Code shared from the Rust Playground

playground.rs

/*
 * ⛓️ THE UR-LANGUAGES OF CONSENSUS: A COMPARATIVE STUDY ⛓️
 * --------------------------------------------------------
 * This Rust Playground example serves as a functional reference for the 
 * "Sovereign Developer Stack" and BIP-64MOD context. It implements 
 * a mock "Consensus Engine" demonstrating how Bitcoin Script 
 * synthesized paradigms from Forth, MUMPS, APL, and COBOL.
 *
 * ARCHITECTURE: BIP-64MOD + GCC (Great Consensus Cleanup)
 * DATE: March 2026
 * --------------------------------------------------------
 */

#[derive(Debug, PartialEq)]
enum Opcode {
    /// FORTH: The LIFO Stack ancestor for arithmetic
    OpAdd,      
    /// COBOL: Financial precision and record auditability (No floats)
    OpEqual,    
    /// APL: High-level symbolic primitives for complex math
    OpCheckSig, 
}

/// The Consensus Engine simulates the "Global State" paradigm of MUMPS
struct ConsensusEngine {
    stack: Vec<i64>,     // LIFO Stack (The Forth Model)
    utxo_set: Vec<i64>,  // Global State (The MUMPS Model)
}

impl ConsensusEngine {
    fn new(initial_utxo: i64) -> Self {
        Self {
            stack: Vec::new(),
            // Representing a global state transition like MUMPS
            utxo_set: vec![initial_utxo], 
        }
    }

    fn push(&mut self, val: i64) {
        self.stack.push(val);
    }

    fn execute(&mut self, opcode: Opcode) {
        match opcode {
            // FORTH: Classic stack manipulation. Linear, no loops (GCC-compliant).
            Opcode::OpAdd => {
                let a = self.stack.pop().expect("Stack Underflow");
                let b = self.stack.pop().expect("Stack Underflow");
                self.stack.push(a + b);
            }
            // COBOL: Strict integer equality for financial certainty.
            Opcode::OpEqual => {
                let a = self.stack.pop().expect("Stack Underflow");
                let b = self.stack.pop().expect("Stack Underflow");
                self.stack.push(if a == b { 1 } else { 0 });
            }
            // APL: Abstracts massive cryptographic complexity into one symbolic call.
            Opcode::OpCheckSig => {
                println!(">>> APL-STYLE PRIMITIVE: Executing BIP-64MOD Signature Verification...");
                let result = if self.stack.last() == Some(&1) { 1 } else { 0 };
                self.stack.push(result);
            }
        }
    }
}

fn main() {
    // Initialize with a "Global State" value of 5 (MUMPS-style persistent record)
    let mut engine = ConsensusEngine::new(5);

    println!("--- BIP-64MOD / UR-LANGUAGE CONSENSUS SIMULATION ---");

    // 1. FORTH PHASE: Push operands to the LIFO stack
    engine.push(2);
    engine.push(3);
    println!("Stack (Initial Input): {:?}", engine.stack);

    // 2. FORTH EXECUTION: Consuming the stack
    engine.execute(Opcode::OpAdd);
    println!("Stack (Post-FORTH OP_ADD): {:?}", engine.stack);

    // 3. COBOL/MUMPS PHASE: Compare against the 'Global' UTXO state
    let target = engine.utxo_set[0];
    engine.push(target);
    println!("Pushing Global UTXO Target: {}", target);
    
    engine.execute(Opcode::OpEqual);
    println!("Stack (Post-COBOL OP_EQUAL): {:?}", engine.stack);

    // 4. APL PHASE: Final cryptographic 'witness' abstraction
    engine.execute(Opcode::OpCheckSig);

    // Final Validation
    let final_result = engine.stack.pop().unwrap_or(0);
    if final_result == 1 {
        println!("\n[RESULT]: SUCCESS. Transaction satisfies GCC and BIP-64MOD standards.");
    } else {
        println!("\n[RESULT]: FAILURE. Consensus rules violated.");
    }
}

/*
 * --- ARCHITECTURAL COMPLIANCE CHECK ---
 * * [FORTH]: engine.stack provides a deterministic, LIFO execution path.
 * [MUMPS]: engine.utxo_set treats the ledger as the primary language variable.
 * [APL]: OpCheckSig encapsulates ECDSA/Schnorr complexity in a single primitive.
 * [COBOL]: Logic uses i64 Satoshis exclusively—no floating-point drift.
 */