XPM Prime Explorer symbol
XPMPrime Explorer
Home/Chain Registry/Block #1,493,690

Block #1,493,690

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 3/12/2016, 11:04:48 AM Β· Difficulty 10.6655 Β· 5,336,765 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
c7ddd1eafe04c499294a5b0bda3d697cc0169455fe48ee108c5aeae7aaeeeec6
View on Chainz β†—

Difficulty

10.665476

Transactions

1

Size

200 B

Version

2

Bits

0aaa5ca0

Nonce

401,663,636

Timestamp

3/12/2016, 11:04:48 AM

Confirmations

5,336,765

Merkle Root

fea3fae7932bb99af88f0eda02185806fe1c8ba46e4f2a034b3b3f60fcab14c1
Transactions (1)
Coinbasefea3fae7932bb9…3b3f60fcab14c1
1 in β†’ 1 out8.7800 XPM110 B
ANhQpHdM…T16MR6gU
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.

7.775 Γ— 10⁹⁡(96-digit number)
77752849680531346021…63578401006932131840
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
7.775 Γ— 10⁹⁡(96-digit number)
77752849680531346021…63578401006932131839
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
7.775 Γ— 10⁹⁡(96-digit number)
77752849680531346021…63578401006932131841
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
1.555 Γ— 10⁹⁢(97-digit number)
15550569936106269204…27156802013864263679
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
1.555 Γ— 10⁹⁢(97-digit number)
15550569936106269204…27156802013864263681
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
3.110 Γ— 10⁹⁢(97-digit number)
31101139872212538408…54313604027728527359
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
3.110 Γ— 10⁹⁢(97-digit number)
31101139872212538408…54313604027728527361
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
6.220 Γ— 10⁹⁢(97-digit number)
62202279744425076816…08627208055457054719
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
6.220 Γ— 10⁹⁢(97-digit number)
62202279744425076816…08627208055457054721
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
1.244 Γ— 10⁹⁷(98-digit number)
12440455948885015363…17254416110914109439
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
1.244 Γ— 10⁹⁷(98-digit number)
12440455948885015363…17254416110914109441
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 1493690

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 c7ddd1eafe04c499294a5b0bda3d697cc0169455fe48ee108c5aeae7aaeeeec6

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 #1,493,690 on Chainz β†—
Circulating Supply:57,887,886 XPMΒ·at block #6,830,454 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