2.1 Password-Based Authentication
What PTERI replaces — and why it is no longer needed
2.2 OTP, SMS, and Authenticator Apps
When cryptographic intent is signed directly, time-based codes and shared secrets become unnecessary.
2.3 Static API Keys & Service Secrets
When authority is cryptographic and scoped, static API keys become obsolete.
2.4 Custodial Payment Systems
When identity and payment authorization are cryptographically unified, intermediaries become unnecessary.
2.5 Smart-Contract–Centric Web3 Stacks
When cryptographic authority is the foundation, tokens and complex on-chain logic become unnecessary.
2.6 “Zero Trust” (Policy-Heavy) Systems
What PTERI Replaces — Identity & Policy Engines