# \#security

**URL:** https://improve.xmtp.org/tag/security/17.md

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## [XIP Idea: Cross-Chain Address Validation & Preventing Same-Address Phishing](https://improve.xmtp.org/t/xip-idea-cross-chain-address-validation-preventing-same-address-phishing/3557)

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**Author:** [@Maivar](https://improve.xmtp.org/u/Maivar)\
**Replies:** 0\
**Last updated:** [July 13, 2026, 4:39pm UTC](https://improve.xmtp.org/t/xip-idea-cross-chain-address-validation-preventing-same-address-phishing/3557 "2026-07-13T16:39:41Z")

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The Problem: Cross-Chain Identity Spoofing As XMTP expands toward full cross-chain messaging support, it introduces a massive vector for address-spoofing and phishing attacks. Malicious actors routinely deploy smart cont…

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## [XIP Idea: Protocol-Level Sybil Resistance & Metadata Obfuscation](https://improve.xmtp.org/t/xip-idea-protocol-level-sybil-resistance-metadata-obfuscation/2581)

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**Author:** [@Maivar](https://improve.xmtp.org/u/Maivar)\
**Replies:** 1\
**Last updated:** [July 1, 2026, 2:26pm UTC](https://improve.xmtp.org/t/xip-idea-protocol-level-sybil-resistance-metadata-obfuscation/2581 "2026-07-01T14:26:09Z")

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1. The Sybil & Phishing Attack Vector Client-side filtering like “Smart Inbox” is just a band-aid. Web3 messaging without economic friction is structurally flawed. With zero cost to initiate communication, the protocol r…