Block #2,444,179

1CC0b.ef72a0

Discovered 12/27/2017, 11:44:50 AM · Difficulty 10.9376 · 4,352,635 confirmations

Block Header

Block Hash

703aaa967a62d2902242823acbc2bfa4d20376bf8b1282e721fa67f5941595cf

View on Chainz ↗

Height

#2,444,179

Difficulty

10.937636

Transactions

Size

243 B

Version

Bits

0af008e2

Nonce

1,118,752,910

Timestamp

12/27/2017, 11:44:50 AM

Confirmations

4,352,635

Mined by

⛏️ P2SHAKjaKd2Kxt1buNBYuJDadjFL1cDPsqUE8e

Merkle Root

200c966ed1a170c44bd75766a006ba58bf244b31f6e645ab9b20f896edd09194

Transactions (1)

Coinbase200c966ed1a170…20f896edd09194

1 in → 2 out8.3500 XPM152 B

AKjaKd2K…DPsqUE8e AXbk7f7A…Tx7JECPG

Prime Chain Origin

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.

4.636 × 10⁹⁶(97-digit number)

46365513156427408014…19594525622787952640

How Primecoin's Proof-of-Work Constructs These Primes

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.

Prime Chain Origin = First Prime × Primorial (2·3·5·7·11·…)

Source: Primecoin prime.cpp — CheckPrimeProofOfWork()

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 1CC0b.ef72a0 formula:

Cross-reference on Chainz Explorer