Trying to understand nbits value from stratum protocol

0 votes

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 in Blockchain by sabby
• 4,350 points
62 views

1 answer to this question.

0 votes

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 Perry
• 17,020 points

Related Questions In Blockchain

0 votes
1 answer

How to get return value from solidity contract?

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

answered Aug 16, 2018 in Blockchain by slayer
• 29,050 points
465 views
0 votes
1 answer

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

answered Sep 6, 2018 in Blockchain by digger
• 27,630 points
36 views
0 votes
1 answer
0 votes
2 answers
0 votes
1 answer

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

yes all are over TCP/IP connections secured by TLS encryption in hashgraph architecture-hashgraph, ...READ MORE

answered Aug 6, 2018 in Blockchain by ariaholic
• 7,340 points
75 views
0 votes
1 answer

Truffle tests not running after truffle init

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

answered Sep 11, 2018 in Blockchain by Christine
• 15,790 points
138 views
0 votes
1 answer
+1 vote
2 answers

How to return value from a chaincode in Hyperledger Fabric?

Hyperledger Fabric supports only 2 types of ...READ MORE

answered Jun 13, 2018 in Blockchain by Perry
• 17,020 points
804 views
+1 vote
4 answers