Block #2,501,128
TWN0b.afc754Discovered 2/1/2018, 6:09:51 PM · Difficulty 10.9767 · 4,289,815 confirmations
Height
#2,501,128
Difficulty
10.976708
Transactions
3
Size
1.36 KB
Version
2
Bits
0afa0987
Nonce
682,004,390
Timestamp
2/1/2018, 6:09:51 PM
Confirmations
4,289,815
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 TWN0b.afc754 formula: