a) ETH 原文：EthSuisse reserves the right, at its sole discretion, to change, modify, add, or remove portions of the Terms and Ether Product Purchase Agreement, at any time during the sale by posting the amended Terms on the Ethereum website (https://www.ethereum.org). Any Purchaser will be deemed to have accepted such changes by purchasing ETH.
The Terms may not be otherwise amended except in a signed writing executed by both the Purchaser and EthSuisse. For purposes of this agreement, "writing" does not include an e-mail message and a signature does not include an electronic signature.
b) EOS原文：Modification of Agreement. Company may modify this Agreement at any time by posting a revised version on the Website, available at https://eos.io/purchase_agreement. The modified terms will become effective upon posting. It is Buyer’s responsibility to check the Website regularly for modifications to this Agreement. This Agreement was last modified on the date listed at the beginning of this Agreement.
关于协议修订的问题，ETH和EOS团队都有权利对协议条款进行修改。但是ETH对条款进行修改后需要ETH团队和买方共同签字执行（电子邮件和电子签名都不被接受）。
但是EOS协议仅表述为修改后的协议一经上传，立刻生效，不需要买方认可。
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