Block #2,619,689

2CC0b.c1229e

Discovered 4/18/2018, 3:37:54 PM · Difficulty 11.2467 · 4,175,854 confirmations

Block Header

Block Hash

5891cb07bccef8cbcf14474c909ccf74fc645fb4bf81273f6ccf53238dd8ffde

View on Chainz ↗

Height

#2,619,689

Difficulty

11.246653

Transactions

Size

97.39 KB

Version

Bits

0b3f24a2

Nonce

716,565,149

Timestamp

4/18/2018, 3:37:54 PM

Confirmations

4,175,854

Mined by

⛏️ P2SHANvFdY3UofyZ27YaUd4Xvmtg2m2uBo7NXw

Merkle Root

d93bf02003882359f2d6cd10084e5ec1683347c1416647155fb715883a784c17

Transactions (2)

Coinbase859d508188619e…ae4e273da28f56

1 in → 1 out8.8900 XPM110 B

ANvFdY3U…2uBo7NXw

5639f8cb13e448…c99bdedf82c0b6

672 in → 2 out400.0100 XPM97.20 KB

ARsTDcWN…fAcJXLLg ALPF8J52…Hjw4BMsG

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.

8.776 × 10⁹⁴(95-digit number)

87766177753079343820…61119945075160964480

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 2CC0b.c1229e formula:

Cross-reference on Chainz Explorer