{
  "id": 10310549,
  "title": "Eliminate replay attacks: Payload hashing & TTL validation in Fabric.",
  "url": "https://urgent.news/2026/09/27/eliminate-replay-attacks-payload-hashing-ttl-validation-in-fabric",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-09-27T23:09:28.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/william_rodriguez_65a5898/eliminate-replay-attacks-payload-hashing-ttl-validation-in-fabric-2ha1"
  },
  "original_language": "en",
  "account": "Replay attacks can lead to significant financial losses in financial and supply chain blockchains. To combat this threat, the wFabricSecurity Open-Source Engineering Series introduces a solution that employs payload hashing and Time-To-Live (TTL) validation.\n\nMalicious actors can intercept valid signed transactions and replay them hours later, causing chaos. Additionally, bit-flip corruption during network transmission often goes unnoticed by application layers, while zombie transactions linger in network buffers and execute out of order.\n\nThe wFabricSecurity library provides a simple yet effective way to eliminate these issues. To use it, first import the library and create a security object. Then, create a message with a 60-second TTL:\n\nmsg = security.create_message(recipient = CN=EndorsementPeer, content = {tx_type : transfer, amount : 5000}, ttl_seconds = 60)\n\nVerification checks for both hash integrity and timestamp expiration:\n\nis_valid = security.verify_message(msg)\n\nIf the 60 seconds have elapsed, it raises a MessageIntegrityError, indicating that the message has expired. This architecture ensures that messages are time-bound, payloads are hashed for integrity, and replay attacks are prevented. The library is tested and verified against Hyperledger Fabric environments and is compatible with Python 3.10+. For more information, visit the GitHub repository (https://github.com/wisrovi/wFabricSecurity) or the PyPI page (https://pypi.org/project/wFabricSecurity).",
  "summary": "Eliminate replay attacks: Payload hashing & TTL validation in Fabric. Day 06 of the wFabricSecurity Open-Source Engineering Series. In financial and supply chain blockchains, a transaction intercepted and replayed can cause millions in damages. wFabricSecurity envelopes feature automatic TTL and SHA-256 payload integrity. The Pain Points We Faced Malicious actors capturing valid signed…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}