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In this section of the walkthrough, we learn how to stake QSP so that operators can be eligible to scan smart contracts.
Relevant links:
https://github.com/quantstamp/qsp-protocol-node/blob/develop/doc/node-operator.md#making-your-account-eligible-as-a-node-operator
https://etherscan.io/token/0x99ea4db9ee77acd40b119bd1dc4e33e1c070b80d
https://s3.amazonaws.com/qsp-protocol-contract/mainnet/QuantstampAudit-v-2-meta.json