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Quantitative Finance · Glossário

O que é Event log, indexer?

Também chamado de: event log · indexer

Definition 26.2 Markets III: Commodities, Energy and Crypto · Capítulo 26 — Crypto Data and Infrastructure

An event log is a record a smart contract emits during a transaction (a swap, a transfer, a liquidation), stored in the transaction’s receipt with indexed fields that can be searched. An indexer is a system that reads every block from a node, decodes the logs and state changes of the contracts it cares about, and stores them in a database that can be queried by time, address or event type.

A crypto firm’s two data pipelines: blocks from its own nodes through an indexer, and venues’ feeds through a book builder that checks sequence and checksums, both into one normalised store that keeps the source’s timestamp and the time of receipt. Schematic.
Figure 26.1. A crypto firm’s two data pipelines: blocks from its own nodes through an indexer, and venues’ feeds through a book builder that checks sequence and checksums, both into one normalised store that keeps the source’s timestamp and the time of receipt. Schematic.
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