bitseal 0.3.0

Python SDK and offline verifier for the BitSeal cryptographic proof-of-existence service.

BitSeal Core SDK

The Digital Integrity Standard

Official Website: https://bitseal.orygn.tech/

---

Overview

BitSeal is a cryptographic proof-of-existence service. It creates tamper-evident, timestamped proofs for files using BLAKE3 Merkle trees and Ed25519 digital signatures.

This repository (BitSeal-SDK) is the reference implementation of the protocol. It contains the full cryptographic pipeline: chunking, BLAKE3 Merkle tree construction, Ed25519 signing, and both online and fully-offline verification. Every seal produced by the web service at bitseal.orygn.tech can be verified end-to-end against the code in this repository without trusting the web service itself. The unified manifest format (merkle-blake3-64k-v1) guarantees that a web seal and a CLI seal of the same bytes yield the same root hash.

Trust Code, Not Corporations.
Developed by Orygn LLC.

---

Features

• Ed25519 Signatures: High-performance, high-security Edwards-curve Digital Signature Algorithm.
• Dual-Hashing Architecture:
  • BLAKE3: Blindingly fast local client-side verification.
  • SHA3-512: NIST-standardized (FIPS 202) secondary whole-file digest for cryptographic redundancy.
• Merkle Tree Manifests: Tamper-evident data structures for seal logs.
• Client-side hashing: Files never leave the device during the sealing process. Only the manifest is transmitted.

---

Installation

pip install -r requirements.txt

Audit & Verification

This code serves as the reference implementation for the BitSeal protocol.

1. Verify a Seal (Reference Script)

You can run the included script to verify any seal root hash generated by the Evidence Sealer:

# Online: look up the seal on the public ledger and verify its signature
python verify.py --root <ROOT_HASH>

# Offline: verify a downloaded manifest.json with no network access
python verify.py --manifest path/to/manifest.json

Offline mode reconstructs the 40-byte signed message (root_bytes || little-endian f64 timestamp) and runs an Ed25519 verify against the Authority public key. Supply --public-key to pin a specific PEM; otherwise the current key is fetched once from the well-known endpoint.

2. Python Integration

Developers can import the core logic to build independent custom verifiers:

from BitSealCore import BitSealLedger

# Initialize the public ledger reader
ledger = BitSealLedger()

# Verify a seal hash
result = ledger.verify_seal("c868c3e09...")

if result['valid']:
    print(f"✅ Authenticated: {result['timestamp_utc']}")
else:
    print(f"❌ Invalid: {result['error']}")

---

Verification Logic

The core verification process (BitSealCore.py) performs the following checks:

1. Format Validation: Ensures the hash is a valid hex string of correct length.
2. Ledger Lookup: Query the public ledger for the existence of the seal.
3. Signature Verification: Cryptographically verify that the seal was signed by the BitSeal Authority Key (Ed25519 Public Key).
4. Integrity Check: Recompute the hash of the manifest to ensure no data has been altered.

---

Legal & Compliance

BitSeal logic is designed to meet standards for digital chain of custody. For full legal documentation and the technical whitepaper, visit the Documentation Portal.

---

License

This SDK is available under the MIT License. © 2026 Orygn LLC. All Rights Reserved.