Block #2,151,609
1CC0a.f68114Discovered 6/8/2017, 12:13:12 PM · Difficulty 10.9002 · 4,642,790 confirmations
Height
#2,151,609
Difficulty
10.900193
Transactions
30
Size
8.40 KB
Version
2
Bits
0ae6730f
Nonce
75,143,392
Timestamp
6/8/2017, 12:13:12 PM
Confirmations
4,642,790
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.f68114 formula: