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Thats not correct, data can be pruned because Miners dont want to be data storage and network hosts.
**OP\_RETURN / Data Outputs** — BSV uses `OP_RETURN` outputs extensively for storing arbitrary data (text, files, etc.). These are provably unspendable outputs, meaning they never enter the UTXO set. Miners and nodes can prune these from their local storage without affecting chain validity at all, as long as the Merkle proof is preserved. This is arguably the "safest" data to prune.
Using `OP_RETURN` to store the data means it's **permanently timestamped and provable** via Merkle proof, but the raw data payload can be dropped by nodes that don't want to store it long-term. Specialist archival nodes (like **WhatsOnChain** or services built on **TAAL's** infrastructure) can choose to retain it.
This creates a tiered storage model:
* The *proof that data existed* lives forever in the header chain
* The *actual data* can be held by archival services who may charge for retrieval
* You can always re-broadcast the data with its Merkle proof to prove authenticity
# Summary Table
|Data Type|Must Be Kept?|Can Be Pruned?|
|:-|:-|:-|
|Block headers|Yes, always|No|
|UTXO set|Yes, by miners|No|
|Spent TXO data|No|Yes|
|OP\_RETURN payloads|No|Yes (archival optional)|
|Merkle paths/proofs|Yes for SPV|NoUsing OP\_RETURN to store the data means it's permanently timestamped and provable via Merkle proof, but the raw data payload can be dropped by nodes that don't want to store it long-term. Specialist archival nodes (like WhatsOnChain or services built on TAAL's infrastructure) can choose to retain it.This creates a tiered storage model:The proof that data existed lives forever in the header chainThe actual data can be held by archival services who may charge for retrievalYou can always re-broadcast the data with its Merkle proof to prove authenticitySummary TableData Type Must Be Kept? Can Be Pruned?Block headers Yes, always NoUTXO set Yes, by miners NoSpent TXO data No YesOP\_RETURN payloads No Yes (archival optional)Merkle paths/proofs Yes for SPV No|

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