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Block #309,294

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 12/13/2013, 12:59:44 PM Β· Difficulty 9.9948 Β· 6,502,579 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
cbc1d9bc5768bc1afcf293dc98a905509cb40b11fbe2eca9cfafa39941ea86be
View on Chainz β†—

Height

#309,294

Difficulty

9.994780

Transactions

1

Size

211 B

Version

2

Bits

09fea9e6

Nonce

5,486

Timestamp

12/13/2013, 12:59:44 PM

Confirmations

6,502,579

Merkle Root

16510b5dedd4d567407978df436534748880d4a8a8898e562e0fb0467b317495
Transactions (1)
Coinbase16510b5dedd4d5…0fb0467b317495
1 in β†’ 1 out10.0000 XPM116 B
AbwWkWZt…kawDhufa
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.

6.854 Γ— 10¹⁰⁡(106-digit number)
68540145614363147048…55423130248109096960
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
6.854 Γ— 10¹⁰⁡(106-digit number)
68540145614363147048…55423130248109096959
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
6.854 Γ— 10¹⁰⁡(106-digit number)
68540145614363147048…55423130248109096961
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
1.370 Γ— 10¹⁰⁢(107-digit number)
13708029122872629409…10846260496218193919
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
1.370 Γ— 10¹⁰⁢(107-digit number)
13708029122872629409…10846260496218193921
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
2.741 Γ— 10¹⁰⁢(107-digit number)
27416058245745258819…21692520992436387839
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
2.741 Γ— 10¹⁰⁢(107-digit number)
27416058245745258819…21692520992436387841
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
5.483 Γ— 10¹⁰⁢(107-digit number)
54832116491490517638…43385041984872775679
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
5.483 Γ— 10¹⁰⁢(107-digit number)
54832116491490517638…43385041984872775681
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
1.096 Γ— 10¹⁰⁷(108-digit number)
10966423298298103527…86770083969745551359
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
1.096 Γ— 10¹⁰⁷(108-digit number)
10966423298298103527…86770083969745551361
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 309294

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 cbc1d9bc5768bc1afcf293dc98a905509cb40b11fbe2eca9cfafa39941ea86be

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 #309,294 on Chainz β†—
Circulating Supply:57,739,077 XPMΒ·at block #6,811,872 Β· updates every 60s
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