XPM Prime Explorer symbol
XPMPrime Explorer
Home/Chain Registry/Block #2,084,950

Block #2,084,950

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 4/23/2017, 11:54:27 PM Β· Difficulty 10.8728 Β· 4,754,777 confirmations

TWN
Bi-Twin Chain

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

Block Header
Block Hash
80b8cc93953196f629dde92720332951e6839bf809d6813ad898a3bf27f0580c
View on Chainz β†—

Difficulty

10.872819

Transactions

1

Size

199 B

Version

2

Bits

0adf7112

Nonce

1,802,216,652

Timestamp

4/23/2017, 11:54:27 PM

Confirmations

4,754,777

Merkle Root

c13c6a8d585c56f2c256c83e3b764140166a231923b2d5409ca101b755387efc
Transactions (1)
Coinbasec13c6a8d585c56…a101b755387efc
1 in β†’ 1 out8.4500 XPM109 B
AVgpgELk…oSRnovb4
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.

1.889 Γ— 10⁹⁡(96-digit number)
18890517434125500256…06985130982776836160
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
1.889 Γ— 10⁹⁡(96-digit number)
18890517434125500256…06985130982776836159
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
1.889 Γ— 10⁹⁡(96-digit number)
18890517434125500256…06985130982776836161
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
3.778 Γ— 10⁹⁡(96-digit number)
37781034868251000513…13970261965553672319
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
3.778 Γ— 10⁹⁡(96-digit number)
37781034868251000513…13970261965553672321
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
7.556 Γ— 10⁹⁡(96-digit number)
75562069736502001026…27940523931107344639
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
7.556 Γ— 10⁹⁡(96-digit number)
75562069736502001026…27940523931107344641
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
1.511 Γ— 10⁹⁢(97-digit number)
15112413947300400205…55881047862214689279
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
1.511 Γ— 10⁹⁢(97-digit number)
15112413947300400205…55881047862214689281
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
3.022 Γ— 10⁹⁢(97-digit number)
30224827894600800410…11762095724429378559
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
3.022 Γ— 10⁹⁢(97-digit number)
30224827894600800410…11762095724429378561
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 2084950

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 80b8cc93953196f629dde92720332951e6839bf809d6813ad898a3bf27f0580c

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 #2,084,950 on Chainz β†—
Circulating Supply:57,962,100 XPMΒ·at block #6,839,726 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