> ## Documentation Index
> Fetch the complete documentation index at: https://docs.canton.network/llms.txt
> Use this file to discover all available pages before exploring further.

# 0.19.0

> Wallet SDK 0.19.0 release notes.

# 0.19.0

**Released on December 29th, 2025**

* **Important!: LedgerController constructor has changed to named parameters**

*the `LedgerController` constructor has been refactored from positional parameters to a named parameter object. This is a breaking change
if you construct `LedgerController` directly. The new signature also accepts an optional custom `fetch` implementation which is useful
for routing requests through an intermediary such as the wallet gateway.*

```javascript theme={"theme":{"light":"github-light","dark":"github-dark"}}
// previous constructor
const ledger = new LedgerController(
    userId,
    new URL('http://127.0.0.1:5001'),
    token
)

// new constructor with named params
const ledger = new LedgerController({
    userId,
    baseUrl: new URL('http://127.0.0.1:5001'),
    token,
    // optional: provide a custom fetch to route requests through a proxy
    fetch: myCustomFetch,
})
```

* get created contract by update id

*a new method `getCreatedContractByUpdateId` has been added on the ledger controller. After submitting a transaction you can use the
returned `updateId` to look up the contract(s) that were created as part of that transaction. Optionally you can narrow the result by
providing template or interface ids.*

```javascript theme={"theme":{"light":"github-light","dark":"github-dark"}}
const result = await sdk.userLedger?.prepareSignExecuteAndWaitFor(
    transferCommand,
    keyPairSender.privateKey,
    v4(),
    disclosedContracts
)

const transferCid = (
    await sdk.userLedger!.getCreatedContractByUpdateId(
        result!.updateId,
        {
            interfaceIds: [TRANSFER_INSTRUCTION_INTERFACE_ID],
        }
    )
).contractId!
```

* unified `createTransferInstruction` choice helper

*the logic for Accept, Reject and Withdraw on a transfer instruction has been consolidated into a single `createTransferInstruction`
method, reducing boilerplate when you want to exercise a choice without caring about which specific one.*

```javascript theme={"theme":{"light":"github-light","dark":"github-dark"}}
const [command, disclosedContracts] =
    await sdk.tokenStandard!.createTransferInstruction(
        transferCid,
        'Accept' // or 'Reject' or 'Withdraw'
    )

await sdk.userLedger?.prepareSignExecuteAndWaitFor(
    command,
    keyPairSender.privateKey,
    v4(),
    disclosedContracts
)
```

* browser support for the ledger client

*the `@canton-network/core-ledger-client` package can now be imported and used directly in a browser environment. Node.js-specific
modules have been removed from the main bundle so that browser-based dApps and portfolio UIs can leverage the ledger utilities without
additional bundler workarounds.*

* fixed decimal precision handling

*decimal arithmetic is now handled using `decimal.js` to prevent floating-point precision errors when working with large or fractional
CC amounts.*