Petoron Seal Contracts (PSC)

PSC is an irreversible, binary, offline system of digital agreements without code execution.
Each contract is a fixed cryptographic promise, signed by the participants and time limited (TTL).
PSC does not require a blockchain, API or internet. It works like a seal: once and. forever.

Key features

• Binary format only (no JSON, YAML or text declarations)
• TTL (time to live) is embedded in the file
• Participant signatures (Ed25519)
• executed - flag protects against reuse
• Signatures are external (.sig), not embedded.
• Support for manual deletion (burn)
• Full compatibility with PTBC (ability to encrypt PSC)

CLI commands :))

Generate keys:
python3 cli/psc_cli.py genkey --output userA

Create contract:
python3 cli/psc_cli.py create contract.txt --pubkeys userA.pub --ttl 3600 --output contract.psc

Sign:
python3 cli/psc_cli.py sign contract.psc --private userA.priv --output userA.sig

Verify signature:
python3 cli/psc_cli.py verify contract.psc --sig userA.sig --public userA.pub

Verify all signatures:
python3 cli/psc_cli.py verify-all contract.psc --sigs userA.sig --pubs userA.pub

Check status:
python3 cli/psc_cli.py status contract.psc

Execute contract:
python3 cli/psc_cli.py execute contract.psc --sigs userA.sig --pubs userA.pub

Delete contract:
python3 cli/psc_cli.py burn contract.psc

*PSC can be encrypted with the Petoron Time Burn Cipher for complete privacy:
python3 python3 ptbc_cli.py encrypt contract.psc contract.ptbc --ttl 600

Dependencies:
Python 3.7+
PyNaCl (pip install pynacl)

That's kind of it, I give it to you :))