basic code examples

utils/api-scripts/src/create-account.ts

@@ -0,0 +1,28 @@
+// @ts-check
+import { cryptoWaitReady, mnemonicGenerate } from '@polkadot/util-crypto'
+import { Keyring } from '@polkadot/keyring'
+
+async function main() {
+  await cryptoWaitReady()
+
+  // https://polkadot.js.org/docs/keyring/start/create
+  const keyring = new Keyring({
+    type: 'sr25519',
+    ss58Format: 126,
+  })
+
+  // Generate a new mnemonic
+  const mnemonic = mnemonicGenerate()
+
+  const keyringPair = keyring.addFromMnemonic(
+    mnemonic,
+    {
+      name: 'User 1',
+    },
+    'sr25519'
+  )
+
+  console.log(keyringPair.address)
+}
+
+main().catch(console.error)

utils/api-scripts/src/create-signed-transfer-tx.ts

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+import { ApiPromise, WsProvider } from '@polkadot/api'
+import { cryptoWaitReady } from '@polkadot/util-crypto'
+import { Keyring } from '@polkadot/keyring'
+import { BN } from '@polkadot/util'
+
+async function main() {
+  await cryptoWaitReady()
+
+  // Initialise the provider to connect to the local node
+  const provider = new WsProvider('wss://rpc.joystream.org')
+
+  // Create the API and wait until ready
+  const api = await ApiPromise.create({ provider })
+
+  const keyring = new Keyring({ type: 'sr25519', ss58Format: 126 })
+
+  const keyringPair = keyring.addFromMnemonic('your mnemonic phrase', {}, 'sr25519')
+
+  // Create a transfer transaction
+  const OneJoy = new BN(10000000000)
+  const tx = api.tx.balances.transfer('j4W34M9gBApzi8Sj9nXSSHJmv3UHnGKecyTFjLGnmxtJDi98L', OneJoy)
+
+  // Get the next account nonce
+  const nonce = await api.rpc.system.accountNextIndex(keyringPair.address)
+
+  // We do not need the provider anymore, close it.
+  await api.disconnect()
+
+  // Sign the transaction
+  const signedTx = tx.sign(keyringPair, { nonce })
+
+  // Paste the hex here to decode it.
+  // https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.joystream.org#/extrinsics/decode
+  // hex is the signed transaction which can be submitted to the network
+  console.log(signedTx.toHex())
+}
+
+main().catch(console.error)