# 0age: Seaport, and protocol development with OpenSea

By [Sina Habibian](https://paragraph.com/@sinahab) · 2022-06-02

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Here is my conversation with [0age](https://twitter.com/z0age): [intothebytecode.xyz/0age-seaport/](https://www.intothebytecode.xyz/0age-seaport/)

0age is the Head of Protocol Development at [OpenSea](https://twitter.com/opensea), and this was a conversation about [Seaport](https://github.com/ProjectOpenSea/seaport), the new marketplace protocol for buying and selling NFTs.

0age takes us through a tour of the Seaport protocol, talking about how it's architected; how conduits and zones work; and we even get into the low level gas optimization work they've done on the contracts. I hope this can be a helpful resource for anyone looking to understand the Seaport protocol or anyone who's building with NFTs more broadly. I also consider 0age to be a true veteran of the space, and hearing him talk through the design of the protocol can be an educational experience in its own rights. I definitely personally found that to be the case.

I hope you enjoy!

Timestamps:

**1:42** why build Seaport **10:20** the Seaport architecture **12:44** EIP712 signatures **14:17** the global concept of a nonce **16:02** EIP1271 and bulk listings **17:18** the Executor and conduits **25:08** zones, additional rules that can be applied on top of an order **29:47** implementing English auctions via zones **32:17** layers of the stack **36:05** fulfillment **40:42** gas optimizations and understanding the low-level behavior of the EVM **58:40** the interaction between OpenSea the product and Seaport the protocol **01:07:06** criteria based items, and partial fills **01:17:50** ideas to build on top of Seaport

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*Originally published on [Sina Habibian](https://paragraph.com/@sinahab/0age-seaport-and-protocol-development-with-opensea)*