PrometheanLink is an open standard for creating cryptographically signed, verifiable commitments between any two parties. No blockchain required.
A world where every digital commitment is mathematically verifiable, tamper-proof, and independent of any central authority.
Every commitment is signed with Ed25519 keys. The signature IS the proof. No trust required, no authority needed, no faith in institutions.
Instances connect peer-to-peer. No central server. No single point of failure. Your data stays on your infrastructure.
Anyone can implement the protocol. Interoperability is guaranteed. The specification is public and will remain so.
No blockchain overhead. No consensus mechanisms. No mining. Just signatures and hashes. Fast, efficient, practical.
Each packet references the previous. Tampering breaks the chain. History is immutable and auditable.
Dual signatures required. Both parties sign the same hash at the same moment. Neither can forge or deny.
A simple flow: Create, Sign, Send, Verify. That's it.
Creates packet
Signs with private key
Payload + Hash
+ Signature + Chain
Verifies signature
Checks chain integrity
Every PrometheanLink packet contains the same core fields, ensuring interoperability across all implementations.
{
"protocol": "promethean-link",
"version": "0.1.0",
"packet_id": "pkt-7f3a9b2c-001",
"packet_type": "COMMITMENT",
"timestamp": "2026-01-25T12:00:00Z",
"sender_instance": "https://a.example.com",
"recipient_instance": "https://b.example.com",
"payload": {
"type": "service_agreement",
"terms": "...",
"value": 50000,
"currency": "USD"
},
"payload_hash": "a7f3b2c1...",
"prev_hash": "9d8e7f6a...",
"signature": "Ed25519(...)"
}
The cryptographic primitives that make it work.
EdDSA over Curve25519
For payload and chain hashing
32-byte public keys
Compact and efficient
For keys and signatures
TLS 1.3 recommended
PrometheanLink works anywhere commitments need to be verifiable.
Sign service agreements, NDAs, or any legal document. Both parties sign the same hash. Proof of agreement forever.
Cross-organization chat where every message is signed. Know exactly who said what, with cryptographic proof.
Track goods across organizations. Each handoff is signed. Verify the entire chain of custody.
Record payment promises, invoices, or transfers. Immutable audit trail for every transaction.
Issue verifiable credentials. Diplomas, certifications, licenses. Anyone can verify without calling the issuer.
Board resolutions, shareholder votes, DAO governance. Every vote is signed and auditable.
How it compares to other approaches.
Every PrometheanLink-compliant instance exposes these endpoints.
# Discovery GET /.well-known/promethean-link.json Returns instance identity and public key # Federation POST /api/federation/handshake Exchange keys with another instance # Messaging POST /api/federation/receive Receive signed packets from federated instances # Verification GET /api/verify/{packet_id} Verify a packet's signature and chain
PrometheanLink is open source. Implement it in your application, or try SMARTiDATA for a complete solution.