Chain Notes — Companion static

The online half of the offline notes app: builds sync bundles from the blockchain for the device to import, and broadcasts the transactions the device signs. No keys ever touch this page.

Network

1 · Build a sync bundle

Notes address (from the device's home screen) Spending wallet addresses (optional — paste from the device's Settings → "Separate spending wallet" card, one per line)

2 · Broadcast signed transactions

Drop the .hex file(s) the device exported to /chain-notes/outbox, or paste raw hex.

…or paste raw transaction hex

Endpoints: mempool.space (mainnet/testnet4/signet) or the local regtest shim. Bundles contain only public chain data; transactions you broadcast are already signed and final.

Experimental software, provided “as is” without warranty of any kind — use at your own risk. The authors accept no liability for any loss of funds or data. Notes are public, permanent records on the bitcoin blockchain and cannot be deleted. Nothing here is financial advice.