₿ Proof of Merch Mining

Every piece we've shipped, on the record.

Every merch block is hash-chained. Every night, the fingerprint of the entire ledger is committed to the actual Bitcoin blockchain via OpenTimestamps. Anyone can verify their block independently. No trust required.

How to verify your block

1. Fetch your chain

curl https://twentyone-book-store.pages.dev/ledger/chains/merch_bitcoinaire_tee.json

Returns every mined block in that phrase's chain — timestamps, prices, hashes.

2. Independently verify the hash chain

python3 verify_block.py bitcoinaire 47

Walks the chain from genesis to your block, recomputing every SHA-256. If we ever altered a past record, every hash after it breaks.

↓ Download verify_block.py

3. Confirm the whole ledger is anchored to Bitcoin

ots verify manifest.json

Uses OpenTimestamps to prove the merkle root of the entire PoMM ledger was committed to a specific Bitcoin block. Not a promise. Math.

→ manifest.json · → manifest.json.ots

The 17 chains

One chain per phrase. Each capped at 2,100 pieces.

Ledger last snapshot: —

What this is (and isn't)

What it is

Append-only, tamper-evident audit log
SHA-256 hash chain (every block links to previous)
Merkle root of all chains anchored to Bitcoin daily via OpenTimestamps
Fully public JSON — anyone can download, audit, verify

What it isn't

Not a blockchain (single SQLite file on our server)
Not a distributed network
Not a token you can transfer or sell
Not proof-of-work — we mint, Bitcoin timestamp is the accountability layer

It's an audit log with cryptographic proof, anchored to Bitcoin. Like Git commits countersigned by the Bitcoin timechain.