COLDCARD, CLN disclosures, zk proof of reserves - Bitcoin Optech Newsletter #416

stackernews-optech-416-thread

https://stacker.news/items/1536932

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Stacker News

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Community discussion

Published

2026-07-31

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Every check is recorded, including checks that found no text change. A detected edit is therefore bounded between two checks. The publisher's exact save time is not observable from this record. Last checked 7 Aug 2026, 00:04 UTC.

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   seen 4 Aug 2026, 04:15 UTC · Captured here 3,317 chars
   Extracted text as captured

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     "data": {
       "item": {
         "comments": {
           "comments": [
             {
               "createdAt": "2026-08-01T08:45:23.024Z",
               "text": "Cold cock that coin",
               "user": {
                 "name": "LAXITIVA"
               }
             },
             {
               "createdAt": "2026-08-01T07:04:13.728Z",
               "text": "Cold cock a cold one",
               "user": {
                 "name": "LAXITIVA"
               }
             }
           ]
         },
         "createdAt": "2026-07-31T13:18:41.879Z",
         "text": "Bitcoin Optech newsletter #416 is here:\n\n- warns about a severe vulnerability affecting wallets generated by COLDCARD signing devices\n- summarizes the disclosure of two denial-of-service vulnerabilities in Core Lightning\n- describes a proof of concept for a zero-knowledge proof of reserves\n- summarizes popular Q&A from Stack Exchange\n- Optech Newsletter #416 Podcast\nhttps://bitcoinops.org/en/newsletters/2026/07/31/\n\nIf you used a COLDCARD to generate a wallet, any funds received by that wallet are at risk of theft and should be carefully moved to an unaffected wallet as soon as possible...\nhttps://bitcoinops.org/en/newsletters/2026/07/31/#move-funds-secured-by-coldcard-generated-keys\n\nOn 30 July 2026, some Bitcoin users discovered that funds from their COLDCARD wallets had been stolen in a series of unexpected transactions on 29 July. Over the course of the day, a bug was identified in the firmware of the COLDCARD that causes wallets to be generated with insufficient entropy. As of this writing, estimated losses exceed 1,000 BTC, a figure that may continue to rise as the situation develops...\nhttps://bitcoinops.org/en/newsletters/2026/07/31/#wallets-generated-by-coldcard-at-risk-of-theft\n\nChandra Pratap posted to Delving Bitcoin about two denial-of-service (DoS) vulnerabilities he found in Core Lightning...\nhttps://bitcoinops.org/en/newsletters/2026/07/31/#disclosure-of-two-dos-vulnerabilities-in-core-lightning\n\nfabohax posted about zkPoH (“zero-knowledge proof-of-hodl”), a proof of concept for a non-custodial proof of reserves system for Bitcoin...\nhttps://bitcoinops.org/en/newsletters/2026/07/31/#proof-of-concept-for-a-zero-knowledge-proof-of-reserves\n\nSelected Q&A from Bitcoin Stack Exchange\n- What is Bitcoin’s objective definition of transaction neutrality?\n- Why does BIP110’s decentralization benefit not outweigh its impact on transaction neutrality?\n- Why does BIP110 require a 55% signaling threshold if its nodes reject non-signaling blocks?\n- Why use ElligatorSwift encoding in BIP324?\n- Was the OP_SUCCESSx reservation in BIP342 designed with specific opcode families in mind?\n- What is the difference between the long-term feerate and the discard feerate?\n- What is the quickest method for migrating a legacy wallet to a descriptor wallet on a pruned node?\n- Is there historical data on orphan/stale block rates during high-fee periods?\nhttps://bitcoinops.org/en/newsletters/2026/07/31/#selected-qa-from-bitcoin-stack-exchange\n\nBitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.",
         "title": "COLDCARD, CLN disclosures, zk proof of reserves - Bitcoin Optech Newsletter #416",
         "user": {
           "name": "schmidty"
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