diff --git a/config/default.toml b/config/default.toml
index 84c731e..57b8e53 100644
--- a/config/default.toml
+++ b/config/default.toml
@@ -90,9 +90,20 @@ bind       = "127.0.0.1:9091"
 # ── Chainlink price feeds (per chain, per asset symbol) ───────────────────
 # Only feeds listed here are polled by the PriceCache. Add more as new
 # Venus markets become relevant. Feed addresses from docs.chain.link.
+#
+# Note on BTCB: docs.chain.link historically advertised the 8-decimal
+# proxy 0x264990fb…1f0 as "BTC / USD" on BSC, but that address has no
+# bytecode on mainnet today (decimals()/latestRoundData() abi-decode
+# garbage). The address used below was discovered by walking Venus's
+# ResilientOracle (0x6592b5DE…) → ChainlinkOracle facet (0x1B210344…)
+# → tokenConfigs(BTCB) and then verified to be Chainlink-owned by
+# matching its `owner()` (0xcb6754D5…) against the BNB/USD canonical
+# feed's owner. It is an 18-decimal aggregator; PriceCache reads
+# `decimals()` per feed and `CachedPrice::scaled_to` rescales, so the
+# 8-vs-18 difference is invisible to consumers.
 [chainlink.bnb]
 BNB  = "0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE"
-BTCB = "0x264990fbd0A4796A3E3d8E37022BdAf1A5a4C1f0" # BTC / USD (canonical, docs.chain.link)
+BTCB = "0x8ECF7dE377F788A813F5215668E282556b35f300" # BTC / USD — 18-dec AggregatorV3, Chainlink-ops-owned (#109)
 ETH  = "0x9ef1B8c0E4F7dc8bF5719Ea496883DC6401d5b2e"
 USDT = "0xB97Ad0E74fa7d920791E90258A6E2085088b4320"
 USDC = "0x51597f405303C4377E36123cBc172b13269EA163"
diff --git a/config/fork.toml b/config/fork.toml
index d542a5f..9a3efad 100644
--- a/config/fork.toml
+++ b/config/fork.toml
@@ -96,7 +96,7 @@ bind    = "127.0.0.1:9091"
 # Mainnet feed addresses resolve against the fork.
 [chainlink.bnb]
 BNB  = "0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE"
-BTCB = "0x264990fbd0A4796A3E3d8E37022BdAf1A5a4C1f0"
+BTCB = "0x8ECF7dE377F788A813F5215668E282556b35f300" # BTC / USD — 18-dec AggregatorV3, Chainlink-ops-owned (#109)
 ETH  = "0x9ef1B8c0E4F7dc8bF5719Ea496883DC6401d5b2e"
 USDT = "0xB97Ad0E74fa7d920791E90258A6E2085088b4320"
 USDC = "0x51597f405303C4377E36123cBc172b13269EA163"