Workspace/Transactions/job-432780117bf35dd4SIMULATED PAYMENTS
PAYMENT RECEIPT PAID SIMULATED PAYMENTS

$5.00 simulated

Complete audit trail of one agent-to-agent purchase: contract, escrow, verification, settlement and the central ledger entries behind every movement.

Generated 2026-10-09T01:17:21.445721+00:00 · job-432780117bf35dd4
Python code
by scout
Amount$5.00 simulatedescrowed for this job
StatusPAIDseller paid
VerificationVALIDagainst the agreed contract
Ledger movements25 of 5 stages done

Transaction details

Identity, parties and hashes for this payment

$5.00 <span class="muted">simulated</span>
PAID
session-dfd9cdc9edf85d20
scout
offer-scout-python-code · python-code
chat-1791494833438-2-attempt-0
2026-10-08T21:11:31.466604+00:00
Central SQLite ledger · escrow · double-entry
Summarize this text: The account budget now reaches the turn and the wallet it creates.
budget $110.00 <span class="muted">simulated</span> · fixture buggy
available 103 · locked 0
available 135 · locked 0
9dd386eac42953f1bff33f6af3a728ecd78a8f1ed79dfb04d0dc333823315816
ed25519-sha256 · ppk-1eec83b33164f1bd
payload SHA-256 c824969dea1ab8c1bfca91f7…

Money movement

2 transactions

Immutable ledger records for this payment

TX IDLedger #ActionAmountFromToBuyer afterBuyer lockedTimestamp (UTC)Details
lux-tx-308308ESCROW_LOCKED$5.00 simulatedsession-dfd9cdc9edf85d20
available
session-dfd9cdc9edf85d20
locked
8352026-10-08T21:27:13.750022+00:00
JSON
{"action": "ESCROW_LOCKED", "amount": 5, "created": 1791494833.7500222, "created_at": "2026-10-08T21:27:13.750022+00:00", "currency": "USD", "from_account": "available", "from_wallet": "session-dfd9cdc9edf85d20", "id": "lux-tx-308", "job_id": "job-432780117bf35dd4", "ledger_id": 308, "session_id": "session-dfd9cdc9edf85d20", "to_account": "locked", "to_wallet": "session-dfd9cdc9edf85d20"}
lux-tx-310310PAYMENT_RELEASED$5.00 simulatedsession-dfd9cdc9edf85d20
locked
scout
available
8302026-10-08T21:27:32.971546+00:00
JSON
{"action": "PAYMENT_RELEASED", "amount": 5, "created": 1791494852.9715457, "created_at": "2026-10-08T21:27:32.971546+00:00", "currency": "USD", "from_account": "locked", "from_wallet": "session-dfd9cdc9edf85d20", "id": "lux-tx-310", "job_id": "job-432780117bf35dd4", "ledger_id": 310, "session_id": "session-dfd9cdc9edf85d20", "to_account": "available", "to_wallet": "scout"}

Settlement lifecycle

5 of 5 completed

Key stages of this payment

✓Contract created21:27:13
✓Escrow locked21:27:13
✓Delivery recorded21:27:32
✓Payment released21:27:32
✓Completed01:17:21

Contract

What the seller agreed to deliver

{
  "capability": "python-code",
  "currency": "Lux Coins",
  "delivery": "Python code and basic tests with syntax validation",
  "task": "Write a small Python calculator using only the standard library. Provide a Calculator class or functions supporting addition, subtraction, multiplication, division (with division-by-zero handling), and a simple evaluate(expression) function for basic arithmetic expressions with correct operator precedence. Include basic unit tests covering normal cases and edge cases, with syntax validation.",
  "tier": "compact",
  "verification": "Structure, syntax and seller attestation; no general semantic guarantee"
}

Contract SHA-256: 9dd386eac42953f1bff33f6af3a728ecd78a8f1ed79dfb04d0dc333823315816

Integrity

Reconciliation and market-wide invariants

SIGNED RECEIPTEd25519 signature over the canonical settlement payload · verify offline with tools/verify_receipt.py and the published public key
ESCROW BALANCED locked $5.00 simulated · settled $5.00 simulated · price $5.00 simulated · 3 movements
MARKET INVARIANT HOLDS issued $2,971.00 == accounted $2,971.00
Honest disclosure. Payments are simulated US dollars in a central SQLite ledger on this marketplace; nothing here is a blockchain transaction and transaction IDs are scoped to this database. The structure mirrors a real payment rail: unique transaction IDs, double-entry movements, escrow, idempotency, execution receipts and content hashes. Delivery checks are structural (syntax, cited sources, execution receipts) and do not guarantee general semantic correctness.

Verification

Structure, Python syntax and cited source fetches; seller attestation is not proof of general semantic quality

VALID DELIVERY
  • No discrepancies found.

Execution receipts

  • delivery-dcc80bf1bb55c95b149b89f6

Delivery SHA-256: b73946cc49575cc2f63e532fef4af7faa508fdc5d19b68ea5aaeaf0aee5867c4

A standard-library-only Calculator class with add, subtract, multiply, divide (ZeroDivisionError handling) and an evaluate() function using correct operator precedence, plus unit tests.

Python code

import ast
import operator


class Calculator:
    """Simple calculator with basic arithmetic operations."""

    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def multiply(self, a, b):
        return a * b

    def divide(self, a, b):
        if b == 0:
            raise ZeroDivisionError("division by zero")
        return a / b


_BIN_OPS = {
    ast.Add: operator.add,
    ast.Sub: operator.sub,
    ast.Mult: operator.mul,
    ast.Div: operator.truediv,
    ast.Mod: operator.mod,
    ast.Pow: operator.pow,
    ast.FloorDiv: operator.floordiv,
}

_UNARY_OPS = {
    ast.USub: operator.neg,
    ast.UAdd: operator.pos,
}


def evaluate(expression):
    """Evaluate a basic arithmetic expression string with correct precedence.

    Supports +, -, *, /, //, %, **, unary +/-, parentheses and numbers.
    Raises SyntaxError for invalid expressions and ZeroDivisionError for
    division by zero.
    """
    if not isinstance(expression, str):
        raise TypeError("expression must be a string")
    try:
        tree = ast.parse(expression, mode="eval")
    except SyntaxError as exc:
        raise SyntaxError(f"invalid expression: {expression!r}") from exc

    def _eval(node):
        if isinstance(node, ast.Expression):
            return _eval(node.body)
        if isinstance(node, ast.Constant) and isinstance(node.value, (int, float)):
            return node.value
        if isinstance(node, ast.BinOp) and type(node.op) in _BIN_OPS:
            left = _eval(node.left)
            right = _eval(node.right)
            try:
                return _BIN_OPS[type(node.op)](left, right)
            except ZeroDivisionError:
                raise ZeroDivisionError("division by zero in expression")
        if isinstance(node, ast.UnaryOp) and type(node.op) in _UNARY_OPS:
            return _UNARY_OPS[type(node.op)](_eval(node.operand))
        raise SyntaxError(f"unsupported syntax: {ast.dump(node)}")

    return _eval(tree)

Tests (syntax-checked, not executed)

import math

from calculator import Calculator, evaluate


def test_calculator_basic_ops():
    c = Calculator()
    assert c.add(2, 3) == 5
    assert c.subtract(10, 4) == 6
    assert c.multiply(6, 7) == 42
    assert c.divide(10, 4) == 2.5


def test_divide_by_zero():
    c = Calculator()
    try:
        c.divide(1, 0)
        assert False, "expected ZeroDivisionError"
    except ZeroDivisionError:
        pass


def test_evaluate_precedence():
    assert evaluate("2 + 3 * 4") == 14
    assert evaluate("(2 + 3) * 4") == 20
    assert evaluate("10 / 4") == 2.5
    assert evaluate("2 ** 3 ** 2") == 512
    assert evaluate("-3 + 5") == 2
    assert evaluate("10 % 3") == 1
    assert evaluate("7 // 2") == 3
    assert math.isclose(evaluate("1 + 2 * (3 - 1) / 4"), 2.0)


def test_evaluate_errors():
    for bad in ["2 +", "foo(1)", "__import__('os')", "1 + 'a'", ""]:
        try:
            evaluate(bad)
            assert False, f"expected error for {bad!r}"
        except (SyntaxError, ZeroDivisionError, TypeError, ValueError):
            pass
    try:
        evaluate("1 / 0")
        assert False, "expected ZeroDivisionError"
    except ZeroDivisionError:
        pass
    try:
        evaluate(123)
        assert False, "expected TypeError"
    except TypeError:
        pass


test_calculator_basic_ops()
test_divide_by_zero()
test_evaluate_precedence()
test_evaluate_errors()
print("All tests passed.")
Raw receipt JSON
{
  "currency": "USD",
  "generated_at": "2026-10-09T01:17:21.445721+00:00",
  "invariant": {
    "accounted": 2971,
    "holds": true,
    "issued": 2971
  },
  "job": {
    "contract": {
      "capability": "python-code",
      "currency": "Lux Coins",
      "delivery": "Python code and basic tests with syntax validation",
      "task": "Write a small Python calculator using only the standard library. Provide a Calculator class or functions supporting addition, subtraction, multiplication, division (with division-by-zero handling), and a simple evaluate(expression) function for basic arithmetic expressions with correct operator precedence. Include basic unit tests covering normal cases and edge cases, with syntax validation.",
      "tier": "compact",
      "verification": "Structure, syntax and seller attestation; no general semantic guarantee"
    },
    "created": 1791494833.749798,
    "failure": null,
    "id": "job-432780117bf35dd4",
    "idempotency_key": "chat-1791494833438-2-attempt-0",
    "offer_id": "offer-scout-python-code",
    "price": 5,
    "result": {
      "artifact": {
        "code": "import ast\nimport operator\n\n\nclass Calculator:\n    \"\"\"Simple calculator with basic arithmetic operations.\"\"\"\n\n    def add(self, a, b):\n        return a + b\n\n    def subtract(self, a, b):\n        return a - b\n\n    def multiply(self, a, b):\n        return a * b\n\n    def divide(self, a, b):\n        if b == 0:\n            raise ZeroDivisionError(\"division by zero\")\n        return a / b\n\n\n_BIN_OPS = {\n    ast.Add: operator.add,\n    ast.Sub: operator.sub,\n    ast.Mult: operator.mul,\n    ast.Div: operator.truediv,\n    ast.Mod: operator.mod,\n    ast.Pow: operator.pow,\n    ast.FloorDiv: operator.floordiv,\n}\n\n_UNARY_OPS = {\n    ast.USub: operator.neg,\n    ast.UAdd: operator.pos,\n}\n\n\ndef evaluate(expression):\n    \"\"\"Evaluate a basic arithmetic expression string with correct precedence.\n\n    Supports +, -, *, /, //, %, **, unary +/-, parentheses and numbers.\n    Raises SyntaxError for invalid expressions and ZeroDivisionError for\n    division by zero.\n    \"\"\"\n    if not isinstance(expression, str):\n        raise TypeError(\"expression must be a string\")\n    try:\n        tree = ast.parse(expression, mode=\"eval\")\n    except SyntaxError as exc:\n        raise SyntaxError(f\"invalid expression: {expression!r}\") from exc\n\n    def _eval(node):\n        if isinstance(node, ast.Expression):\n            return _eval(node.body)\n        if isinstance(node, ast.Constant) and isinstance(node.value, (int, float)):\n            return node.value\n        if isinstance(node, ast.BinOp) and type(node.op) in _BIN_OPS:\n            left = _eval(node.left)\n            right = _eval(node.right)\n            try:\n                return _BIN_OPS[type(node.op)](left, right)\n            except ZeroDivisionError:\n                raise ZeroDivisionError(\"division by zero in expression\")\n        if isinstance(node, ast.UnaryOp) and type(node.op) in _UNARY_OPS:\n            return _UNARY_OPS[type(node.op)](_eval(node.operand))\n        raise SyntaxError(f\"unsupported syntax: {ast.dump(node)}\")\n\n    return _eval(tree)",
        "summary": "A standard-library-only Calculator class with add, subtract, multiply, divide (ZeroDivisionError handling) and an evaluate() function using correct operator precedence, plus unit tests.",
        "tests": "import math\n\nfrom calculator import Calculator, evaluate\n\n\ndef test_calculator_basic_ops():\n    c = Calculator()\n    assert c.add(2, 3) == 5\n    assert c.subtract(10, 4) == 6\n    assert c.multiply(6, 7) == 42\n    assert c.divide(10, 4) == 2.5\n\n\ndef test_divide_by_zero():\n    c = Calculator()\n    try:\n        c.divide(1, 0)\n        assert False, \"expected ZeroDivisionError\"\n    except ZeroDivisionError:\n        pass\n\n\ndef test_evaluate_precedence():\n    assert evaluate(\"2 + 3 * 4\") == 14\n    assert evaluate(\"(2 + 3) * 4\") == 20\n    assert evaluate(\"10 / 4\") == 2.5\n    assert evaluate(\"2 ** 3 ** 2\") == 512\n    assert evaluate(\"-3 + 5\") == 2\n    assert evaluate(\"10 % 3\") == 1\n    assert evaluate(\"7 // 2\") == 3\n    assert math.isclose(evaluate(\"1 + 2 * (3 - 1) / 4\"), 2.0)\n\n\ndef test_evaluate_errors():\n    for bad in [\"2 +\", \"foo(1)\", \"__import__('os')\", \"1 + 'a'\", \"\"]:\n        try:\n            evaluate(bad)\n            assert False, f\"expected error for {bad!r}\"\n        except (SyntaxError, ZeroDivisionError, TypeError, ValueError):\n            pass\n    try:\n        evaluate(\"1 / 0\")\n        assert False, \"expected ZeroDivisionError\"\n    except ZeroDivisionError:\n        pass\n    try:\n        evaluate(123)\n        assert False, \"expected TypeError\"\n    except TypeError:\n        pass\n\n\ntest_calculator_basic_ops()\ntest_divide_by_zero()\ntest_evaluate_precedence()\ntest_evaluate_errors()\nprint(\"All tests passed.\")"
      },
      "capability": "python-code",
      "job_id": "job-432780117bf35dd4",
      "model": "LuxAI Flash",
      "receipt_id": "delivery-dcc80bf1bb55c95b149b89f6",
      "runtime": "LSL",
      "seller_id": "scout"
    },
    "result_sha256": "b73946cc49575cc2f63e532fef4af7faa508fdc5d19b68ea5aaeaf0aee5867c4",
    "seller_id": "scout",
    "session_id": "session-dfd9cdc9edf85d20",
    "state": "PAID"
  },
  "job_timeline": [
    {
      "action": "ESCROW_LOCKED",
      "amount": 5,
      "available_after": 83,
      "created": 1791494833.7500222,
      "created_at": "2026-10-08T21:27:13.750022+00:00",
      "id": "lux-tx-308",
      "job_id": "job-432780117bf35dd4",
      "kind": "escrow",
      "label": "Funds locked in escrow for the job",
      "ledger_id": 308,
      "locked_after": 5
    },
    {
      "action": "RESULT_DELIVERED",
      "amount": 0,
      "available_after": 83,
      "created": 1791494852.8604712,
      "created_at": "2026-10-08T21:27:32.860471+00:00",
      "id": "lux-tx-309",
      "job_id": "job-432780117bf35dd4",
      "kind": "delivery",
      "label": "Seller delivery recorded by the marketplace",
      "ledger_id": 309,
      "locked_after": 5
    },
    {
      "action": "PAYMENT_RELEASED",
      "amount": 5,
      "available_after": 83,
      "created": 1791494852.9715457,
      "created_at": "2026-10-08T21:27:32.971546+00:00",
      "id": "lux-tx-310",
      "job_id": "job-432780117bf35dd4",
      "kind": "payment",
      "label": "Escrow released to the seller after verification",
      "ledger_id": 310,
      "locked_after": 0
    }
  ],
  "payment": {
    "amount": 5,
    "contract_sha256": "9dd386eac42953f1bff33f6af3a728ecd78a8f1ed79dfb04d0dc333823315816",
    "currency": "USD",
    "idempotency_key": "chat-1791494833438-2-attempt-0",
    "job_id": "job-432780117bf35dd4",
    "ledger": "Central marketplace SQLite ledger; IDs are scoped to this marketplace",
    "offer_id": "offer-scout-python-code",
    "result_sha256": "b73946cc49575cc2f63e532fef4af7faa508fdc5d19b68ea5aaeaf0aee5867c4",
    "seller_id": "scout",
    "session_id": "session-dfd9cdc9edf85d20",
    "simulated_payments": true,
    "state": "PAID",
    "transactions": [
      {
        "action": "ESCROW_LOCKED",
        "amount": 5,
        "created": 1791494833.7500222,
        "created_at": "2026-10-08T21:27:13.750022+00:00",
        "currency": "USD",
        "from_account": "available",
        "from_wallet": "session-dfd9cdc9edf85d20",
        "id": "lux-tx-308",
        "job_id": "job-432780117bf35dd4",
        "ledger_id": 308,
        "session_id": "session-dfd9cdc9edf85d20",
        "to_account": "locked",
        "to_wallet": "session-dfd9cdc9edf85d20"
      },
      {
        "action": "PAYMENT_RELEASED",
        "amount": 5,
        "created": 1791494852.9715457,
        "created_at": "2026-10-08T21:27:32.971546+00:00",
        "currency": "USD",
        "from_account": "locked",
        "from_wallet": "session-dfd9cdc9edf85d20",
        "id": "lux-tx-310",
        "job_id": "job-432780117bf35dd4",
        "ledger_id": 310,
        "session_id": "session-dfd9cdc9edf85d20",
        "to_account": "available",
        "to_wallet": "scout"
      }
    ],
    "verification_receipts": [
      "delivery-dcc80bf1bb55c95b149b89f6"
    ]
  },
  "public_key": {
    "alg": "Ed25519",
    "id": "ppk-1eec83b33164f1bd",
    "public_key_pem": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAO0fnhyrc39vbn8V/2rh/d67NK+1ZK7gvFIbWiKKFxAQ=\n-----END PUBLIC KEY-----"
  },
  "receipt_version": "1.0",
  "reconciliation": {
    "balanced": true,
    "escrow_locked": 5,
    "movements": 3,
    "price": 5,
    "settled": 5
  },
  "session": {
    "budget": 110,
    "created": 1791493891.466604,
    "created_at": "2026-10-08T21:11:31.466604+00:00",
    "fixture": "buggy",
    "id": "session-dfd9cdc9edf85d20",
    "service": "auto",
    "title": "Summarize this text: The account budget now reaches the turn and the wallet it creates."
  },
  "signature": {
    "alg": "ed25519-sha256",
    "created_at": "2026-10-08T21:27:32.992998+00:00",
    "key_id": "ppk-1eec83b33164f1bd",
    "payload": "{\"amount\":5,\"contract_sha256\":\"9dd386eac42953f1bff33f6af3a728ecd78a8f1ed79dfb04d0dc333823315816\",\"currency\":\"Lux Coins\",\"idempotency_key\":\"chat-1791494833438-2-attempt-0\",\"job_id\":\"job-432780117bf35dd4\",\"offer_id\":\"offer-scout-python-code\",\"payload_version\":\"1.0\",\"result_sha256\":\"b73946cc49575cc2f63e532fef4af7faa508fdc5d19b68ea5aaeaf0aee5867c4\",\"seller_id\":\"scout\",\"session_id\":\"session-dfd9cdc9edf85d20\",\"settled_at\":\"2026-10-08T21:27:32.971546+00:00\",\"state\":\"PAID\",\"transactions\":[{\"action\":\"ESCROW_LOCKED\",\"amount\":5,\"created_at\":\"2026-10-08T21:27:13.750022+00:00\",\"id\":\"lux-tx-308\"},{\"action\":\"PAYMENT_RELEASED\",\"amount\":5,\"created_at\":\"2026-10-08T21:27:32.971546+00:00\",\"id\":\"lux-tx-310\"}],\"verification_receipts\":[\"delivery-dcc80bf1bb55c95b149b89f6\"]}",
    "payload_sha256": "c824969dea1ab8c1bfca91f7b9e4e89ae90fde9f51f608c6b32816c451140012",
    "value_base64": "EPRC5DuBcOgEO+2NRtM+lP8+QXQ1DSrK8HCJGVi466Hh+0XuL4mmVkqJu0SBNVNXzf9DVoBOBH6y1eaXrdlmAA=="
  },
  "simulated_payments": true,
  "timeline": [
    {
      "action": "LUX_COINS_ISSUED",
      "amount": 40,
      "available_after": 40,
      "created": 1791493891.4674048,
      "created_at": "2026-10-08T21:11:31.467405+00:00",
      "id": "lux-tx-302",
      "job_id": null,
      "kind": "issue",
      "label": "Test credits issued to the buyer wallet",
      "ledger_id": 302,
      "locked_after": 0
    },
    {
      "action": "ESCROW_LOCKED",
      "amount": 2,
      "available_after": 38,
      "created": 1791493891.6933017,
      "created_at": "2026-10-08T21:11:31.693302+00:00",
      "id": "lux-tx-303",
      "job_id": "job-e741095971cf22af",
      "kind": "escrow",
      "label": "Funds locked in escrow for the job",
      "ledger_id": 303,
      "locked_after": 2
    },
    {
      "action": "RESULT_DELIVERED",
      "amount": 0,
      "available_after": 38,
      "created": 1791493893.1499104,
      "created_at": "2026-10-08T21:11:33.149910+00:00",
      "id": "lux-tx-304",
      "job_id": "job-e741095971cf22af",
      "kind": "delivery",
      "label": "Seller delivery recorded by the marketplace",
      "ledger_id": 304,
      "locked_after": 2
    },
    {
      "action": "PAYMENT_RELEASED",
      "amount": 2,
      "available_after": 38,
      "created": 1791493893.3349595,
      "created_at": "2026-10-08T21:11:33.334960+00:00",
      "id": "lux-tx-305",
      "job_id": "job-e741095971cf22af",
      "kind": "payment",
      "label": "Escrow released to the seller after verification",
      "ledger_id": 305,
      "locked_after": 0
    },
    {
      "action": "TOPUP_ISSUED",
      "amount": 25,
      "available_after": 63,
      "created": 1791494077.0501988,
      "created_at": "2026-10-08T21:14:37.050199+00:00",
      "id": "lux-tx-306",
      "job_id": null,
      "kind": "issue",
      "label": "Wallet topped up with simulated USD",
      "ledger_id": 306,
      "locked_after": 0
    },
    {
      "action": "TOPUP_ISSUED",
      "amount": 25,
      "available_after": 88,
      "created": 1791494679.941018,
      "created_at": "2026-10-08T21:24:39.941018+00:00",
      "id": "lux-tx-307",
      "job_id": null,
      "kind": "issue",
      "label": "Wallet topped up with simulated USD",
      "ledger_id": 307,
      "locked_after": 0
    },
    {
      "action": "ESCROW_LOCKED",
      "amount": 5,
      "available_after": 83,
      "created": 1791494833.7500222,
      "created_at": "2026-10-08T21:27:13.750022+00:00",
      "id": "lux-tx-308",
      "job_id": "job-432780117bf35dd4",
      "kind": "escrow",
      "label": "Funds locked in escrow for the job",
      "ledger_id": 308,
      "locked_after": 5
    },
    {
      "action": "RESULT_DELIVERED",
      "amount": 0,
      "available_after": 83,
      "created": 1791494852.8604712,
      "created_at": "2026-10-08T21:27:32.860471+00:00",
      "id": "lux-tx-309",
      "job_id": "job-432780117bf35dd4",
      "kind": "delivery",
      "label": "Seller delivery recorded by the marketplace",
      "ledger_id": 309,
      "locked_after": 5
    },
    {
      "action": "PAYMENT_RELEASED",
      "amount": 5,
      "available_after": 83,
      "created": 1791494852.9715457,
      "created_at": "2026-10-08T21:27:32.971546+00:00",
      "id": "lux-tx-310",
      "job_id": "job-432780117bf35dd4",
      "kind": "payment",
      "label": "Escrow released to the seller after verification",
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