Block #1,404,566

TWN0a.db7b18

Discovered 1/8/2016, 2:54:26 PM · Difficulty 10.8057 · 5,405,289 confirmations

Block Header

Block Hash

192c464f4d1531ba17d4d95f2f7c5465fb3ca9f509c8642f076c41ecf64deba2

View on Chainz ↗

Height

#1,404,566

Difficulty

10.805676

Transactions

Size

2.04 KB

Version

Bits

0ace40cf

Nonce

666,495,897

Timestamp

1/8/2016, 2:54:26 PM

Confirmations

5,405,289

Mined by

⛏️ P2SHAchhzDa9wnjNctofMHX9dXWS9LipsAz1aH

Merkle Root

926060dd21da49795a589fa8317252516bf5bd073dcaaa87ad8557508be9b853

Transactions (2)

Coinbase35521f101dde79…f5cb3f4cb2dc1b

1 in → 1 out8.5700 XPM109 B

AchhzDa9…ipsAz1aH

f6a201ec44349b…5c3b96120ffaee

1 in → 51 out4.0085 XPM1.85 KB

Aabrvz97…BNqKPEQ1 AW1RiJRF…QhwT7KtA AHZrh8s5…iZf7gQB3 AJt5FLeA…j3EiZySJ Adwznov4…H4nHN4o2

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.

9.895 × 10⁹⁵(96-digit number)

98958282579087663090…34677024116293404160

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 TWN0a.db7b18 formula:

Cross-reference on Chainz Explorer

Block #1,404,566

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