https://orphograph.com/blog/ Notes from the office. Method, doctrine, and edge cases of Bitcoin-anchored timestamps. en-us © 2026 Orphograph hello@orphograph.com (Orphograph) Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/date-stamp-a-document-permanently.html https://orphograph.com/blog/date-stamp-a-document-permanently.html A plain-English guide to placing a permanent, third-party-verifiable date on a digital document — using a cryptographic fingerprint anchored to the Bitcoin chain, with no expiry and no trusted intermediary. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-a-contract-existed-before-a-date.html https://orphograph.com/blog/prove-a-contract-existed-before-a-date.html A plain-English method for proving that a signed or unsigned contract existed in its present form before a specific calendar date. Anchor the document's cryptographic fingerprint to the Bitcoin chain and hold a third-party-verifiable date of record. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-a-photo-was-not-edited.html https://orphograph.com/blog/prove-a-photo-was-not-edited.html A plain-English guide to proving a photograph has not been edited since a specific moment, using a cryptographic fingerprint anchored to the Bitcoin chain. Verifiable by anyone, with no trusted intermediary. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-code-existed-before-a-competitors-commit.html https://orphograph.com/blog/prove-code-existed-before-a-competitors-commit.html A practical guide for engineers and engineering organisations: anchor a source tree's cryptographic fingerprint to the Bitcoin chain so a defensible date of record fixes the bytes before any competing commit. From the Orphograph office. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-i-created-something-before-someone-else.html https://orphograph.com/blog/prove-i-created-something-before-someone-else.html A plain-English method for establishing priority of creation — proving a draft, sketch, manuscript, or design existed in your hands before someone else's competing claim. Bitcoin-anchored, third-party-verifiable, permanent. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-you-wrote-it-not-ai.html https://orphograph.com/blog/prove-you-wrote-it-not-ai.html A practical guide for writers, students, and journalists accused of using AI to produce text. Save the file, anchor its fingerprint to the Bitcoin chain, hold a verifiable date of record that pre-dates the accusation. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/what-makes-a-digital-timestamp-legally-defensible.html https://orphograph.com/blog/what-makes-a-digital-timestamp-legally-defensible.html An institutional explainer of the properties that make a digital timestamp hold up under examination — independent verification, cryptographic binding, public anchoring, and continuity beyond the issuer. From the Orphograph office. Thu, 21 May 2026 00:00:00 +0000 https://orphograph.com/blog/bitcoin-block-height-as-source-of-truth.html https://orphograph.com/blog/bitcoin-block-height-as-source-of-truth.html Why a Bitcoin block height is the strongest existence-proof anchor in 2026. Sixteen-year track record, attack costs, what would have to fail. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/bitcoin-merkle-roots-unforgeable-timestamps.html https://orphograph.com/blog/bitcoin-merkle-roots-unforgeable-timestamps.html A technical walkthrough of why a timestamp anchored to Bitcoin is fundamentally different from a conventional database record. The math, the eight attacks an adversary would have to mount, and why each one fails in practice. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/digital-notary-vs-cryptographic-timestamp.html https://orphograph.com/blog/digital-notary-vs-cryptographic-timestamp.html Digital notary vs cryptographic timestamp — what each actually proves, why they are not interchangeable, and which one your use case needs. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/how-to-prove-photo-existed-before-ai-model-released.html https://orphograph.com/blog/how-to-prove-photo-existed-before-ai-model-released.html Step-by-step walkthrough to prove a photo existed before AI training. Bitcoin-anchored timestamp, free tier, ten-minute setup. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/opentimestamps-for-non-developers.html https://orphograph.com/blog/opentimestamps-for-non-developers.html A practical explainer of what OpenTimestamps is, why it works, and how to use it without opening a terminal. Bitcoin-anchored proof of existence, with no per-record cost. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/prove-photo-existed-before-ai.html https://orphograph.com/blog/prove-photo-existed-before-ai.html A practical guide for photographers who want timestamp-grade proof of when they made an image. Bitcoin-anchored timestamps, free tier, ten-second workflow. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/reading-ots-file-by-hand.html https://orphograph.com/blog/reading-ots-file-by-hand.html A byte-by-byte walkthrough of what is actually inside an OpenTimestamps proof file. For investigators, journalists verifying a tip, and anyone who wants to confirm the math is real. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/why-5-opentimestamps-calendars-not-1.html https://orphograph.com/blog/why-5-opentimestamps-calendars-not-1.html Why submitting to five OpenTimestamps calendars instead of one matters — independent operators, no single point of failure, receipt survives outages. Sun, 17 May 2026 00:00:00 +0000 https://orphograph.com/blog/why-domain-dying-doesnt-kill-your-timestamp.html https://orphograph.com/blog/why-domain-dying-doesnt-kill-your-timestamp.html Most SaaS receipts are worthless when the company disappears. A Bitcoin-anchored timestamp is structurally different — the proof outlives the issuer by design. Sun, 17 May 2026 00:00:00 +0000