Block #62,375

1CC08.ffa698

Discovered 7/18/2013, 6:53:00 PM · Difficulty 8.9762 · 6,727,561 confirmations

Block Header

Block Hash

804fbdb34f4a637ab07f7b07400380d49e19d35eb3cfb877f569c7abdc3940d7

View on Chainz ↗

Height

#62,375

Difficulty

8.976192

Transactions

Size

504 B

Version

Bits

08f9e7b6

Nonce

221

Timestamp

7/18/2013, 6:53:00 PM

Confirmations

6,727,561

Merkle Root

870629b8bda9ec286b74b8ac7b6992bd4f6d039ee5aa430351da31d2c13a660c

Transactions (2)

Coinbasef8d1f4bb42c92f…efa30a08e78703

1 in → 1 out12.4000 XPM110 B

AK1JUKWL…oPR4rN5o

ab4cd408ed9e07…b9c98b854051e4

2 in → 2 out24.8500 XPM305 B

AWa7vz5H…NHUseges AQi9roZv…a6NMn7Fp

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.

8.874 × 10⁹²(93-digit number)

88746988816130222496…41916454261776389200

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 1CC08.ffa698 formula:

Cross-reference on Chainz Explorer