BIP34: clarify encoding for early blocks

bip-0034.mediawiki

@@ -6,7 +6,7 @@
   Status: Deployed
   Type: Specification
   Assigned: 2012-07-06
-  Version: 1.0.3
+  Version: 1.0.4
 </pre>
 
 ==Abstract==
@@ -22,6 +22,7 @@ Bitcoin blocks and transactions are versioned binary structures. Both currently
 
 # Treat transactions with a version greater than 1 as non-standard (official Satoshi client will not mine or relay them).
 # Add height as the first item in the coinbase transaction's scriptSig, and increase block version to 2. The format of the height is "minimally encoded serialized CScript" -- first byte is number of bytes in the number (will be 0x03 on main net for the next 150 or so years with 2<sup>23</sup>-1 blocks), following bytes are little-endian representation of the number (including a sign bit).  Height is the height of the mined block in the block chain, where the genesis block is height zero (0).
+# For new chains (such as [[bip-0325.mediawiki|signet]] or [[bip-0094.mediawiki|testnet4]]) that enforce this rule immediately after the genesis block, "minimally encoded serialized CScript" results in a different encoding for blocks at heights 1-16: those values must be encoded as the single byte 0x51 to 0x60 (<code>OP_1..OP_16</code>), with no "number of bytes" prefix. Note that the minimum length of the coinbase transaction's scriptSig is two bytes, so the height push alone is insufficient for blocks 1-16. In addition, this BIP never applies to the genesis block.
 # 75% rule: If 750 of the last 1,000 blocks are version 2 or greater, reject invalid version 2 blocks. (testnet3: 51 of last 100)
 # 95% rule ("Point of no return"): If 950 of the last 1,000 blocks are version 2 or greater, reject all version 1 blocks. (testnet3: 75 of last 100)
 
@@ -39,6 +40,7 @@ Block number 227,835 (timestamp 2013-03-24 15:49:13 GMT) was the last version 1
 
 ==Changelog==
 
+* 1.0.4: 2026-11-04: clarify encoding for early blocks
 * 1.0.3: 2020-11-18: clarify that encoding must be minimal
 * 1.0.2: 2016-02-05: correction to format prediction regarding sign bit
 * 1.0.1: 2016-02-01: updated to Final, logged activation block