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Dhariwal defines Proof of Identity (PoI) as:

Proof of Identity (PoI) is the concept of PoI is to compare the private key to an authorized identity. Proof of Identity (PoI) is basically cryptographic evidence (a piece of data) that tells that any user knows a private key that compares to an authorized identity and is cryptographically attached to a specific transaction. Every individual from an existing group can create a block of data and present it to anyone for instance to the processing node. ¹⁾