1C81BGyi8SJ919UxnHm2iwNmaN2RHfU4us

P2PKH (1)

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Quantum exposure Reuse-exposed

P2PKH · reuse-exposed

P2PKH addresses hide the pubkey behind a SHA-256 + RIPEMD-160 hash UNTIL the first outgoing spend, which reveals it in the signature script or witness data. This address has been spent from, so its pubkey is permanently on chain. Every subsequent UTXO at this address is just as exposed as the moment of first spend.

First revealed at block 559,736 on 2019-01-23 (input_spend).

Context: Bitcoin quantum exposure report · Top exposed addresses · Quantum and Bitcoin (LearnBitcoin.com)

What we know about this address 3 findings ✓ corroborated by 3 sources

huobipool reward address (coinbase-extracted)

Received block rewards as part of huobipool's coinbase output across 1171 block(s) between heights 580413 and 656243. Attribution derived from on-chain coinbase scriptSig tag matching plus Jameson Lopp's blocks.csv mapping; this is hard evidence the address received pool rewards under that pool's signature, not clustering inference.

mining-pool view
Huobi.com-2 (Exchanges)

Address attributed to 'Huobi.com-2' on walletexplorer.com (category: Exchanges). Balance 0.0000 BTC across 1191 incoming txs; last used in block 932,706.

exchange view
miners_additional

Tagged as 'miners_additional' in GraphSense pack 'miners_additional' (category: miner, confidence: unspecified). Cited source: https://github.com/MatteoRomiti/Deep_Dive_BTC_Mining_Pools/

mining pool view