v0.2.x to v0.3.0 - Arcium Docs

1. Update Rust toolchain

Arcium v0.3.0 requires Rust 1.88.0. Create or update your rust-toolchain file:

# Create or overwrite the rust-toolchain file
echo "1.88.0" | tee rust-toolchain > /dev/null

2. Add required Cargo patch

Add the following patch to your workspace Cargo.toml:

[patch.crates-io]
proc-macro2 = { git = 'https://github.com/arcium-hq/proc-macro2.git' }

This patch is required for proper compilation of Arcium v0.3.0 projects. The patched proc-macro2 crate contains fixes necessary for the Arcium macros to work correctly with Rust 1.88.0 and the new v0.3.0 architecture.

3. Update Arcium Rust dependencies

# Update program dependencies
cd programs/your-program-name
cargo update --package arcium-client --precise 0.3.0
cargo update --package arcium-macros --precise 0.3.0
cargo update --package arcium-anchor --precise 0.3.0

# Update encrypted-ixs dependencies
cd ../../encrypted-ixs
cargo update --package arcis-imports --precise 0.3.0

4. Update Arcium TS dependencies

npm install @arcium-hq/[email protected]

5. Enable init-if-needed feature in Cargo.toml

Add the init-if-needed feature to your anchor-lang dependency in your program’s Cargo.toml:

[dependencies]
anchor-lang = { version = "0.31.1", features = ["init-if-needed"] }

This feature is required for the Sign PDA account management in v0.3.0.

6. Add Sign PDA Account to your queue computation accounts

You need to add a new required account (sign_pda_account) to all your queue_computation_accounts context structs:

#[queue_computation_accounts]
#[derive(Accounts)]
pub struct YourComputationContext<'info> {
    #[account(mut)]
    pub payer: Signer<'info>,

    // Add this new required account
    #[account(
        init_if_needed,
        space = 9,
        payer = payer,
        seeds = [&SIGN_PDA_SEED],
        bump,
        address = derive_sign_pda!(),
    )]
    pub sign_pda_account: Account<'info, SignerAccount>,

    // ... your other existing accounts
}

And in your instruction function, add this line to set the bump:

pub fn your_computation_function(
    ctx: Context<YourComputationContext>,
    computation_offset: u64,
    // ... other parameters
) -> Result<()> {
    // Add this line
    ctx.accounts.sign_pda_account.bump = ctx.bumps.sign_pda_account;

    // ... rest of your function
}

7. Update queue_computation call signature

The queue_computation function now requires explicit callback instruction specification. Update your calls from:

// Before v0.3.0
queue_computation(ctx.accounts, computation_offset, args, None, None)?;

to:

// v0.3.0
queue_computation(
    ctx.accounts,
    computation_offset,
    args,
    None,
    vec![YourCallback::callback_ix(&[])],
)?;

Replace YourCallback with the actual name of your callback struct. For detailed examples and best practices on implementing callback instructions with custom accounts, see Callback Accounts.

8. Remove payer from callback accounts

Callback account structs no longer require a payer parameter. Update your callback accounts from:

// Before v0.3.0
#[callback_accounts("your_computation", payer)]
#[derive(Accounts)]
pub struct YourCallback<'info> {
    #[account(mut)]
    pub payer: Signer<'info>,
    pub arcium_program: Program<'info, Arcium>,
    // ... other accounts
}

to:

// v0.3.0
#[callback_accounts("your_computation")]
#[derive(Accounts)]
pub struct YourCallback<'info> {
    // No payer required
    pub arcium_program: Program<'info, Arcium>,
    #[account(
        address = derive_comp_def_pda!(COMP_DEF_OFFSET)
    )]
    pub comp_def_account: Account<'info, ComputationDefinitionAccount>,
    #[account(address = ::anchor_lang::solana_program::sysvar::instructions::ID)]
    /// CHECK: instructions_sysvar, checked by the account constraint
    pub instructions_sysvar: AccountInfo<'info>,
}

9. Update x25519 function calls (TypeScript only)

If you’re using x25519 key generation in your TypeScript client code, update the function name:

// Before v0.3.0
const privateKey = x25519.utils.randomPrivateKey();

// v0.3.0
const privateKey = x25519.utils.randomSecretKey();

10. Verify Migration

After completing all migration steps, verify that everything works correctly:

Build Test

# From your workspace root
arcium build

Type Checking

# Ensure all new types compile correctly
cargo check --all

Test Your Changes

# Run your existing tests to ensure functionality is preserved
arcium test

Complete Example

Here’s a complete before/after example of a typical computation function:

Before v0.3.0:

#[queue_computation_accounts]
#[derive(Accounts)]
pub struct Flip<'info> {
    #[account(mut)]
    pub payer: Signer<'info>,
    // ... other accounts (no sign_pda_account)
}

pub fn flip(
    ctx: Context<Flip>,
    computation_offset: u64,
    user_choice: [u8; 32],
    pub_key: [u8; 32],
    nonce: u128,
) -> Result<()> {
    let args = vec![
        Argument::ArcisPubkey(pub_key),
        Argument::PlaintextU128(nonce),
        Argument::EncryptedU8(user_choice),
    ];

    queue_computation(ctx.accounts, computation_offset, args, None, None)?;
    Ok(())
}

v0.3.0:

#[queue_computation_accounts]
#[derive(Accounts)]
pub struct Flip<'info> {
    #[account(mut)]
    pub payer: Signer<'info>,

    #[account(
        init_if_needed,
        space = 9,
        payer = payer,
        seeds = [&SIGN_PDA_SEED],
        bump,
        address = derive_sign_pda!(),
    )]
    pub sign_pda_account: Account<'info, SignerAccount>,

    // ... other existing accounts
}

pub fn flip(
    ctx: Context<Flip>,
    computation_offset: u64,
    user_choice: [u8; 32],
    pub_key: [u8; 32],
    nonce: u128,
) -> Result<()> {
    let args = vec![
        Argument::ArcisPubkey(pub_key),
        Argument::PlaintextU128(nonce),
        Argument::EncryptedU8(user_choice),
    ];

    ctx.accounts.sign_pda_account.bump = ctx.bumps.sign_pda_account;

    queue_computation(
        ctx.accounts,
        computation_offset,
        args,
        None,
        vec![FlipCallback::callback_ix(&[])],
    )?;

    Ok(())
}

That’s it! Your program should now be compatible with Arcium tooling v0.3.0.

​1. Update Rust toolchain

​2. Add required Cargo patch

​3. Update Arcium Rust dependencies

​4. Update Arcium TS dependencies

​5. Enable init-if-needed feature in Cargo.toml

​6. Add Sign PDA Account to your queue computation accounts

​7. Update queue_computation call signature

​8. Remove payer from callback accounts

​9. Update x25519 function calls (TypeScript only)

​10. Verify Migration

​Build Test

​Type Checking

​Test Your Changes

​Complete Example

​Before v0.3.0:

​v0.3.0: