Block #381,564
1CC0a.e6a546Discovered 1/30/2014, 2:37:02 AM · Difficulty 10.4031 · 6,421,978 confirmations
Height
#381,564
Difficulty
10.403117
Transactions
8
Size
2.35 KB
Version
2
Bits
0a6732af
Nonce
299,252
Timestamp
1/30/2014, 2:37:02 AM
Confirmations
6,421,978
Mined by
Merkle Root
This is the prime chain origin stored in the block header. It is a composite number (not prime itself) — it equals the first prime in the chain multiplied by a primorial. The origin anchors the entire chain to this specific block.
Primecoin stores a value called the prime chain origin in each block. The miner found a large integer such that when divided by a primorial (the product of small primes: 2 × 3 × 5 × 7 × …), the result is the first prime in the chain. The origin is deliberately divisible by this primorial — that divisibility is part of the proof.
This is why the origin has many small prime factors — those factors are the primorial divisor. The chain then extends from the first prime using the 1CC0a.e6a546 formula: