Proxae

Proxae creates cryptographic evidence that a document, idea, or other file existed at a particular time. You drop in a file, enter text, or, when using an account, capture a web page. Proxae calculates a SHA-256 fingerprint locally in the browser, so the source content stays on your device and only the fingerprint is transmitted. That fingerprint is submitted through OpenTimestamps and anchored in the Bitcoin blockchain. After confirmation, the service provides a proof link and an OTS file containing the verification path. To check a proof, you provide the original file; Proxae recomputes its fingerprint and compares it with the anchored record. Proofs can also be checked through OpenTimestamps or its command-line tools, supporting verification independent of Proxae. The free offering covers text and file certification, unlimited proofs, and shareable proof links without an account. Pro adds RFC 3161 timestamping, an eIDAS-qualified certificate, an official PDF certificate, folders, exports, and optional identity verification. Proxae is intended for authors, designers, researchers, entrepreneurs, developers, and other professionals who need dated evidence of prior existence for ideas, drafts, correspondence, or creative work. It proves a date; it does not grant exclusive rights or replace legal advice.