# Historical blocks

You need to source RocksDB ledger copies from those epochs to gather the raw data for historical blocks.  These are available from the following sources:

* Solana Foundation (public, Google Storage)
  * gs\://mainnet-beta-ledger-us-ny5
  * gs\://mainnet-beta-ledger-europe-fr2
  * gs\://mainnet-beta-ledger-asia-sg1
* Triton One (private)
  * For access, contact Triton One.

Once you have downloaded the RocksDB ledger archives, you can run the Radiance tool to generate a car file for an epoch. Ensure you have all the slots available in the RocksDB ledger archive for the epoch. You may need to download multiple ledger snapshots to have a full set of slots available. Once you know you have a RocksDB dataset that covers all the slots for the epoch, run the radiance tool like follows:

```
radiance car create2 107 --db=46223992/rocksdb --out=/storage/car/epoch-107.car
```

This will produce a car file called epoch-107.car containing all the blocks and transactions for that epoch. To specify multiple ledger snapshots, you can provide the db command line parameter multiple times `--db=12312/rocksdb --db=52321/rocksdb`.  The radiance tooling will automatically stitch the RocksDB ledger archives together to form a full epoch car file. 

## Check mode

You can check if your current ledger has the slots you require to generate the epoch-107.car by adding the following flag:

```
--check
```

This will ensure that the radiance car create2 command will walk through and check that it has all the slots.

## Shred revisions (epoch <=  32)

The shred format changed around epoch 32.

Add the following flag for epochs up to 32&#x20;

```
--shred-revision=1
```

When generating epoch 32 itself, you need to provide the following flags:

```
--shred-revision=1 --next-shred-revision-activation-slot=10367766

```

Note: Depending on what snapshots you use to generate this CAR file, this shred revision transition may occur on epoch 22.

## Epoch 208

While generating the OF1 archive, Triton One could not find a ledger file covering approximately 495 slots during Epoch 208. Since the ledger data was missing, Triton worked with Anza Labs to recreate a ledger for these 495 slots to build an Old Faithful CAR file for this epoch.&#x20;

The gap exists between slots 89856108 and 89856602 (inclusive).

For generating Epoch 208, you should, therefore, add this ledger copy as a CLI argument to radiance:

<pre><code><strong>--db epoch-208-rocksdb/
</strong></code></pre>

For more information about generating your own version of this ledger and validating that it is correct, see the [Epoch 208](#epoch-208) page under Validation.


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