XPM Prime Explorer symbol
XPMPrime Explorer
Home/Chain Registry/Block #2,855,191

Block #2,855,191

TWNLength 11β˜…β˜…β˜…β˜†β˜†

Bi-Twin Chain Β· Discovered 9/26/2018, 12:22:57 AM Β· Difficulty 11.7033 Β· 3,975,809 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
cf1bd38fda9245081257caf084346113f97d0315cf37242b1ad4188a5ae55ef0
View on Chainz β†—

Difficulty

11.703333

Transactions

1

Size

200 B

Version

2

Bits

0bb40da0

Nonce

895,603,415

Timestamp

9/26/2018, 12:22:57 AM

Confirmations

3,975,809

Merkle Root

93b601a802ce69aeb225496ba02ed5c709cc384a2fec680cdecfb2976861836d
Transactions (1)
Coinbase93b601a802ce69…cfb2976861836d
1 in β†’ 1 out7.2900 XPM110 B
AUMQRepm…tAfKmdW1
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.

4.828 Γ— 10⁹⁴(95-digit number)
48288731332317418012…33092591801957980800
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
4.828 Γ— 10⁹⁴(95-digit number)
48288731332317418012…33092591801957980799
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
4.828 Γ— 10⁹⁴(95-digit number)
48288731332317418012…33092591801957980801
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
9.657 Γ— 10⁹⁴(95-digit number)
96577462664634836024…66185183603915961599
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
9.657 Γ— 10⁹⁴(95-digit number)
96577462664634836024…66185183603915961601
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
1.931 Γ— 10⁹⁡(96-digit number)
19315492532926967204…32370367207831923199
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
1.931 Γ— 10⁹⁡(96-digit number)
19315492532926967204…32370367207831923201
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
3.863 Γ— 10⁹⁡(96-digit number)
38630985065853934409…64740734415663846399
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
3.863 Γ— 10⁹⁡(96-digit number)
38630985065853934409…64740734415663846401
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
7.726 Γ— 10⁹⁡(96-digit number)
77261970131707868819…29481468831327692799
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
7.726 Γ— 10⁹⁡(96-digit number)
77261970131707868819…29481468831327692801
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^4 Γ— origin + 1 βˆ’ 2^4 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 5 β€” Twin Prime Pair (2^5 Γ— origin Β± 1)
2^5 Γ— origin βˆ’ 1
1.545 Γ— 10⁹⁢(97-digit number)
15452394026341573763…58962937662655385599
Verify on FactorDB β†—Wolfram Alpha β†—

What this block proved

The miner who found this block proved the existence of 11 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
RareChain length 11
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 2855191

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 cf1bd38fda9245081257caf084346113f97d0315cf37242b1ad4188a5ae55ef0

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 #2,855,191 on Chainz β†—
Circulating Supply:57,892,140 XPMΒ·at block #6,830,999 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