ABCore is a wrapper for Bitcoin Core for Android.

Bitcoin Core (formerly Bitcoin-Qt) is the bitcoin daemon software based on

the original reference code by Satoshi Nakamoto. It is programmed to decide

which block chain contains valid transactions. The users of Bitcoin Core

only accept transactions for that block chain, making it the Bitcoin block

chain that everyone else wants to use.

It is these users who keep Bitcoin decentralized. They individually run

their own Bitcoin Core full nodes, and each of those full nodes separately

follows the exact same rules to decide which block chain is valid.

There's no voting or other corruptible process involved: there's just

individual software following identical rules—"math"—to evaluate identical

blocks and coming to identical conclusions about which block chain is

valid.

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