name

satbook - self-hosted Bitcoin passbook and India VDA tax engine

synopsis

context

Personal project

period

Aug 2026

stack

TypeScript, SvelteKit, Bun, SQLite, Drizzle

description

A single-user Bitcoin portfolio tracker that doubles as an India VDA tax engine. Every income, buy, sell, spend and self-transfer goes into one ledger, and holdings, break-even, unrealized P/L and Schedule VDA figures are recomputed from it on every read, so correcting or backfilling history just works.

highlights

• Computes tax the conservative way under s.115BBH: flat 30% plus cess, cost of acquisition only, losses ring-fenced, network fees neither taxed nor deducted.
• Derives the third value from any two of amount, rate and fiat value, and autofills the timestamp, amounts and fee from a pasted on-chain txid.
• Fetches the historical rate for backdated entries itself, converting through USD or EUR when that is the only quote available.

links

• source