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client-validation-removal.excalidraw
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"text": "SendPacket from Chain A: Not receivable by Chain B\n\nSendPacket from Chain B: Receivable by Chain C\nReceivable by Chain A. This token is double spent into a misconfigured chain\nSending from A back to B will fail. Thus it is only redeemable by Chain C\n\nSendPacket from Chain C: Receivable by Chain B\nReceivable by Chain D. This token is double spent into a misconfigured chain.\nSending from D back to C will fail. Thus it is redeemable only by Chain B\n\nOther packet flow messages passing will require coincidences.\nSuppose Chain A and Chain C sends the exact same SendPacket\nThe chain C packet will be receivable by Chain B which writes an ACK\nBoth chain C and chain A will acknowledge the packet as if it is meant for them\nbut only chain C acknowledgement logic is valid\n",
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"originalText": "What does this require?\nCoincidence of identifier for clients. Chain A and Chain C\nuse same client identifier for chain B\nChain D and chain B use the same client identifier for chain C\nCoincidence of identifiers in connection identifiers\nCoincidence of timing in the Connection Handshake. e..g. B-C connection\nhandshake cannot be complete before chain A starts handshake\nCoincidence of identifiers in the channel identifiers\nCoincidence of timing in the Channel Handshake\n\nFull packet flow is only possible on valid connection/channel\nPartial flows possible only on misconfigured chains\nFull packet flow only possible on misconfigured chains if there\nis simultaneously a coincidence of valid packet flow\n\nChain B and Chain C are never confused about who they are\ntalking to.\nTheir respective escrow accounts are safe.",
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