Social Replay Exploit
Why Broadcasting on One Chain Can Drain Both
Shared UTXOs + social deception
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1. Before the Fork – Shared Reality
🔗
ONE BLOCKCHAIN
💰
1 BTC
#abc123…
UNSPENT
👩🏻
ALICE
1.00000000 BTC
🟢
CHAIN X
LIVE
💰
1 BTC
#abc123…
UNSPENT
👩🏻
ALICE
1.00000000 BTC
🧔
BOB
0.00000000 BTC
Send me your fork coins on X only!
Won’t touch your BTC on Y!
🔵
CHAIN Y
LIVE
💰
1 BTC
#abc123…
UNSPENT
👩🏻
ALICE
1.00000000 BTC
🧔
BOB
0.00000000 BTC
SIGNED TX
Input
UTXO #abc123… 1 BTC
Output
→ Bob 1 BTC
✅ VALID ON BOTH CHAINS
Before the Fork – Shared Reality
One blockchain. Alice holds a single 1 BTC UTXO identical on both future chains.