What is a Shred
A shred is Solana's smallest block data unit: a block piece designed to fit within one network packet, or approximately 1,200 bytes. The leader does not send a completed block to anyone when generating it in its 400-millisecond slot. Instead, the leader sends shreds out as transactions get executed; the network begins receiving block data before the block even fully exists.
Imagine mailing a book one postcard at a time, starting to mail the pages the moment you write them, rather than finishing the book then mailing it whole. People can read and start reading the story right away, and when you finish writing the book most of the network has read the majority of the book.
How Shreds Work Technically
There are two kinds of shreds. Data shreds contain the transaction data. Coding shreds contain recovery data created by using Reed-Solomon erasure coding to allow the receiving party to recover the missing data. Shreds are sent over the UDP network protocol, which is very fast and not reliable; we therefore expect to lose packets. With erasure coding in the coding shreds, validators can lose a very high percentage of the packets and recover everything anyway within the batch.
Every shred is digitally signed by the leader, contains a slot and shred index, and is sent out through Turbine, Solana's stake-weighted gossip protocol. Validators receive the shreds, assemble them into a block, replay the block to verify transactions, then vote for the block. With the Alpenglow upgrade, shreds will instead be sent through Rotor (currently in community testnet; mainnet expected late 2026), which is a flat network with one hop, but the concept of the shred itself is unchanged.
Why Shreds Are Valuable Beyond Consensus
Shreds have become their own product in themselves, because if you can see a transaction before anyone else then you can trade it and make money. The leader of the slot and other validators see transaction information in the form of shreds hundreds of milliseconds before the block gets finalized. For trading purposes, this delay is huge.
There's even a whole ecosystem around getting and reading the latest shreds as fast as possible. ShredStream by Jito lets you get shred information with low latency. DoubleZero Edge also does this and runs on DoubleZero's proprietary fiber network, and as of Q2 2026 had 434 validators on their network pushing out shreds for people to pay (in USDC) to have access to the data. When a token launches on Raydium and bots race to buy the token immediately, these are almost certainly bots that have been watching shreds for this, not waiting for a block to get finalized.
A caveat to watch out for: the data in shreds is by definition unconfirmed. It's not that you can't see it, but it's information that the leader is sending out while it's building its next block; if there's a fork or skipped slot, this information can get thrown away. So it's possible that acting on this information will require you to accept the risk that the block may or may not get confirmed.
Why Shreds Matter
Bitcoin and Ethereum send out complete blocks after the block is completed. The Ethereum block is created and finalized, then the block is sent across the network within the slot (which is 12 seconds long). While not the worst time, this still means blocks can be received as one unit after they're finalized. The reason Solana can have a 400-millisecond block time is because the blocks are streamed out across the network while the block is still being produced, so there's time for the blocks to be sent across the network.
In the end, this all adds up to the Phantom wallet's ability to show you a transaction is confirmed within a second or so and with very low base fees (around $0.00025).
Shreds make Solana's speed more than just numbers. The ability to stream blocks in small packets and ensure reliability with erasure coding means we can support 1,000+ validators at 400-millisecond slot times. Shreds give users their fast transactions. Shreds allow developers and traders to watch the market in real time in a way that's unmatched in the crypto space. Shreds are Solana showing how to re-architect and rebuild the plumbing of a blockchain, rather than being restricted by the limitations on speed that gossiping out blocks as whole units creates in most other blockchains.
