I'm looking at the stratum protocol and I'm having a problem with the nbits value of the mining.notify method. I have trouble calculating it, I assume it's the currency difficulty.

I pull a notify from a dogecoin pool and it returned 1b3cc366 and at the time the difficulty was 1078.52975077.

I'm assuming here that 1b3cc366 should give me 1078.52975077 when converted. But I can't seem to do the conversion right.

I've looked herehere and also tried the .NET function BitConverter.Int64BitsToDouble.

Can someone help me understand what the nbits value signify?

Sep 3, 2018 992 views

## 1 answer to this question.

You are right, nbits is current network difficulty.

Difficulty encoding is throughly described here.

Hexadecimal representation like 0x1b3cc366 consists of two parts:

• 0x1b -- number of bytes in a target
• 0x3cc366 -- target prefix

This means that valid hash should be less than 0x3cc366000000000000000000000000000000000000000000000000 (it is exactly 0x1b = 27 bytes long).

Floating point representation of difficulty shows how much current target is harder than the one used in the genesis block.

Satoshi decided to use 0x1d00ffff as a difficulty for the genesis block, so the target was0x00ffff0000000000000000000000000000000000000000000000000000.

And 1078.52975077 is how much current target is greater than the initial one:

```\$ echo 'ibase=16;FFFF0000000000000000000000000000000000000000000000000000 / 3CC366000000000000000000000000000000000000000000000000' | bc -l
1078.52975077482646448605```
answered Sep 3, 2018 by
• 17,100 points

## How to get return value from solidity contract?

Once you call a constant function, you ...READ MORE

## How to get a value from SQLite to convert it?

Server side: b = BtcConverter(force_decimal=True) p1btc = b.get_latest_price('USD') p1btcr = ...READ MORE

## How to Read multiple value from as JSON format from a external service and store in composer registry

Hey buddy,  this works: /** * Track temperatures ...READ MORE

## Is it possible to modify a variable value from another contract?

No, you can't directly edit a variable ...READ MORE

+1 vote

## How to perform a simple 1-to-1 Bitcoin Transaction with Bitcore?

What is the argument utxos int the ...READ MORE

+1 vote

## Protocols used in a distributed/dlt system for the nodes to establish communication

yes all are over TCP/IP connections secured ...READ MORE

## Truffle tests not running after truffle init

This was a bug. They've fixed it. ...READ MORE

## Hyperledger Sawtooth vs Quorum in concurrency and speed Ask

Summary: Both should provide similar reliability of ...READ MORE

+1 vote