XPM Prime Explorer symbol
XPMPrime Explorer
Home/Chain Registry/Block #844,943

Block #844,943

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 12/8/2014, 12:34:11 PM Β· Difficulty 10.9726 Β· 5,973,071 confirmations

TWN
Bi-Twin Chain

Interleaved pairs of primes that differ by 2, forming twin prime pairs at each level.

Block Header
Block Hash
d06889d96a27ee2c1f00a99d9e3e673e509f553da127f8f7b90e8e093859444f
View on Chainz β†—

Height

#844,943

Difficulty

10.972635

Transactions

1

Size

206 B

Version

2

Bits

0af8fea2

Nonce

167,726,303

Timestamp

12/8/2014, 12:34:11 PM

Confirmations

5,973,071

Merkle Root

c4cbfd7a4fed7edd1336749e110b13a0d8e3f026a384d37a94d48961c2447e8b
Transactions (1)
Coinbasec4cbfd7a4fed7e…d48961c2447e8b
1 in β†’ 1 out8.2900 XPM116 B
ANSXnLY2…Sd25TjkD
Prime Chain Origin

This is the prime chain origin stored in the block header. It is a composite number (not prime itself) β€” it equals the first prime in the chain multiplied by a primorial. The origin anchors the entire chain to this specific block.

1.581 Γ— 10⁹⁡(96-digit number)
15811428001936384203…41774684888397820710
Discovered Prime Numbers
Lower: 2^k Γ— origin βˆ’ 1 | Upper: 2^k Γ— origin + 1

These are the actual prime numbers discovered by this block, computed using the verified Primecoin formula. Each number has been independently confirmed to pass the Fermat primality test. Use the FactorDB links to verify any number independently.

Level 0 β€” Twin Prime Pair (origin Β± 1)
origin βˆ’ 1
1.581 Γ— 10⁹⁡(96-digit number)
15811428001936384203…41774684888397820709
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
1.581 Γ— 10⁹⁡(96-digit number)
15811428001936384203…41774684888397820711
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: origin + 1 βˆ’ origin βˆ’ 1 = 2 (twin primes βœ“)
Level 1 β€” Twin Prime Pair (2^1 Γ— origin Β± 1)
2^1 Γ— origin βˆ’ 1
3.162 Γ— 10⁹⁡(96-digit number)
31622856003872768407…83549369776795641419
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
3.162 Γ— 10⁹⁡(96-digit number)
31622856003872768407…83549369776795641421
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^1 Γ— origin + 1 βˆ’ 2^1 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 2 β€” Twin Prime Pair (2^2 Γ— origin Β± 1)
2^2 Γ— origin βˆ’ 1
6.324 Γ— 10⁹⁡(96-digit number)
63245712007745536814…67098739553591282839
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
6.324 Γ— 10⁹⁡(96-digit number)
63245712007745536814…67098739553591282841
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^2 Γ— origin + 1 βˆ’ 2^2 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 3 β€” Twin Prime Pair (2^3 Γ— origin Β± 1)
2^3 Γ— origin βˆ’ 1
1.264 Γ— 10⁹⁢(97-digit number)
12649142401549107362…34197479107182565679
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
1.264 Γ— 10⁹⁢(97-digit number)
12649142401549107362…34197479107182565681
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^3 Γ— origin + 1 βˆ’ 2^3 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 4 β€” Twin Prime Pair (2^4 Γ— origin Β± 1)
2^4 Γ— origin βˆ’ 1
2.529 Γ— 10⁹⁢(97-digit number)
25298284803098214725…68394958214365131359
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
2.529 Γ— 10⁹⁢(97-digit number)
25298284803098214725…68394958214365131361
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^4 Γ— origin + 1 βˆ’ 2^4 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)

What this block proved

The miner who found this block proved the existence of 10 consecutive prime numbers forming a Bi-Twin Chain. The prime chain origin β€” the large number shown above β€” anchors the chain and is divisible by a primorial (the product of small primes), cryptographically tying these prime numbers to this specific block.

View full Prime Chain Discovery page β†’
β˜…β˜…β˜†β˜†β˜†
Rarity
UncommonChain length 10
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 Γ— 3 Γ— 5 Γ— 7 Γ— …), the result is the first prime in the chain. The origin is deliberately divisible by this primorial β€” that divisibility is part of the proof.

Prime Chain Origin = First Prime Γ— Primorial (2Β·3Β·5Β·7Β·11·…)
Source: Primecoin prime.cpp β€” CheckPrimeProofOfWork()

This is why the origin has many small prime factors β€” those factors are the primorial divisor. The chain then extends from the first prime using the TWN formula:

TWN: twin pairs (p, p+2) where p = origin/primorial βˆ’ 1 and p+2 = origin/primorial + 1
Verify on a Primecoin Node

Anyone running a Primecoin node can independently verify this block using the following RPC commands. Run these from the primecoin-cli command line or via the debug console in the Primecoin wallet.

1. Get block hash by height
getblockhash 844943

Returns the block hash for a given block height. Use this to confirm the hash shown above matches the chain.

2. Get full block data
getblock d06889d96a27ee2c1f00a99d9e3e673e509f553da127f8f7b90e8e093859444f

Returns the full block header including difficulty, prime chain origin, prime chain type, transaction IDs, and all other fields shown on this page.

How to run these commands: To verify this data independently, open a terminal on your own Primecoin node and run primecoin-cli <command>. Alternatively, open the Primecoin-Qt wallet, go to Help β†’ Debug Window β†’ Console, and type the command directly. The node must be fully synced to this block height for the commands to return results.

Cross-reference on Chainz Explorer

Chainz is an independent Primecoin block explorer. Compare this block's data to verify accuracy.

View Block #844,943 on Chainz β†—
Circulating Supply:57,788,179 XPMΒ·at block #6,818,013 Β· updates every 60s
xpmprime.info is a work in progress. If you enjoy using this service you can support this project with a Primecoin donation.
Privacy PolicyΒ·
AQZeJoQ81VgeHQBpEYTgvNqV1gnz3L5SvK

Cookie Preferences

We use cookies to enhance your experience. Some are essential for the site to function, while others help us understand how you use the site.

Β·Privacy Policy