Block #1,252,880
TWN0a.ecd1b2Discovered 9/25/2015, 12:06:16 PM · Difficulty 10.7864 · 5,537,143 confirmations
Height
#1,252,880
Difficulty
10.786415
Transactions
3
Size
1.36 KB
Version
2
Bits
0ac9527f
Nonce
982,926,170
Timestamp
9/25/2015, 12:06:16 PM
Confirmations
5,537,143
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 TWN0a.ecd1b2 formula: