--- excalidraw-plugin: parsed tags: [excalidraw] --- ==⚠ Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠== # Text Elements Mineral comes out of the ground ^DG2MSniZ Wholesaler ^XClsOfzM Manufacturer ^pGNYVhjr Manufacturer ^CRwxAbGF Certificate ^k6eEBTji Certificate ^KB3IjPdQ Certificate ^HF7626x4 Certificate ^cLckZ9Jj Certificate ^UqiUZ9y5 Certificate (duplicate) ^cgaJCMyf Certificate (duplicate) ^cJhdlhw7 Double spend problem: The wholesaler could provide the same certificate to different manufacturers. How do we prevent double spend? Audit of the wholesaler => show me what you bought and what you sold Do they add up? (structure + tech solution) Wholesaler are honest (ontological solution ...) NB: you could also worry about generation of "fake" certificates but this seems trivially solvable by having the issuing authority digitally sign their certificates and publish their public key. ^H2TZXU2p "Illegal" metals ^VCinCbQQ NB: "authority" and trust for the initial certificate issuance logically HAS to be outside of blockchain. Blockchain can NOT address "trust" here. ^mhWAXKZt Phone ^SVgUyQzn Phone ^2UMTpHri Supply Chain Tracing ^1LU7A4M2 What's the problem? I want to know what went into my phone and where it came from? E.g. re there "conflict minerals" in there? How much co2 was involved ... ^wxcn01tW Stage 1: Mining ^C618fKjp Stage 2: Aggregation ^BSJxcM2U Stage 3: Manufacturing ^oSh4ZZoK Stage 4: Consumer ^YK0fin9l Phone is planet friendly! ^G6GJGRw8 !! Phone seems planet friendly but is NOT! ^jctG5kXf How is Blockchain/DLT relevant? 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"strokeColor": "#000000", "backgroundColor": "transparent", "width": 624, "height": 286, "seed": 1933785135, "groupIds": [], "strokeSharpness": "sharp", "boundElements": [], "updated": 1647589722961, "link": null, "fontSize": 17.4211387434555, "fontFamily": 1, "text": "Double spend problem: The wholesaler could provide\nthe same certificate to different manufacturers.\n\nHow do we prevent double spend?\n\nAudit of the wholesaler => show me what you bought and what you sold\nDo they add up? (structure + tech solution)\n\nWholesaler are honest (ontological solution ...)\n\nNB: you could also worry about generation of \"fake\" certificates\nbut this seems trivially solvable by having the issuing authority\ndigitally sign their certificates and publish their public key.", "rawText": "Double spend problem: The wholesaler could provide\nthe same certificate to different manufacturers.\n\nHow do we prevent double spend?\n\nAudit of the wholesaler => show me what you bought and what you sold\nDo they add up? (structure + tech solution)\n\nWholesaler are honest (ontological solution ...)\n\nNB: you could also worry about generation of \"fake\" certificates\nbut this seems trivially solvable by having the issuing authority\ndigitally sign their certificates and publish their public key.", "baseline": 279, "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Double spend problem: The wholesaler could provide\nthe same certificate to different manufacturers.\n\nHow do we prevent double spend?\n\nAudit of the wholesaler => show me what you bought and what you sold\nDo they add up? (structure + tech solution)\n\nWholesaler are honest (ontological solution ...)\n\nNB: you could also worry about generation of \"fake\" certificates\nbut this seems trivially solvable by having the issuing authority\ndigitally sign their certificates and publish their public key." }, { "type": "text", "version": 64, "versionNonce": 1017307977, "isDeleted": false, "id": "VCinCbQQ", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": -896.376953125, "y": 162.24493823625653, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 149, "height": 25, "seed": 1070523969, "groupIds": [], "strokeSharpness": "sharp", "boundElements": [], "updated": 1647589722961, "link": null, "fontSize": 20, "fontFamily": 1, "text": "\"Illegal\" metals", "rawText": "\"Illegal\" metals", "baseline": 18, "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "\"Illegal\" metals" }, { "type": "arrow", 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How is it better or worse\nthan other solutions (e.g. centralized DB or honest wholesalers)", "baseline": 60, "textAlign": "center", "verticalAlign": "top", "containerId": null, "originalText": "How is Blockchain/DLT relevant? 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