TowerBFT + PoH

Q: What Solana CLI version should I use?

Use Solana CLI 3.0.10, which pairs with Agave 4.1.1. Install with agave-install init 4.1.1 (or your team's pin file), then verify with solana --version and agave-install --version.

Q: Should I use @solana/kit or web3.js?

Use @solana/kit 7.0.0 for new TypeScript—typed RPC methods, smaller API surface, and examples on this page already use Kit. Keep web3.js only for legacy codebases; migrate RPC calls and transaction building incrementally.

Q: What commitment level is recommended?

Use confirmed for UX that tolerates rare forks; use finalized before irreversible payouts or bridge messages. Re-benchmark timeouts during Alpenglow rollout.

Q: How do I debug related failures?

Reorgs are rare but possible before finalized. If a tx disappears, it was likely on a dropped fork—wait for finalized for irreversible actions.

Q: Does this work on devnet?

Yes—point CLI and RPC to https://api.devnet.solana.com. Behavior matches mainnet; only account data and economics differ.

The vote-based BFT consensus in the Agave era. This guide targets Agave 4.1.1 validators, Solana CLI 3.0.10, Anchor 0.32.1, and @solana/kit 7.0.0 clients.

Recipe

Quick-reference recipe card.

solana config set --url devnet
solana balance

import { createSolanaRpc } from "@solana/kit";
const rpc = createSolanaRpc("https://api.devnet.solana.com");

When to reach for this:

Implementing or debugging towerbft + poh in production paths
Teaching the concept to engineers new to Solana
Auditing whether your stack matches Agave 4.1 era behavior

Working Example

import { createSolanaRpc, address } from "@solana/kit";
 
const rpc = createSolanaRpc("https://api.devnet.solana.com");
const slot = await rpc.getSlot().send();
 
const sig = "PASTE_SIGNATURE_AFTER_YOUR_TX";
const tx = await rpc
  .getTransaction(sig, { encoding: "json", maxSupportedTransactionVersion: 0 })
  .send();
 
console.log({ slot, err: tx?.meta?.err, cu: tx?.meta?.computeUnitsConsumed });

use anchor_lang::prelude::*;
#[program]
pub mod demo {
    use super::*;
    pub fn log_slot(_ctx: Context<LogSlot>) -> Result<()> {
        let clock = Clock::get()?;
        msg!("slot: {}", clock.slot);
        Ok(())
    }
}
#[derive(Accounts)]
pub struct LogSlot {}

What this demonstrates:

RPC access patterns with @solana/kit 7.0.0
Reading execution metadata (errors, CU) from confirmed transactions
On-chain sysvar access in Anchor 0.32.1 programs

Deep Dive

How It Works

The vote-based BFT consensus in the Agave era.
Solana's account model requires explicit account lists per instruction
Sealevel executes non-conflicting transactions in parallel

Agave 4.1.1 Notes

Confirmation semantics follow TowerBFT voting with PoH ordering
Alpenglow (Votor + Rotor) is rolling out for faster finality - see Consensus section
Local development: Surfpool 0.12.0 and LiteSVM 0.6.x

Rust Notes

// Use checked math and explicit constraints in programs
require!(amount > 0, MyError::InvalidAmount);

Gotchas

Legacy web3.js v1 snippets - API differs from Kit. Fix: use @solana/kit 7.0.0.
Wrong cluster - devnet vs mainnet mismatch. Fix: align CLI, RPC, wallet, explorer.
Float SOL amounts - precision loss. Fix: bigint lamports end-to-end.
Expired blockhash - dropped txs. Fix: re-fetch blockhash and re-sign.
Insufficient CU - OOM or budget exceeded. Fix: optimize program + set Compute Budget.
Missing owner checks - writable account exploits. Fix: Anchor constraints on every mut account.

Alternatives

Alternative	Use When	Don't Use When
@solana/kit 7.0.0	New TypeScript clients	Maintaining legacy code temporarily
Solana CLI 3.0.10	Ops and quick probes	Production transaction signing at scale
Surfpool 0.12.0	Anchor integration tests	Production deployment
LiteSVM 0.6.x	Fast unit tests	Full network behavior validation

FAQs

How does this apply on Agave 4.1.1?

Agave 4.1.1 validators vote in lockstep with PoH ticks; confirmations deepen as votes accumulate on a fork.

What Solana CLI version should I use?

Use Solana CLI 3.0.10, which pairs with Agave 4.1.1. Install with agave-install init 4.1.1 (or your team's pin file), then verify with solana --version and agave-install --version.

Should I use @solana/kit or web3.js?

Use @solana/kit 7.0.0 for new TypeScript—typed RPC methods, smaller API surface, and examples on this page already use Kit. Keep web3.js only for legacy codebases; migrate RPC calls and transaction building incrementally.

What commitment level is recommended?

Use confirmed for UX that tolerates rare forks; use finalized before irreversible payouts or bridge messages. Re-benchmark timeouts during Alpenglow rollout.

How do I debug related failures?

Reorgs are rare but possible before finalized. If a tx disappears, it was likely on a dropped fork—wait for finalized for irreversible actions.

Does this work on devnet?

Yes—point CLI and RPC to https://api.devnet.solana.com. Behavior matches mainnet; only account data and economics differ.

How do compute units affect this?

TowerBFT is consensus-layer—no direct CU impact. Client impact is which commitment level you poll.

What is the Anchor 0.32.1 pattern?

Anchor 0.32.1 patterns apply when you write on-chain programs: typed accounts, require! guards, and IDL generation—use avm use 0.32.1 and anchor-lang = "0.32.1" in Cargo.toml.

How do I test with Surfpool 0.12.0?

Surfpool helps test client polling scripts against forked state; it does not simulate validator voting internals.

Can LiteSVM 0.6.x cover this?

LiteSVM does not run TowerBFT votes; transactions succeed or fail immediately in tests.

What changed in the Agave era?

The validator client rebranded to Agave (4.1.1), CLI 3.0.10 aligns with it, and Alpenglow work is changing finality—pin versions and read release notes each upgrade.

Where do I find related RPC methods?

Poll getSignatureStatuses at confirmed and finalized; use isBlockhashValid when retrying after forks.

Browse other pages in the consensus-alpenglow section for complementary topics
Solana Basics - account and transaction orientation

Stack versions: This page was written for Agave 4.1.1, Solana CLI 3.0.10, Anchor 0.32.1, anchor-lang 0.32.1, Rust 1.91.1, @solana/kit 7.0.0, Surfpool 0.12.0, and LiteSVM 0.6.x.

Recipe

Quick-reference recipe card.

solana config set --url devnet
solana balance

import { createSolanaRpc } from "@solana/kit";
const rpc = createSolanaRpc("https://api.devnet.solana.com");

When to reach for this:

Implementing or debugging towerbft + poh in production paths
Teaching the concept to engineers new to Solana
Auditing whether your stack matches Agave 4.1 era behavior

Working Example

import { createSolanaRpc, address } from "@solana/kit";
 
const rpc = createSolanaRpc("https://api.devnet.solana.com");
const slot = await rpc.getSlot().send();
 
const sig = "PASTE_SIGNATURE_AFTER_YOUR_TX";
const tx = await rpc
  .getTransaction(sig, { encoding: "json", maxSupportedTransactionVersion: 0 })
  .send();
 
console.log({ slot, err: tx?.meta?.err, cu: tx?.meta?.computeUnitsConsumed });

use anchor_lang::prelude::*;
#[program]
pub mod demo {
    use super::*;
    pub fn log_slot(_ctx: Context<LogSlot>) -> Result<()> {
        let clock = Clock::get()?;
        msg!("slot: {}", clock.slot);
        Ok(())
    }
}
#[derive(Accounts)]
pub struct LogSlot {}

What this demonstrates:

RPC access patterns with @solana/kit 7.0.0
Reading execution metadata (errors, CU) from confirmed transactions
On-chain sysvar access in Anchor 0.32.1 programs

Deep Dive

How It Works

The vote-based BFT consensus in the Agave era.
Solana's account model requires explicit account lists per instruction
Sealevel executes non-conflicting transactions in parallel

Agave 4.1.1 Notes

Confirmation semantics follow TowerBFT voting with PoH ordering
Alpenglow (Votor + Rotor) is rolling out for faster finality - see Consensus section
Local development: Surfpool 0.12.0 and LiteSVM 0.6.x

Rust Notes

// Use checked math and explicit constraints in programs
require!(amount > 0, MyError::InvalidAmount);

Gotchas

Legacy web3.js v1 snippets - API differs from Kit. Fix: use @solana/kit 7.0.0.
Wrong cluster - devnet vs mainnet mismatch. Fix: align CLI, RPC, wallet, explorer.
Float SOL amounts - precision loss. Fix: bigint lamports end-to-end.
Expired blockhash - dropped txs. Fix: re-fetch blockhash and re-sign.
Insufficient CU - OOM or budget exceeded. Fix: optimize program + set Compute Budget.
Missing owner checks - writable account exploits. Fix: Anchor constraints on every mut account.

Alternatives

Alternative	Use When	Don't Use When
@solana/kit 7.0.0	New TypeScript clients	Maintaining legacy code temporarily
Solana CLI 3.0.10	Ops and quick probes	Production transaction signing at scale
Surfpool 0.12.0	Anchor integration tests	Production deployment
LiteSVM 0.6.x	Fast unit tests	Full network behavior validation

FAQs

How does this apply on Agave 4.1.1?

Agave 4.1.1 validators vote in lockstep with PoH ticks; confirmations deepen as votes accumulate on a fork.

What Solana CLI version should I use?

Use Solana CLI 3.0.10, which pairs with Agave 4.1.1. Install with agave-install init 4.1.1 (or your team's pin file), then verify with solana --version and agave-install --version.

Should I use @solana/kit or web3.js?

What commitment level is recommended?

Use confirmed for UX that tolerates rare forks; use finalized before irreversible payouts or bridge messages. Re-benchmark timeouts during Alpenglow rollout.

How do I debug related failures?

Reorgs are rare but possible before finalized. If a tx disappears, it was likely on a dropped fork—wait for finalized for irreversible actions.

Does this work on devnet?

Yes—point CLI and RPC to https://api.devnet.solana.com. Behavior matches mainnet; only account data and economics differ.

How do compute units affect this?

TowerBFT is consensus-layer—no direct CU impact. Client impact is which commitment level you poll.

What is the Anchor 0.32.1 pattern?

Anchor 0.32.1 patterns apply when you write on-chain programs: typed accounts, require! guards, and IDL generation—use avm use 0.32.1 and anchor-lang = "0.32.1" in Cargo.toml.

How do I test with Surfpool 0.12.0?

Surfpool helps test client polling scripts against forked state; it does not simulate validator voting internals.

Can LiteSVM 0.6.x cover this?

LiteSVM does not run TowerBFT votes; transactions succeed or fail immediately in tests.

What changed in the Agave era?

The validator client rebranded to Agave (4.1.1), CLI 3.0.10 aligns with it, and Alpenglow work is changing finality—pin versions and read release notes each upgrade.

Where do I find related RPC methods?

Poll getSignatureStatuses at confirmed and finalized; use isBlockhashValid when retrying after forks.

Browse other pages in the consensus-alpenglow section for complementary topics
Solana Basics - account and transaction orientation

Stack versions: This page was written for Agave 4.1.1, Solana CLI 3.0.10, Anchor 0.32.1, anchor-lang 0.32.1, Rust 1.91.1, @solana/kit 7.0.0, Surfpool 0.12.0, and LiteSVM 0.6.x.

TowerBFT + PoH

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TowerBFT + PoH