{"type":"excalidraw","version":2,"source":"https://AwesomeSystemDesign.dev","elements":[{"angle":0,"strokeColor":"#6577aa","backgroundColor":"#eef1fc","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-1"}],"updated":0,"link":null,"locked":false,"id":"shape-0","type":"rectangle","seed":41,"x":36,"y":32,"width":264.05644,"height":68,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-1","type":"text","seed":114,"x":56,"y":54.3,"width":224.05644,"height":23.400000000000002,"fontSize":18,"fontFamily":1,"text":"Account | Debit | Credit","originalText":"Account | Debit | Credit","textAlign":"center","verticalAlign":"middle","containerId":"shape-0","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#628572","backgroundColor":"#edf5ee","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-2"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-3"}],"updated":0,"link":null,"locked":false,"id":"shape-2","type":"rectangle","seed":187,"x":340.05644,"y":32,"width":283.51804000000004,"height":106.2,"customData":{"revealStep":2}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-2"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-3","type":"text","seed":260,"x":360.05644,"y":50,"width":243.51804000000004,"height":70.2,"fontSize":18,"fontFamily":1,"text":"network:visa | $29.99\nmerchant:acme | | $28.82\nplatform:fees | | $1.17","originalText":"network:visa | $29.99\nmerchant:acme | | $28.82\nplatform:fees | | $1.17","textAlign":"center","verticalAlign":"middle","containerId":"shape-2","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":2}},{"angle":0,"strokeColor":"#a68a53","backgroundColor":"#fff7e6","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-3"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-5"}],"updated":0,"link":null,"locked":false,"id":"shape-4","type":"rectangle","seed":333,"x":36,"y":178.2,"width":291.03556000000003,"height":68,"customData":{"revealStep":3}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-3"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-5","type":"text","seed":406,"x":56,"y":200.5,"width":251.03556000000003,"height":23.400000000000002,"fontSize":18,"fontFamily":1,"text":"TOTAL | $29.99 | $29.99","originalText":"TOTAL | $29.99 | $29.99","textAlign":"center","verticalAlign":"middle","containerId":"shape-4","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":3}},{"angle":0,"strokeColor":"#9180ac","backgroundColor":"#f4effb","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-4"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-7"}],"updated":0,"link":null,"locked":false,"id":"shape-6","type":"rectangle","seed":479,"x":367.03556000000003,"y":178.2,"width":264.05644,"height":68,"customData":{"revealStep":4}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-4"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-7","type":"text","seed":552,"x":387.03556000000003,"y":200.5,"width":224.05644,"height":23.400000000000002,"fontSize":18,"fontFamily":1,"text":"Account | Debit | Credit","originalText":"Account | Debit | Credit","textAlign":"center","verticalAlign":"middle","containerId":"shape-6","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":4}},{"angle":0,"strokeColor":"#6577aa","backgroundColor":"#eef1fc","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-5"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-9"}],"updated":0,"link":null,"locked":false,"id":"shape-8","type":"rectangle","seed":625,"x":333.58832000000007,"y":286.2,"width":280.57972,"height":68,"customData":{"revealStep":5}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-5"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-9","type":"text","seed":698,"x":353.58832000000007,"y":308.5,"width":240.57972,"height":23.400000000000002,"fontSize":18,"fontFamily":1,"text":"TOTAL | $15.00 | $15.00","originalText":"TOTAL | $15.00 | $15.00","textAlign":"center","verticalAlign":"middle","containerId":"shape-8","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":5}},{"angle":0,"strokeColor":"#628572","backgroundColor":"#edf5ee","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-6"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-11"}],"updated":0,"link":null,"locked":false,"id":"shape-10","type":"rectangle","seed":771,"x":36,"y":286.19999999999993,"width":257.58832,"height":106.2,"customData":{"revealStep":6}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-6"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-11","type":"text","seed":844,"x":56,"y":304.19999999999993,"width":217.58832,"height":70.2,"fontSize":18,"fontFamily":1,"text":"merchant:acme | $14.42\nplatform:fees | $0.58\nnetwork:visa | | $15.00","originalText":"merchant:acme | $14.42\nplatform:fees | $0.58\nnetwork:visa | | $15.00","textAlign":"center","verticalAlign":"middle","containerId":"shape-10","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":6}},{"angle":0,"strokeColor":"#a68a53","backgroundColor":"#fff7e6","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-7"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-13"}],"updated":0,"link":null,"locked":false,"id":"shape-12","type":"rectangle","seed":917,"x":36,"y":432.3999999999999,"width":603.01688,"height":478,"customData":{"revealStep":7}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-7"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-13","type":"text","seed":990,"x":56,"y":450.3999999999999,"width":563.01688,"height":442,"fontSize":17,"fontFamily":1,"text":"Why Double-Entry Bookkeeping Is Non-Negotiable\n\nSingle-entry (naive):\n\"Merchant ACME received $29.99\"\n→ Where did the money come from? Where did the fee go?\n→ How do you verify nothing is missing?\n→ How do you reconcile with bank statements?\n\nDouble-entry:\nEvery transaction has EQUAL debits and credits:\n\nPayment of $29.99 (fee: $1.17):\n\nRefund of $15.00:\n\nInvariant: SELECT SUM(debit) - SUM(credit) FROM ledger = 0\nIf ever non-zero → something is broken → ALERT IMMEDIATELY\n\nThis invariant is checked continuously (every 5 min).\nIt catches bugs, race conditions, and data corruption.","originalText":"Why Double-Entry Bookkeeping Is Non-Negotiable\n\nSingle-entry (naive):\n\"Merchant ACME received $29.99\"\n→ Where did the money come from? Where did the fee go?\n→ How do you verify nothing is missing?\n→ How do you reconcile with bank statements?\n\nDouble-entry:\nEvery transaction has EQUAL debits and credits:\n\nPayment of $29.99 (fee: $1.17):\n\nRefund of $15.00:\n\nInvariant: SELECT SUM(debit) - SUM(credit) FROM ledger = 0\nIf ever non-zero → something is broken → ALERT IMMEDIATELY\n\nThis invariant is checked continuously (every 5 min).\nIt catches bugs, race conditions, and data corruption.","textAlign":"left","verticalAlign":"middle","containerId":"shape-12","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":7}}],"appState":{"viewBackgroundColor":"#fbfbf8","gridSize":null},"files":{}}