Update README.md

README.md

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----
-license: cc-by-nc-4.0
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+---
+license: cc-by-nc-4.0
+tags:
+- ethereum
+- evm
+- blockchain
+- cryptocurrency
+- crypto
+- onchain-data
+pretty_name: BlockDB Raw Blocks - Sample
+size_categories:
+- 1K<n<10K
+---
+
+## Sample Notice
+
+This dataset contains **a small sample** of the full BlockDB Raw Blocks dataset.  
+It is provided **for evaluation, research, and interoperability testing only**.
+
+If you need full historical coverage, real-time streaming, or end-of-day (EOD) exports
+please contact us directly:
+
+📧 **support@blockdb.io**  
+🌐 https://www.blockdb.io  
+
+
+## Dataset Overview
+Each block entry contains the complete structural and integrity metadata required to reconstruct or verify the block state:
+hashes, parent linkage, miner address, gas and size metrics, timestamps, extra data, and lineage identifiers (_tracing_id, _computed_receipt_root).
+
+
+## Chains and Coverage
+ETH, BSC, Base, Arbitrum, Unichain, Avalanche, Polygon, Celo, Linea, Optimism (others on request).
+Full history from chain genesis; reorg-aware real-time ingestion and updates.
+
+
+## Schema
+List of columns exactly as delivered:
+  •	block_number BIGINT - Sequential block number
+  •	block_hash BYTEA - 32-byte block hash
+  •	parent_hash BYTEA - 32-byte parent block hash
+  •	receipts_root BYTEA - Root hash of all receipts in the block
+  •	miner BYTEA - 20-byte miner (beneficiary) address
+  •	gas_limit NUMERIC(78,0) - Maximum gas allowed for the block
+  •	extra_data BYTEA - Arbitrary ≤32-byte payload embedded by the block producer
+  •	size BIGINT - Total block size in bytes (header + transactions + receipts)
+  •	timestamp_utc TIMESTAMPTZ - UTC timestamp when the block was mined
+  •	_tracing_id BYTEA - Deterministic tracing ID of this block record
+  •	_computed_receipt_root BYTEA - Recomputed receipts root (BlockDB integrity check)
+  •	_computed_receipt_timestamp_utc TIMESTAMPTZ - Timestamp when the receipts root was computed or revalidated
+  •	_created_at TIMESTAMPTZ - Record creation timestamp
+  •	_updated_at TIMESTAMPTZ - Record last update timestamp
+
+
+### Notes
+  •	Use encode(block_hash, 'hex') to convert binary values to hex for presentation or joins.
+  •	Every block record is verified against the node RPC.
+
+
+## Lineage
+Each block record includes a deterministic _tracing_id, forming the root lineage reference for all derived BlockDB datasets (swaps, liquidity, and token prices).
+This ensures verifiable traceability, reproducibility, and proof-of-derivation for every downstream record.
+
+
+## Common Use Cases
+  •	Benchmarking node or indexer consistency across chains
+  •	Establishing canonical ground truth for analytics or compliance systems
+  •	Foundation layer for derived token, swap, and liquidity datasets
+  •	Validating receipts and state integrity with recomputed roots
+
+
+## Quality
+  •	Verifiable lineage: deterministic cryptographic hashes per row
+  •	Reorg-aware ingestion: continuity and consistency across forks
+  •	Complete historical coverage: from chain genesis to present