# Data Dictionary - Crypto On-Chain Analytics (multi-chain) - BTC + ETH daily network fundamentals, cleaned Parquet

**Units:** vary by `metric` - read the per-row `unit` column (overall: mixed).  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Chain (BTC or ETH) |
| `ts` | timestamp (UTC) | Day |
| `metric` | str | Active addresses / Transaction count / On-chain volume / Fees / Gas used / ETH burned / … |
| `value` | float | Metric value (count, bytes, gwei, or native coin) |
| `unit` | str | unit |
| `res_min` | int | Native resolution (daily = 1440) |

*Source: Public blockchain data (public domain) via Google BigQuery public datasets.*