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betKarma exchange

Letter of Guarantee verifier

Paste a betKarma exchange letter and check its Bitcoin-message signature against the published trust anchor. Runs entirely in your browser — we never see what you paste.

1 — paste the letter or upload the .txt

You can also drop the file you downloaded from the order page below. The full letter text including the BEGIN / END markers is required.

or upload a .txt file:

2 — verify

Trust anchor

The only Bitcoin address betKarma will ever use to sign exchange letters of guarantee:

bc1q6etkarmarvej0874ghw396eacejlsy5ygew5yk
Anchor file (append-only in this repo): exchange/signing-address.json

How it works

The letter is a standard Bitcoin Signed Message (BIP-137). You can verify it here, in any desktop wallet (Electrum, Sparrow, Bitcoin Core 25+), or with any online checker such as bitref.com or bitlist.co.

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