The Proof-of-Proof consensus protocol enables blockchains to inherit proof-of-work security from other blockchains, creating an ecosystem wherein security originates on established blockchains like Bitcoin and extends to other blockchains. Such an ecosystem creates indirect scalability of Bitcoin by utilizing it as a security mechanism for purposebuilt chains. Current progress in other areas of scalability, including off-chain transactional networks and sidechains, benefit from a hierarchical security model which enables all blockchains to operate under the security context of Bitcoin. We propose a means for this inheritance without the involvement or approval of Bitcoin miners, without any centralized entities or federated nodes, and without imposing any technological limitations on blockchains which adopt this protocol.