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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 ERC-721 Tokens - Sample
+size_categories:
+- 10M<n<100M
+---
+
+![BlockDB Banner](./assets/banner.jpg)
+
+## Sample Notice
+
+This dataset contains **a small sample** of the full BlockDB ERC-721 Tokens 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
+Catalog of ERC-721 (NFT) token contracts discovered on-chain. Each row represents a unique ERC-721 token collection with its metadata (name, symbol, base token URI) and provenance information indicating where the token was first recognized or derived from on-chain activity.
+
+Every token 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:
+
+	•	contract_address BYTEA – 20-byte address of the ERC-721 token contract (primary key)
+	•	block_number BIGINT – Block of the log attributed as the genesis/recognition point
+	•	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 block
+	•	name TEXT – Name of the ERC-721 token collection
+	•	symbol TEXT – Symbol/ticker of the ERC-721 token
+	•	base_token_uri TEXT – Base URI for token metadata, if any
+	•	_tracing_id BYTEA – Tracing ID of this ERC-721 token record
+	•	_genesis_tracing_ids BYTEA[] – Tracing IDs of the genesis records leading to this token record
+	•	_parent_tracing_ids BYTEA[] – Tracing IDs of the parent records leading to this token record
+	•	_created_at TIMESTAMPTZ – Record creation timestamp
+	•	_updated_at TIMESTAMPTZ – Record last update timestamp
+
+
+### Notes
+	•	Primary key: contract_address guarantees uniqueness per token collection.
+	•	Indexes on (block_number, tx_index, log_index), block_number, and block_time support fast lookups.
+	•	Binary values can be rendered as hex via encode(column, 'hex') in SQL for display or downstream joins.
+
+
+## Lineage
+Each token record includes deterministic _tracing_id, _genesis_tracing_ids, and _parent_tracing_ids, providing:
+
+	•	Provenance tracking from raw logs to decoded token metadata
+	•	Reproducible analytics and signal extraction
+	•	Cross-system consistency checks (RPC vs. indexers vs. internal warehouses)
+
+
+## Common Use Cases
+	•	Building NFT collection registries and metadata catalogs
+	•	NFT market analytics and collection tracking
+	•	NFT discovery and new collection detection
+	•	Wallet portfolio tracking for NFT holdings
+
+
+## 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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