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Home/Chain Registry/Block #1,246,579

Block #1,246,579

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 9/21/2015, 3:39:05 PM Β· Difficulty 10.7517 Β· 5,578,341 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
c51042c67eeddcc4b2b8fca04dc3042c9989b3e53ae1c3244d06bad69bb2a86d
View on Chainz β†—

Difficulty

10.751707

Transactions

1

Size

207 B

Version

2

Bits

0ac06fdc

Nonce

1,947,452,508

Timestamp

9/21/2015, 3:39:05 PM

Confirmations

5,578,341

Merkle Root

27ca137755e20e3cfec7499e560dc5f11b5246274b18584fd9c5df7d8714c06c
Transactions (1)
Coinbase27ca137755e20e…c5df7d8714c06c
1 in β†’ 1 out8.6400 XPM116 B
AJCEY9yy…tg97E6zm
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.

1.680 Γ— 10⁹⁢(97-digit number)
16805396723414572148…15934051889527609760
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
1.680 Γ— 10⁹⁢(97-digit number)
16805396723414572148…15934051889527609759
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
1.680 Γ— 10⁹⁢(97-digit number)
16805396723414572148…15934051889527609761
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
3.361 Γ— 10⁹⁢(97-digit number)
33610793446829144296…31868103779055219519
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
3.361 Γ— 10⁹⁢(97-digit number)
33610793446829144296…31868103779055219521
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
6.722 Γ— 10⁹⁢(97-digit number)
67221586893658288592…63736207558110439039
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
6.722 Γ— 10⁹⁢(97-digit number)
67221586893658288592…63736207558110439041
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
1.344 Γ— 10⁹⁷(98-digit number)
13444317378731657718…27472415116220878079
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
1.344 Γ— 10⁹⁷(98-digit number)
13444317378731657718…27472415116220878081
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
2.688 Γ— 10⁹⁷(98-digit number)
26888634757463315437…54944830232441756159
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
2.688 Γ— 10⁹⁷(98-digit number)
26888634757463315437…54944830232441756161
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 1246579

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 c51042c67eeddcc4b2b8fca04dc3042c9989b3e53ae1c3244d06bad69bb2a86d

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 #1,246,579 on Chainz β†—
Circulating Supply:57,843,437 XPMΒ·at block #6,824,919 Β· updates every 60s
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