Block #31,098
2CC07.fde416Discovered 7/13/2013, 9:59:27 PM · Difficulty 7.9881 · 6,758,256 confirmations
Height
#31,098
Difficulty
7.988098
Transactions
3
Size
1.12 KB
Version
2
Bits
07fcf3ff
Nonce
168
Timestamp
7/13/2013, 9:59:27 PM
Confirmations
6,758,256
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 2CC07.fde416 formula: