Block #116,637

2CC09.d00689

Discovered 8/14/2013, 1:17:11 PM · Difficulty 9.7487 · 6,679,028 confirmations

Block Header

Block Hash

e4562f38a60652e0ec007df17c8273400be46fc9074b11869dade8fbd7529052

View on Chainz ↗

Height

#116,637

Difficulty

9.748725

Transactions

Size

722 B

Version

Bits

09bfac79

Nonce

235,118

Timestamp

8/14/2013, 1:17:11 PM

Confirmations

6,679,028

Mined by

⛏️ P2SHAc8JKMuEpKqZZEFn1HKp5sh9AC4GJSK9zr

Merkle Root

9260782537c6b9c0c8099d149418fc88d7d134fd7a90c917ccc2a985df4b67eb

Transactions (2)

Coinbasef121cc5c069726…32afe05e8e5124

1 in → 1 out10.5200 XPM109 B

Ac8JKMuE…4GJSK9zr

8ad059776f1b75…c41bc4f8604bf7

3 in → 2 out29.9305 XPM524 B

ALJB9Kua…dhjgKUM6 AcWNpkXk…cRTM3N8y

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.

8.844 × 10⁹²(93-digit number)

88449003436230482184…88004216219666660480

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 2CC09.d00689 formula:

Cross-reference on Chainz Explorer