The Genesis Block
Block 0, mined by Satoshi on 3 January 2009. The header below is the real 80 bytes that were hashed. Change the nonce and watch the hash scatter: at the difficulty-1 target it takes about 4.3 billion attempts on average to land below it, and the nonce Satoshi settled on was 2,083,236,893.
Version
01000000
0x00000001 (little-endian)
Previous block
0000000000000000000000000000000000000000000000000000000000000000
All zeros, because nothing came before it
Merkle root
3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a
Hash of the only transaction (the coinbase)
Timestamp
29ab5f49
2009-01-03 18:15:05 UTC
Bits
ffff001d
0x1d00ffff (compact target)
Nonce
1dac2b7c
2083236893, the value Satoshi found by mining
Raw SHA256d output (32 bytes)
Displayed / explorer hash (byte-reversed)
0 leading zero bits