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In our fifth episode, Nicole Zhu and Joe Petrowski talk to Emiel Sebastiaan, WEB3SCAN CEO, about Polkascan, an open-source block explorer that allows any Substrate-based blockchain project to have a block explorer. They discuss the Polkadot multi-chain explorer, how a DAO could fund block explorer services, Polkascan vs. Polkadot UI, and the nitty-gritty of how one actually goes about extracting data from a blockchain. Links: https://www.web3scan.com https://polkascan.io https://medium.com/polkascan https://github.com/polkascan https://twitter.com/polkascan Highlights: 01:32 - How Emiel got into block explorers 04:38 - Block explorer use cases 06:26 - Getting meaningful data out of Substrate vs. Bitcoin and Ethereum 08:54 - Specialized and upgradable runtimes with Substrate 13:01 - Out-of-the-box block explorer support for parachains 16:00 - Polkascan PRE and Polkascan MC 19:38 - How Polkascan uses archive nodes 21:51 - Tools Polkascan uses 26:40 - Performance benchmarks for block explorers 31:40 - Scalability, roadmap, and managing 10-terabyte databases 37:58 - The roadmap to paid services 45:34 - DAOs as customers 52:18 - Polkascan vs. Polkadot UI 57:34 - A multi-chain universe Special Guest: Emiel Sebastiaan.