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BIP34 specifies it requires minimal encoding.

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Non minimal encodings are rejected by the bitcoin-core client because it 
only checks against a specific encoding
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Greg-Griffith 2020-11-18 12:17:04 -08:00
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commit 08844fd6ef
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@ -22,7 +22,7 @@ Bitcoin blocks and transactions are versioned binary structures. Both currently
==Specification==
# 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 "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).
# 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).
# 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)