Block #2,618,858

1CC0b.6f64fd

Discovered 4/18/2018, 2:12:41 AM · Difficulty 11.2426 · 4,173,374 confirmations

Block Header

Block Hash

f1c94ad84f89e4c7039d24bc49cf2428cade911d87c1c165a910e06ffdc26fd9

View on Chainz ↗

Height

#2,618,858

Difficulty

11.242550

Transactions

Size

94.31 KB

Version

Bits

0b3e17c6

Nonce

1,888,109,089

Timestamp

4/18/2018, 2:12:41 AM

Confirmations

4,173,374

Merkle Root

0489d00af61fa5a9bcc0d0cc8047929b8355887e67b9ce44850e7c1248b4480d

Transactions (2)

Coinbasebd533bac41f979…930ba4231ea37a

1 in → 1 out8.8700 XPM110 B

AZfPqZNJ…4xVyjsbT

0dca2cca95b0f6…efb1ae47502573

651 in → 1 out650.0000 XPM94.12 KB

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.

8.267 × 10⁹¹(92-digit number)

82678854370235602038…41225764663667265980

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.6f64fd formula:

Cross-reference on Chainz Explorer