pub const SEGWIT_ACTIVATION_TESTNET: u64 = 834_624; // 834_624u64Expand description
SegWit (BIP141) - Testnet activation height (Bitcoin Core testnet3 consensus.SegwitHeight)
Reference: Bitcoin Core kernel/chainparams.cpp (CTestNetParams).
Same height as BIP147 (NULLDUMMY) on testnet3.