Editing Portal:Crypto and Blockchain (section)

=== Block explorers, search, and indexing ===

Cryptocurrency users often need to search blockchain data by address, transaction ID, block height, token, contract, event, or timestamp. Block explorers solve this by indexing chain data into databases and search systems.

Perl can participate in this layer by reading from a node, decoding data, storing structured records, and exposing search or reporting interfaces. It can also connect blockchain data to search engines such as Elasticsearch, to SQL databases such as PostgreSQL and MariaDB, or to local SQLite indexes.

A Perl-based indexer is especially plausible for custom internal use: watching a fixed set of addresses, auditing a wallet, tracking payments, reconciling exchange deposits, or building a specialized report. It is less likely to be the first choice for a high-volume public explorer, but it can be effective for targeted use.