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Block #33,174

TWNLength 7β˜…β˜†β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 7/14/2013, 4:21:24 AM Β· Difficulty 7.9915 Β· 6,776,402 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
6833ef1225e1f6dc8e43a1be4cd4645794bfc39a891d1855e27a0666544ec540
View on Chainz β†—

Height

#33,174

Difficulty

7.991546

Transactions

1

Size

201 B

Version

2

Bits

07fdd5fd

Nonce

216

Timestamp

7/14/2013, 4:21:24 AM

Confirmations

6,776,402

Merkle Root

9f5c3ca0db821b2e81cf7469e39e9954776be809735378fc1ac8056b81470b87
Transactions (1)
Coinbase9f5c3ca0db821b…c8056b81470b87
1 in β†’ 1 out15.6400 XPM109 B
AKSwr9eU…dLNxuVyn
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.

1.700 Γ— 10⁹⁹(100-digit number)
17007849446910445383…27905380667584178100
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
1.700 Γ— 10⁹⁹(100-digit number)
17007849446910445383…27905380667584178099
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
1.700 Γ— 10⁹⁹(100-digit number)
17007849446910445383…27905380667584178101
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
3.401 Γ— 10⁹⁹(100-digit number)
34015698893820890767…55810761335168356199
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
3.401 Γ— 10⁹⁹(100-digit number)
34015698893820890767…55810761335168356201
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
6.803 Γ— 10⁹⁹(100-digit number)
68031397787641781535…11621522670336712399
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
6.803 Γ— 10⁹⁹(100-digit number)
68031397787641781535…11621522670336712401
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
1.360 Γ— 10¹⁰⁰(101-digit number)
13606279557528356307…23243045340673424799
Verify on FactorDB β†—Wolfram Alpha β†—

What this block proved

The miner who found this block proved the existence of 7 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
CommonChain length 7
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 33174

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 6833ef1225e1f6dc8e43a1be4cd4645794bfc39a891d1855e27a0666544ec540

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 #33,174 on Chainz β†—
Circulating Supply:57,720,685 XPMΒ·at block #6,809,575 Β· updates every 60s
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