Block #49,176

1CC08.deda30

Discovered 7/15/2013, 6:59:30 PM · Difficulty 8.8600 · 6,740,764 confirmations

Block Header

Block Hash

e19b92a24e017fbe2b90c125778131123665ab379ec50a032a879e4dbce7b316

View on Chainz ↗

Height

#49,176

Difficulty

8.860022

Transactions

Size

430 B

Version

Bits

08dc2a63

Nonce

118

Timestamp

7/15/2013, 6:59:30 PM

Confirmations

6,740,764

Merkle Root

52a8c2a8d7d673fa30e0aa34b735fe96515422976c6ed1ecff30110c5886a216

Transactions (2)

Coinbase24c146928fc72c…12563681fd02be

1 in → 1 out12.7300 XPM110 B

AbPqRgFc…ubgWWNGM

8197bf2005a9ef…1c19c284d1ad9e

1 in → 2 out12.9500 XPM227 B

AKWjRZE8…xFKE5mQP AKXG5vUo…7NyYyifR

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.

2.074 × 10¹⁰¹(102-digit number)

20745905697651600475…75531342140630008160

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.deda30 formula:

Cross-reference on Chainz Explorer