First merged mining (Namecoin AuxPoW)

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fa be 6d 6d — AuxPoW merged-mining marker (Namecoin)

The first merged-mining commitment on Bitcoin. Merged mining lets a miner secure a second chain with the same work, by committing that chain's block header inside the Bitcoin coinbase. Namecoin enabled it on 2011-09-19, and this block — 148,744, three weeks later — carries the first commitment to appear on the Bitcoin side. The magic bytes fa be 6d 6d (\xfa\xbe"mm") introduce a 32-byte auxiliary block-header merkle root. Because Namecoin was the only merge-mined chain at the time, this first marker is unambiguously Namecoin; every later one commits an opaque root that cannot be attributed to any particular chain from Bitcoin alone.