Timestamp anything on Bitcoin with OpenTimestamps: send text, a SHA-256 hash or a URL and get a standard .ots proof (base64). Only a salted hash leaves our server. The public calendars anchor it in a Bitcoin block within hours; then btc-timestamp-verify returns the block and the complete proof, which anyone can check with the open-source ots tool. For contracts, AI outputs, datasets, invoices and web evidence.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.005000 USDC | 0x622e...4F27 |
| solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp | exact | 0.01 tokens | 5JzPS5...77tg |
| Polygon | exact | $0.005000 USDC | 0x622e...4F27 |
| Arbitrum One | exact | $0.005000 USDC | 0x622e...4F27 |