In Solana news Today, the new Transaction V1 format went live on mainnet at approximately 01:00 UTC on September 15, 2026, raising the maximum size of a single transaction from 1,232 bytes to 4,096 bytes, according to the Solana Foundation.
That is roughly 3.3 times more room for instructions, signatures, and account data packed into one transaction. This changes how much data a transaction can carry, not how many transactions Solana processes per second, and most users should see ordinary SOL transfers look and feel the same.
Solana Transaction V1: What’s Changing?
.@solana is scheduled to activate Transaction V1 on mainnet around Sep 15, increasing the maximum serialized transaction size from 1,232 bytes → 4,096 bytes.
Before:
• Smaller transactions often forced complex actions to be split across… pic.twitter.com/UHTH2zChtR— Solana Daily (@solana_daily) September 15, 2026
The upgrade matters because Solana has spent years being faster and cheaper than Ethereum while working under a hard byte ceiling that rival networks did not share.
Related coverage of Solana’s price action around the rollout shows how the market has been digesting the network’s ongoing scaling push. At the time of writing, SOL USD is trading just above $100, down -1% over the past 24 hours.
Key Takeaways of the New Network Upgrade
- Bigger transactions: V1 transactions can now carry more instructions, signatures, and account information than the old 1,232-byte format allowed.
- New use cases: The design proposal behind the change flags zero-knowledge proofs, larger multisignature or company-wallet approvals, and batched DeFi operations as direct beneficiaries.
- Atomic guarantees: More steps can now fit into one all-or-nothing transaction, avoiding the workaround of bundling several transactions that don’t share the same rollback protection.
- Compatibility, not outage: Wallets, indexers, and block explorers need to recognize V1 data, or requests can fail; older legacy and v0 formats keep working exactly as before.
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Solana News: How Transaction V1 Changes Transactions On-Chain
(SOURCE: Defi Llama)
The mechanics are straightforward. Solana’s old single-transaction limit was 1,232 bytes; the new Transaction V1 format raises that ceiling to 4,096 bytes, giving developers extra space for instructions, signatures, and other data needed to execute an operation.
Under the old cap, developers routinely had to squeeze complex logic into one cramped package or split it across several separate transactions.
That splitting came at a cost. Bundled transactions don’t carry the same network-level guarantee that every step succeeds or fails together, so a multi-step trade or approval could partially execute and leave a mess to clean up.
A single larger V1 transaction preserves the all-or-nothing property: if one instruction fails, the whole thing rolls back. The upgrade’s design proposal specifically calls out zero-knowledge proofs and large multisignature approvals as workloads that benefit most.
By contrast, Ethereum avoids a rigid per-transaction byte cap altogether and instead lets users pay higher gas fees to run data-dense operations under a flexible block gas limit, a structural difference that Solana’s new format is designed to narrow.
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Infrastructure Compatibility Risks With V1 Network Upgrade
BREAKING: @Solana’s Transaction V1 is live on mainnet, increasing the maximum transaction size 3.3x to 4,096 bytes.
ZK proofs, large multisigs, and confidential transfers can now be completed in one transaction. pic.twitter.com/wnPIGcM1zm
— SolanaFloor (@SolanaFloor) September 15, 2026
In other Solana news, the near-term burden falls on the software that reads Solana data, not on people sending routine transfers. Applications that read or index transactions and blocks need to recognize the new V1 format.
If they don’t, a request for an individual V1 transaction can fail, and a request for an entire block can fail if that block contains even one V1 transaction, the Solana Foundation warns.
That list includes wallets, trading apps, block explorers and analytics platforms – any service that feeds blockchain data downstream. Crucially, these are compatibility warnings tied to specific unsupported requests, not evidence of a broad network outage.
Older legacy and v0 transaction formats remain fully supported, so an app that never touches V1 data continues functioning without changes.
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