Hey y’all I was joking earlier about Monero having it’s Y2K moment, but I think I actually found a future bug. LMDB uses a uint64_t to store the cumulative number of coins up to a given block height in mdb_block_info. That value is going to overflow in about 1.8 years. At that point, tx fee verification is undefined

The method interface that accesses that value is BlockchainDB::get_block_already_generated_coins and the Blockchain::check_fee method is used to allow/disallow transactions to enter the mempool so the network might come to a grinding halt when that happens

No, it's just a 64-bit value that gets capped to 2^64 - 1

it's used to calculate block reward, so values >= 2^64 are not needed

Thanks for the pointer :)

That’s a weird way to do it but I guess it works

That’s good to know

And it's less than a year until it reaches 2^64 - on June 6, 2024 by my calculations.

I was using coin gecko’s total supply number which I think is behind

Hello Guys

i hope you are doing well :)

Could someone tell me, why this simple call to monero daemon not works? its such a simple call, but the daemon does reply nothing...

{"jsonrpc":"2.0","id":0,"method":"get_block_header_by_height","params":{"height":912345}}

,please

i m connecting via tcp socket

No one can tell you because you didn't tell anything about how exactly you send this simple call

hi sech

what software you use? What is the command line you use? Your OS? Where is the monerod running, locally or not?

monerod command line?

firewall settings?

curl 127.0.0.1:18081/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"get_block_header_by_height","params":{"height":912345}}' -H 'Content-Type: application/json'

no i send it from code with tcpclient

this one 100% works if you run it on the same PC as monerod

yes , i run it on same machine

tcpclient? What is it?

.net c#

its a socket client

what programming language? Do you know it should be an HTTP request with this json?

no,i did not know

ok, then this is the issue

you took this json from getmonero.org/resources/developer-g…rpc.html#get_block_header_by_height probably, and it shows curl as an example

thank you very much

curl does HTTP requests

i did not know, sech. thank you

I don't know much about C#, but it should have some standard way to send HTTP POST requests

yes

hmm. which type of method does curl use ? post or get , i tried both, everytime is the response empty, or i get 404 error

HTTP POST

"-d" in curl command line makes it a POST request

ok thx

even with httppost i get 404

the daemon binds 127.0.0.1:18081,but i m not able to find it

do you set URL = "/json_rpc" ?

nooo, really i have to ?

hmm, fck

i willtry

brb

same Problem 404..Id = 3, Status = RanToCompletion, Method = "{null}", Result = "StatusCode: 404

404 means you use wrong url

HTTP url must be "/json_rpc" in your request

just use wireshark and compare what curl sends and what you send

ok

ttp://127.0.0.1:18081/json_rpc

i use that

http

....

or it has to be 127.0.0.1:18081/json_rpc ?

url is "/json_rpc"

you connect to 127.0.0.1, port 18081

and then provide url "/json_rpc" and HTTP POST data will be the actual json request

okay, I see C# HttpClient needs fully qualified url

so yes, 127.0.0.1:18081/json_rpc

thank you sech

interesting

even curl is unable to reach daemon : pastebin.com/6X2hn9DW

What's your monerod command line?

actually, you did get a response from monerod

"message": "Parse error"

you're running on Windows, right?

curl 127.0.0.1:18081/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"get_block_header_by_height","params":{"height":912345}}' -H 'Content-Type: application/json'

yes

curl 127.0.0.1:18081/json_rpc -d "{\"jsonrpc\":\"2.0\",\"id\":\"0\",\"method\":\"get_block_header_by_height\",\"params\":{\"height\":912345}}" -H "Content-Type: application/json"

this is for Windows

ohhh ok

you are right

daemon replies

with curl

hmm

sech

my code is working now, httcclient just sucks

i m using now webclient and it works like a charm..Thank you !

till next time :)

hey

i m studying monero daemon rpc documentation

What is the pow hash please ? Is that the hash you have to run through randomx function ?

And where is the merkle tree? is it possible to to request merkle tree from daemon ?

Pascal123: You work with C#, right? Depending on what you want to do it would be much easier to use this library instead of firing off requests yourself: moneroecosystem.org/monero-csharp

hi rbrunner

oh ok, i did not know this exists

i would like to get the computed merkle tree from a block, is that possible ?

Not sure, maybe that's not available over the RPC interface, and you would have to read blocks yourself, in the style of a block explorer ...

im interested in writing a tiny pool software in c#

You sure you need that?

Ah, ok, then maybe, yes

education purposes

Yeah. Will certainly be interesting, but maybe quite a "steep learning curve". Maybe you have to look at existing pool software, in other languages

but i dont know how to get the merkle root of a block..i dont want to port existing c++ code

I guess much is not properly documented because so damn few people write pool software :)

hmm okey...

i would like to be able to generate mining blob manually

there is not much documentation on it, apart from wikipedia/bitcoinwiki pages and the code itself

but isnt the monero merkle different than the merkle tree of bitcoin?

it uses different base hashing function

but the structure is the same ?

yes

bitcoin uses sha256 and monero keccak, right ?

why monero use keccak ?

because it's more modern and secure than SHA-256

ah ok

keccak is basically SHA-3

well, i will try to implement it...thank you

could i use sha3,too ? is the result the same ?

No, parameters are a bit different

Monero uses earlier version with different parameters because it came out in 2014, and SHA-3 was finalized later

hmm ok

.merge+ 8903 8904 8905 8908

Added

One initial hash of merkle tree is computed by coinbase.. has monero a coinbase info, too or it is different? Coinbase = Coinb1 + ExtraNonce1 + ExtraNonce2 + Coinb2;

if monero does not have a coinbase info, could i use first transaction as initialization hash ?

good night guys