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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
+- tabular
+- timeseries
+- datasets
+- pandas
+- polars
+- duckdb
+pretty_name: BlockDB Token Transfers - Sample
+size_categories:
+- 10M<n<100M
+---
+
+![BlockDB Banner](./assets/banner.jpg)
+
+## Sample Notice
+
+This dataset contains **a small sample** of the full BlockDB Token Transfers 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
+Unified token transfer table covering all transfer types in a single normalized schema. Each row represents one transfer event sourced from transactions, internal transactions, or transfer logs — covering native ETH, ERC-20, ERC-721, and ERC-1155 transfers. Only transfers for identified contract addresses are included.
+
+Every transfer record includes deterministic tracing IDs that link the record to its genesis event and upstream sources, enabling full provenance tracking for downstream analytics.
+
+
+## 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:
+
+	•	id BIGINT – Surrogate primary key (auto-generated)
+	•	block_number BIGINT – Block where the transfer occurred
+	•	block_time TIMESTAMPTZ – UTC timestamp when the block was mined
+	•	tx_index INTEGER – Transaction index within the block
+	•	log_index INTEGER – Log index within the transaction receipt; null for native or internal tx transfers
+	•	trace_address TEXT – Trace address for internal tx transfers (e.g., "0", "0.1"); null for other types
+	•	from_address BYTEA – Sender address (20 bytes)
+	•	to_address BYTEA – Recipient address (20 bytes)
+	•	token_address BYTEA – Token contract address (20 bytes); null for native ETH transfers
+	•	amount_raw NUMERIC(78,0) – Raw amount in smallest unit (wei for native, raw uint256 for ERC-20/1155)
+	•	amount_adj TEXT – Decimal-adjusted amount; null if decimals unknown or NFT
+	•	token_id NUMERIC(78,0) – Token ID for ERC-721 and ERC-1155; null for native/ERC-20
+	•	transfer_type TEXT – Transfer type: native_tx, native_internal, erc20, erc721, erc1155
+	•	_tracing_id BYTEA – Tracing ID of this transfer record
+	•	_parent_tracing_ids BYTEA[] – Tracing IDs of the parent records leading to this transfer record
+	•	_created_at TIMESTAMPTZ – Record creation timestamp
+	•	_updated_at TIMESTAMPTZ – Record last update timestamp
+
+
+### Notes
+	•	transfer_type distinguishes native ETH from top-level transactions (native_tx) vs. internal calls (native_internal).
+	•	amount_adj is null for NFTs (ERC-721) and when token decimals cannot be determined.
+	•	FK: (block_number, tx_index) → blockdb_evm.b0102_transactions_v1.
+	•	Binary values can be rendered as hex via encode(column, 'hex') in SQL.
+
+
+## Lineage
+Each transfer record includes deterministic _tracing_id and _parent_tracing_ids, providing:
+
+	•	Provenance tracking from raw transactions, internal calls, and logs to normalized transfer events
+	•	Reproducible analytics and signal extraction
+	•	Cross-system consistency checks (RPC vs. indexers vs. internal warehouses)
+
+
+## Common Use Cases
+	•	Wallet balance and flow analytics across all token standards
+	•	Token movement and holder tracking
+	•	Compliance and attribution (native + ERC-20/721/1155 in one table)
+	•	MEV and arbitrage flow reconstruction
+	•	Portfolio tracking and tax reporting
+
+
+## Quality
+	•	Verifiable lineage: deterministic cryptographic hashes per row
+	•	Reorg-aware ingestion: continuity and consistency across forks
+	•	Complete historical coverage: from chain genesis to present

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