Knowledge Base
Browse the concepts behind Truestamp. Follow the links between concepts, or search across everything.
Tagged: verification
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Entropy
Entropy Verification Levels
The two verification levels of a Truestamp entropy observation, internal hash and signature recomputation versus external re-checking against the original public source, how both apply when an observation rides in an item proof as a witness, and the clock delta between publication and capture.
Printing a Beacon as a Proof-of-Life Artifact
How to print a Truestamp beacon as a lectern sheet or a lanyard badge so a photograph or recording that shows it cannot have been made before the beacon existed, covering the three form factors, the QR code target, printer settings, and the limits of what the paper proves.
Public Entropy Beacons
The public /beacons page that exposes a finalized Truestamp block hash as verifiable public randomness, the beacon fields and chain-link, the derived fairness tools, and how to download and verify a beacon proof.
Time Page
The full-screen /time page, live Truestamp server time beside the latest entropy beacon, with a device clock delta, a sub-second subdial tuned to camera frame rates, a QR link, and an ambient rail streaming captured entropy into the next beacon, so a recording carries layered timing evidence.
Glossary
Chronolocation
The investigative practice of establishing when digital evidence such as a photo existed or was captured - Truestamp supports it by proving a submission window, giving evidence a verifiable existed-by guarantee while never claiming creation time.
CLI (truestamp)
The open-source truestamp command-line client, a single static binary for macOS, Linux, and Windows that submits items, downloads proof bundles, and verifies proofs fully offline without an account, signing in through the browser as a pre-registered OAuth 2.1 PKCE client.
Data integrity
The affirmative guarantee that the exact bytes submitted to Truestamp remain unchanged - any alteration changes the data's SHA-256 fingerprint and breaks the proof, so a verifier who re-hashes the data detects even a single changed byte; one of the three product pillars.
Offline verification
Checking a Truestamp proof bundle using only its own contents with no call to any Truestamp server, by recomputing domain-separated hashes, walking the Merkle inclusion and epoch proofs, and verifying the Ed25519 signature; on-chain confirmation is the only optional network step.
Proof bundle
The self-contained JSON or CBOR file downloaded for a committed subject, carrying the subject data and its metadata, Merkle proofs, an Ed25519 signature, the witness detail that opens the submitted-after edge, and at least one public-blockchain commitment, every hash recomputed from carried bytes.
Provenance
The third pillar of Truestamp's product framing - the traceable origin and history of data as a signed, publicly verifiable chain of evidence from submission through block inclusion to public-blockchain commitment, deliberately bounded to make no claim about who authored the content.
t type code
The frozen integer discriminator of a proof subject type, drawn from a registry namespaced by decade (10-19 block-like, 20-29 item, 30-39 entropy, 40-49 reserved for commitment chains); a bundle carries the matching registry name in its type key while the integer is what the signed payload binds.
Verification level
One of the two independent checks on an entropy observation - internal verification recomputes the stored hash and Ed25519 signature offline, external verification re-fetches the value from the original public source, and the merged summary adds the Merkle inclusion check.
Verification summary
The combined pass/fail report over every verification layer of an entropy observation (data hash, Ed25519 signature, Merkle inclusion, external source); it passes only when no individual check fails and marks the Merkle step skipped, not failed, until the observation is committed.
Witness
A public record that already existed when a subject was submitted and that the subject's composite fingerprint commits to, opening the submitted-after edge of the submission window; the registry is the head block plus one entry per captured entropy source, plus the signing-key event.
Integrations
In-App AI Chat Assistant
The Truestamp in-app AI chat assistant, a slide-out sidebar answering questions about Truestamp and your own data with a read-only toolset limited to what you may see, for signed-in users and (when enabled) anonymous guests, with starter questions seeded from item and public pages, feature-flagged.
Truestamp CLI
The open-source truestamp CLI, a single static binary for macOS, Linux, and Windows that creates, downloads, and verifies cryptographic proofs from the terminal, installs via curl, Homebrew, or Go, signs in with browser-based OAuth 2.1 PKCE, and verifies proofs fully offline.
Product
What Truestamp Does Not Prove
The honest limits of a Truestamp proof - it attests submission timing and data integrity but not creation time, not authorship or ownership, not the truthfulness of the content, and not that data existed before it was submitted.
What Truestamp Is
Plain-language overview of Truestamp, the data-integrity and timestamping service that turns submitted data into a portable cryptographic proof of the exact bytes and of a provable submission window, independently verifiable by anyone without trusting or contacting Truestamp.
What Truestamp Proves
The affirmative guarantees of a Truestamp proof, that the exact bytes existed unchanged and that submission fell inside a submission window whose earlier edge rests on witness records the proof carries and whose later edge is committed to a public blockchain, every hash re-derivable offline.
Verification
Proof Bundle Wire Format
The self-describing JSON and CBOR wire format of a Truestamp proof bundle, the named type registry, the subject with its claims, metadata and witnesses, block maps that carry their own metadata, the block path, external commitments, the signing key event, and why nothing opaque travels.
Proof Claims by Availability
Claims matrix for a Truestamp item proof, which of eight claims (bytes existed, unchanged, both submission-window edges, signature, key binding, ledger position, entropy freshness) hold from the bundle alone, from public chains and sources, from a pinned keyring, from the ledger, or never.
The Proof Lifecycle
How a Truestamp proof comes to exist and strengthens over time as an item is submitted against a set of witnesses, committed into a block via item commitment, and that block is committed to Stellar and Bitcoin via block commitment.
Verify a Proof
Step-by-step guide to verifying a Truestamp proof bundle offline by recomputing the leaf hash with domain separation, walking the Merkle inclusion path to the block root, rehashing each carried witness, and walking the epoch proof to the root recorded on Stellar or Bitcoin.