This is the codebase behind the bitcoin-supply.com website. It shows how the supply calculations are reached and serves as a platform for proposals and debate about changes to these calculations. Primarily, this site tracks provably lost coin although likely lost and other classifications are possible.

Coin can be provably lost by users issuing transactions which require an impossible condition for re-spend. (akin to requiring 1 + 1 = 3 before a coin can be spent again) Coins can also be provably lost by miners not accepting the expected new supply in a block (not accepting the block reward) or by not collecting the existing coins which are available to the miners as fees for the transactions in a block.

Coin classified as likely lost, as its name would imply, is a more subjective label. This include coins that are likely unspendable due to the loss of private keys. While this type of loss can never be proven, it is still a useful estimation. (not currently shown)

Additions and changes to what constitutes provably lost, likely lost and other classifications of the supply are done in the proposals/ tree. Submit a PR with your proposal file in markdown format and discussion will happen in comments related to the PR. Once proposals reach finality, they get implemented in the detectors/ and become part of the production environment.

There are three significant parts of this codebase:

• Proposals and the logic which implements them
• A backend script that uses a bitcoin full node to keep the database up to date
• A website which exposes the data in the database

The following instructions will get the backend and web projects up and running on your system.

• git
• (optional) git-lfs
• Node.js
• PostgreSQL
• Indexed Bitcoin Full Node (with RPC configured and the -txindex flag)
• bitcoin-etl (python based - pip install bitcoin-etl)

Clone the repo:

git clone https://github.com/anders94/bitcoin-supply.com.git
cd bitcoin-supply.com/

Optionally, pull the large SQL files used in backfill: (these are stored in LFS because they are hundreds of megabytes)

git lfs pull

Install modules:

cd bitcoin-supply.com/
npm install

Optionally, globally install db-migrate so the tool is available at a default path in your shell.

npm install -g db-migrate

Set up a user and a few databases in your PostgreSQL setup:

CREATE USER bitcoin-supply WITH PASSWORD '<change me>';
CREATE DATABASE "bitcoin-supply_dev" OWNER "bitcoin-supply";
CREATE DATABASE "bitcoin-supply_test" OWNER "bitcoin-supply";
CREATE DATABASE "bitcoin-supply_prod" OWNER "bitcoin-supply";

Adjust database.json specifying your PostgreSQL host, port, username and databases.

Run all the database migrations:

db-migrate up

Optionally, to step backwards taking the migrations down migration by migration, use:

db-migrate down

A quick peek at config/index.js reveales a set of defaults and environment variables.

Both the webserver and the backend rely on the same environment variables so sourcing a file or using a tool like chpst is convenient. env/ is in .gitignore.

Start the backend process which updates the database as new blocks come in.

node backend-etl

Starting from a blank database will take at least a month to catch up to current as the backend steps through each block one by one running the loss detection logic. Using the backfill mentioned above significantly reduces this overhead.

Then, start the webserver:

node bin/www

Point your web browser at http://localhost:3000 to see the frontend.

• Anders Brownworth - Initial work - anders94

This project is under the MIT License.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.