivateKey.sign(digest);

JSON-RPC

Support Tendermint RPC.

  /// Define a Tendermint provider with a HTTP URL
  final provider = TendermintProvider(TendermintHTTPProvider(
      url: "https://rpc.sentry-02.theta-testnet.polypore.xyz"));

  /// Query account information using the provider
  final accountInfo = await provider.request(TendermintRequestAbciQuery(
      request: QueryAccountInfoRequest(pubkey.toAddresss())));

  /// Get the latest block information using the provider
  final latestBlock = await provider.request(
      TendermintRequestAbciQuery(request: const GetLatestBlockRequest()));

  /// Broadcast a transaction and wait for a commit using the provider
  final transaction = await provider.request(TendermintRequestBroadcastTxCommit(
      BytesUtils.toHexString(txRaw.toBuffer(), prefix: "0x")));

Contributing

Contributions are welcome! Please follow these guidelines:

• Fork the repository and create a new branch.
• Make your changes and ensure tests pass.
• Submit a pull request with a detailed description of your changes.

Feature requests and bugs

Please file feature requests and bugs in the issue tracker.