12.4 Custodial Payment Systems

When identity and payment authorization are cryptographically unified, intermediaries become unnecessary.


Legacy Custodial Model vs PTERI

Category
Traditional Model
Problems
PTERI Replacement

Fund Control

Funds held by intermediaries

Custody risk

Self-custody

Fraud Handling

Fraud detection after the fact

Reversibility assumptions

Signed payment intent

Dispute Model

Dispute-based resolution

Operational overhead

Deterministic settlement

Automation

Manual review and approval layers

Limited automation

Native machine execution

Settlement

Platform-mediated clearing

Global settlement friction

UTXO-based settlement on Litecoin

Identity Link

Identity separate from payment authorization

Weak attribution

Identity and payment provably linked


Core Principle

"Identity and payment authorization are provably linked."

When payment intent is signed, custody, reversal logic, and intermediary trust are no longer required.


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