Krzysztof Jurewicz | EN

How to let senders prioritize your inbox and be happy with that

Mon, 08 Jun 2020 00:00:00 +0200

Your attention is precious. Value it.

A serverless ebook store — proof of concept

Tue, 26 Nov 2019 00:00:00 +0100

Among the design goals mentioned in the Ercoin’s whitepaper are:

Ercoin story

Tue, 08 Oct 2019 00:00:00 +0200

This post describes Ercoin story and sketches its place in the cryptocurrency ecosystem. For more pracical information, see the announcement of version 1.0.0 beta and the announcement of Initial Burn Offering.

A new cryptocurrency

Mon, 07 Aug 2017 00:00:00 +0200

I’ve released the code of a cryptocurrency I’ve been writing, currently named Ercoin. Planned features:

What can be found inside BlackCoin’s blockchain

Tue, 04 Jul 2017 00:00:00 +0200

Bitcoin-related cryptocurrencies contain the OP_RETURN opcode which can be used to create unspendable outputs, optionally containing some associated data. Usage of this opcode is generally not encouraged due to a threat of blockchain bloat, though if proper fee policy was introduced, it should do no harm. BlackCoin since version 1.2.3 contains a command named “burn” which creates such outputs.

Application Blockchain Interface servers in Erlang

Tue, 04 Apr 2017 00:00:00 +0200

abci_server has been released. It allows writing Application Blockchain Interface servers in Erlang. Basically a developer writes a state machine and abci_server along with Tendermint takes care of the blockchain consensus.

General balanced binary Merkle trees for Erlang

Tue, 28 Mar 2017 00:00:00 +0200

gb_merkle_trees Erlang library has been released. It provides a dictionary-like storage for binaries using general balanced binary Merkle trees.

BlackCoin packages for Fedora

Wed, 22 Jun 2016 00:00:00 +0200

The official BlackCoin binaries for Linux seem to be targeted for Ubuntu-related systems and don’t generally work on Fedora. Below are BlackCoin packages v1.2.4-1 for Fedora 24 and 25 (x86_64 architecture), containing both the blackcoin-qt and blackcoind binaries. Packages are signed using my PGP key.

A Jekyll plugin for template translation

Sat, 09 Apr 2016 00:00:00 +0200

I’ve released a simple Jekyll plugin used to translate templates on this site.

A Jekyll plugin for Paspagon

Tue, 22 Mar 2016 00:00:00 +0100

I’ve written a Jekyll plugin which allows selling blog posts for Bitcoin and BlackCoin, using Amazon S3 and Paspagon. Key features: