DigiByte is multi-algorithm, so this brings in six hash functions:
SHA256d and Scrypt in JS, and Qubit, Skein, Groestl and Odocrypt from
DigiByte Core's own C sources compiled to WebAssembly (packages/p2p/native,
emscripten via docker). Each header is checked against its nBits target and
the network powLimit before it can enter the chain; a peer serving an
invalid or future-dated header is benched. Competing branches are accepted
only when they carry more accumulated work than what they replace.
npm run pow:test -w @dgb-wallet/p2p verifies real mainnet headers of all
six algorithms and that a tampered header fails.
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