Secure Proof-of-Capacity Consensus on Substrate

May 2021, Grant received and first milestone delivered: Subspace Labs has received an open grant from the Web3 Foundation (W3F) to implement Proof-of-Capacity (PoC) consensus using the Substrate Framework. Subspace also delivered and approved first milestone, which showcases the ability to run a local development blockchain with a Substrate Client and a PoC Farmer. This is the first critical step on the long road ahead towards our goal of deploying the Subspace Network as a parachain on the Polkadot Network.
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June 2021, Second milestone delivered: In the previous milestone, we demonstrated the ability to run multiple farmers with different-sized plots on a local test network. This version of the protocol was secure in the so-called happy path, i.e., assuming that all nodes follow the proscribed protocol. For our final milestone, we have concluded a rigorous security analysis of our protocol, identified several attack vectors, and implemented the necessary countermeasures within the code for each.
The result is a Nakamoto-style (longest-chain) consensus protocol that is secure against all known attacks, suggesting that it would be impossible for one to derive an advantage from an alternate implementation.‍
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August 2021, third and final milestone delivered: In the previous milestone, we demonstrated the ability to run multiple farmers with different-sized plots on a local test network. This version of the protocol was secure in the so-called happy path, i.e., assuming that all nodes follow the proscribed protocol. For our final milestone, we have concluded a rigorous security analysis of our protocol, identified several attack vectors, and implemented the necessary countermeasures within the code for each. The result is a Nakamoto-style (longest-chain) consensus protocol that is secure against all known attacks, suggesting that it would be impossible for one to derive an advantage from an alternate implementation.
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