Documentation

Tectra Overview

Tectra is the open cryptographic authenticity layer for images and video. It gives every piece of digital content a verifiable origin - signed at the source, anchored on blockchain, and verifiable by anyone, anywhere, forever.

What is Tectra?

When an image is signed with Tectra, it receives four layers of unforgeable provenance:

Invisible Watermark

DWT+DCT steganography embeds a 128-bit cryptographic payload. Survives screenshots, compression, and re-encoding.

SHA-256 Hash

Exact cryptographic fingerprint. Any bit-level modification is immediately detected.

Perceptual Hash

Catches modified copies - crops, color adjustments, and social media re-encoding.

Blockchain Anchor

Merkle root anchored on Polygon. Immutable timestamp and chain of custody, independently verifiable.

Architecture

Signing Pipeline

Image / Video

Source file

SHA-256 + pHash

Hash & fingerprint

Ed25519 Sign

Cryptographic signature

Watermark Embed

Invisible 128-bit payload

Redis Batch Queue

Queued for anchoring

Merkle Tree Build

Batch of thousands of records

Polygon Blockchain

Immutable on-chain anchor

Verification Pipeline

Watermark ExtractInvisible payload match

SHA-256 HashExact file fingerprint

Perceptual HashModified copy detection

Blockchain LookupOn-chain proof verify

Confidence Score returned (0–100%)

System Architecture

Clients

Next.js Dashboard

Python SDK

TypeScript SDK

Docker Agent

FastAPI Backend

/api/v1/sign

/api/v1/verify

/api/v1/auth

/api/v1/keys

/api/v1/dashboard

Data & Infrastructure

PostgreSQL

Polygon Blockchain

Redis + Celery

Explore the docs

Quickstart

Sign your first image in under 5 minutes.

How It Works

Deep-dive into watermarking, hashing, blockchain anchoring, and C2PA.

Use Cases

AI companies, cameras, artists, news orgs, medical imaging.

API Reference

All REST endpoints with curl examples and response schemas.

Python SDK

Local signing, video support, directory watcher.

Docker Agent

Zero-code drop-in for camera and media pipelines.

Blockchain

Smart contract ABI, Merkle proofs, independent verification.

Verification Guide

Confidence scores, the 4 checks, and what Authentic means.

TypeScript SDK

Official SDK for JavaScript and TypeScript. Sign, verify, and manage records from Node.js or the browser.

Browser Extension

Chrome extension for right-click image verification. No account needed.

Open Source

MIT-licensed verification library. Extract watermarks, compute hashes, verify proofs.

Webhooks

Real-time event notifications for content signing and blockchain anchoring.

Open Standard

Tectra implements the C2PA Content Credentials standard, backed by Adobe, Microsoft, Google, the BBC, and others. Tectra is a C2PA member. All blockchain records are on Polygon and independently verifiable.