Proof of existence: anchor the SHA-256 of any text, file or URL in the Bitcoin blockchain through OpenTimestamps calendars and get the .ots proof file, so anyone can later verify the data existed at that time. Also callable as GET with the same fields as query parameters.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.01 USDC | 0xD2bc...1AA2 |
| Base | exact | 0.01 tokens | 0xD2bc...1AA2 |
| Polygon | exact | $0.01 USDC | 0xD2bc...1AA2 |
| Arbitrum One | exact | $0.01 USDC | 0xD2bc...1AA2 |
| eip155:480 | exact | 0.01 tokens | 0xD2bc...1AA2 |