Block #2,617,611

TWN0b.8460ee

Discovered 4/17/2018, 6:42:15 AM · Difficulty 11.2310 · 4,176,859 confirmations

Block Header

Block Hash

0251add28e60c1f1405bd857a2e46fff35e2ff0e34017d6a20725ba9724d441d

View on Chainz ↗

Height

#2,617,611

Difficulty

11.230982

Transactions

Size

91.00 KB

Version

Bits

0b3b219b

Nonce

262,339,267

Timestamp

4/17/2018, 6:42:15 AM

Confirmations

4,176,859

Mined by

⛏️ P2SHAKqs5UZGz9kPYWgsDG24gDVC36BTpFzEEr

Merkle Root

911f817f1a7d885dee4db7470308bd4aaa7671bf5e15ca9c86d33c878f0fdb67

Transactions (2)

Coinbase2129471f69aebe…0687402f0cd6a1

1 in → 1 out8.8500 XPM109 B

AKqs5UZG…BTpFzEEr

5b07a1ee81d380…5550e432c14630

628 in → 1 out650.0000 XPM90.81 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.

4.826 × 10⁹⁴(95-digit number)

48260993794994793771…02602690552321933080

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 TWN0b.8460ee formula:

Cross-reference on Chainz Explorer