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.
關于協議修訂的問題，ETH和EOS團隊都有權利對協議條款進行修改。但是ETH對條款進行修改后需要ETH團隊和買方共同簽字執行（電子郵件和電子簽名都不被接受）。
但是EOS協議僅表述為修改后的協議一經上傳，立刻生效，不需要買方認可。
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