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Update dataset card for blocks

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+ ---
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+ pretty_name: Blocks-Ethereum-Cryptocurrency-Data
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+ tags:
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+ - ethereum
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+ - blockchain
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+ - parquet
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+ - blockdb
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+ ---
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+
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+ # Blocks-Ethereum-Cryptocurrency-Data
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+
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+ Hive-partitioned Parquet export of BlockDB `blocks` (Ethereum).
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+
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+ ## Load
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+
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+ ```python
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+ from datasets import load_dataset
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+ ds = load_dataset("RBudzynski/Blocks-Ethereum-Cryptocurrency-Data", split="train")
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+ ```
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+
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+ Files live under `data/year=YYYY/month=MM/part-NNNN.parquet`.
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+
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+ Range: `2015-08` .. `2026-06` (UTC calendar months).
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+
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+ ## Schema
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+
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+ | column | type |
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+ | --- | --- |
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+ | `block_timestamp` | `timestamp` |
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+ | `block_number` | `int64` |
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+ | `block_hash` | `string` |
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+ | `parent_block_hash` | `string` |
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+ | `receipt_root` | `string` |
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+ | `miner` | `string` |
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+ | `gas_limit` | `int64` |
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+ | `extra_data` | `string` |
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+ | `size` | `int64` |
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+ | `_tracing_id` | `string` |
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+ | `_computed_receipt_root` | `string?` |
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+ | `_computed_receipt_timestamp_utc` | `timestamp?` |
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+ | `_created_at` | `timestamp` |
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+ | `_updated_at` | `timestamp` |
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+