Sources and Credits
Status: Live
The code, documents, data and writing these pages cite, and the work Pixa is built on. Last checked 2026-10-06; the price feed's sources on 2026-11-03.
Each page cites its sources where it uses them. This page gathers them in one register: code with the commit cited and the licence its repository states, then documents, data, books and articles. Live values are not repeated here; each page gives the API call that returns them and the date it was read.
Code
| Repository | What the pages draw from it | Commit cited | Licence stated in the repository |
|---|---|---|---|
| pixagram-blockchain/pixagram | The chain node, hived 1.30.0: every protocol rule and number | 48f75a2 (1.29.0, 2026-09-18) for rules hardfork 30 left unchanged; tag v1.30.0, 746118e, 2026-10-07, for those it changed |
MIT |
| pixagram-blockchain/pixagram-ui-dev | The app at pixagram.com: sign-up, keys, the artwork editor, the wallet, governance and communities | ca1d157, 2026-10-04 |
GPL-3.0 (LICENSE); package.json says MIT |
| pixagram-blockchain/hivemind | The social layer: feeds, communities and roles | 5765e21, 2026-08-18 |
MIT |
| pixagram-blockchain/dpixa | The JavaScript library in the developer examples, a fork of dhive | fddb47d, 2026-05-01 |
BSD-3-Clause-No-Military-License |
| pixagram-blockchain/pixagram-node | Node configurations, including the API node's plugins and the gateway | 4a271e8, 2026-10-07; the gateway files are unchanged since 7e57cca, 2026-09-22 |
MIT |
| pixagram-blockchain/witness | The witness setup | e3b8841, 2026-10-07 |
No licence file |
| pixagram-blockchain/bigmac-feed | The price feed the witness repository ships: a local Big Mac, PIXA's fair value from the order book, currency conversion |
11f8ad1 (v1.3.0), 2026-10-30; earlier c88c43c (v1.0.3), 2026-09-07 |
No licence file |
| pixagram-blockchain/bigmac-feed-agnostic | The first feed with a local Big Mac, market pairings and currency conversion; superseded by bigmac-feed v1.3.0 |
96b9d4a, 2026-09-07 |
GPL-3.0 |
| pixagram-blockchain/witness-status | The witness status page | a376149, 2026-09-22 |
MIT |
| pixagram-blockchain/paph-js | PAPH, a perceptual hash for pixel art; not used by the app | 8959a08, 2026-10-06 |
MIT |
| openhive-network/hive | Hive's code, for comparison | Release 1.28.7, 1584099, 2026-07-10 |
MIT |
| steemit/steem | Steem's code: escrow and the private-message plugin; its issue #143, "Add Escrow Operations" | Release 0.14.2, b0e3644 |
MIT |
| steemit/condenser | The code of steemit.com | Searched at snapshots from 2016-09 to 2020-03 | MIT (package.json) |
| sharp | The image library in an encoding example | — | See its site |
Documents
| Document | Edition | What the pages use it for |
|---|---|---|
| Steem whitepaper | March 2016, archived | What Steem said at launch: Steem Dollars, rewards, the price feed |
| Steem whitepaper | July 2025, steem.com | Steem's current description, including escrow payments |
| Steem Bluepaper | 2017 | Proof-of-Brain and escrow |
| Hive whitepaper | 2020 | Resource Credits and what Hive changed |
| PXS design notes | Pixagram, June 2026; not published | The design of PXS, cited by section |
| WebP specifications | Container and lossless bitstream, Google | The artwork format |
| Hive developer portal | developers.hive.io | The API that Pixa shares with Hive |
| pixa.org node operator guide | Run a Pixagram node, version 1.0, 2026-09-05 | Setting up a witness and an API node |
| Docker documentation | Merge Compose files | Running an API node |
Data
| Source | What it gives | Pages |
|---|---|---|
The Pixa chain, through api.pixagram.com and the other public nodes |
Every live value, named with its API call and the date it was read | All |
| Steem and Hive, through public API nodes and SteemWorld | Blocks, hardfork dates and operations since 2016 | From STEEM to HIVE to PIXA, From SBD to PXS, The Plan Revisited |
| Golos, through its explorer | Golos's first blocks | From STEEM to HIVE to PIXA |
| The Economist, Big Mac index data | Big Mac prices for the feed. The data are published under CC BY 4.0 and the software under MIT. | Oracle and Price Feed |
| Frankfurter, frankfurter.dev | Exchange rates: the European Central Bank's reference rates for the price feed, and the app's display currencies | Oracle and Price Feed, Become a Witness, Wallet Basics |
| Rates By Exchange Rate API, open.er-api.com | Exchange rates for the currencies the ECB does not publish, for the price feed | Oracle and Price Feed |
| Coinstore's public market data, api.coinstore.com | The PIXA/USDT order book the price feed reads, its trades and daily candles | Oracle and Price Feed |
| ipinfo.io | The country of a witness server's address, which the price feed looks up once at start-up | Oracle and Price Feed |
| CoinMarketCap: STEEM, SBD, snapshot of 2016-07-17 | Steem's market prices and rankings | From STEEM to HIVE to PIXA, From SBD to PXS |
| CoinGecko, Hive Dollar | HBD prices | From SBD to PXS |
| Moneyhouse | The Swiss commercial register entry of Pixagram SA | Who Does What |
npm: @pixagram/dpixa, @hiveio/dhive |
Library versions | SDKs and Libraries, Developer Quickstart |
Books and papers
| Work | Pages |
|---|---|
| W. Ross Ashby, An Introduction to Cybernetics (Chapman & Hall, 1956) | Variety and Regulation, Viable System Model |
| Stafford Beer, Brain of the Firm (Allen Lane, 1972; second edition, Wiley, 1981) and The Heart of Enterprise (Wiley, 1979) | Viable System Model, Variety and Regulation |
| C. S. Holling, "Resilience and Stability of Ecological Systems", Annual Review of Ecology and Systematics 4 (1973) | Resilience and Cascades |
| B. Walker, C. S. Holling, S. R. Carpenter and A. Kinzig, "Resilience, Adaptability and Transformability in Social–ecological Systems", Ecology and Society 9(2) (2004) | Resilience and Cascades, Glossary |
| P. Bak, C. Tang and K. Wiesenfeld, "Self-organized criticality: An explanation of the 1/f noise", Physical Review Letters 59 (1987) | Resilience and Cascades, Glossary |
| P. Bak and K. Chen, "Self-Organized Criticality", Scientific American 264(1) (1991) | Resilience and Cascades |
Articles and posts
Credits
Pixa is built on the work of others. The credits below are as each repository's licence file, or its README where noted, states them.
| Work | Credited to | Licence |
|---|---|---|
| Steem, the original code base | "Steemit, Inc., and contributors" | MIT |
| Hive, the code Pixa's node is forked from | "Hive blockchain community contributors" | MIT |
| Graphene, FC and Boost, which the node depends on | Their own authors, "under their own individual licenses" | Their own |
| Hivemind, the social layer | Steemit Inc. | MIT |
| dpixa's original code, from dhive | Johan Nordberg | BSD-3-Clause-No-Military-License |
| The Big Mac index | The Economist Newspaper | Software: MIT (LICENCE); data: CC BY 4.0 (README) |
Who wrote and changed each page is recorded in this repository's history.