![]() When the fork reached full enforcement (July 2015), it required strict DER encoding of all ECDSA signatures in new blocks as described in BIP66. Version 3 blocks were introduced in Bitcoin Core 0.10.0 (February 2015) as a soft fork. Also described in BIP34 are rules for rejecting certain blocks based on those rules, Bitcoin Core 0.7.0 and later versions began to reject version 2 blocks without the block height in coinbase at block height 224,412 (March 2013) and began to reject new version 1 blocks three weeks later at block height 227,930. As described in BIP34, valid version 2 blocks require a block height parameter in the coinbase. Version 2 was introduced in Bitcoin Core 0.7.0 (September 2012) as a soft fork. Version 1 was introduced in the genesis block (January 2009). The hashes are in internal byte order the other values are all in little-endian order. ![]() If all 32-bit values are tested, the time can be updated or the coinbase transaction can be changed and the merkle root updated. See the nBits format described below.Īn arbitrary number miners change to modify the header hash in order to produce a hash less than or equal to the target threshold. Full nodes will not accept blocks with headers more than two hours in the future according to their clock.Īn encoded version of the target threshold this block’s header hash must be less than or equal to. Must be strictly greater than the median time of the previous 11 blocks. The block time is a Unix epoch time when the miner started hashing the header (according to the miner). The merkle root is derived from the hashes of all transactions included in this block, ensuring that none of those transactions can be modified without modifying the header. This ensures no previous block can be changed without also changing this block’s header.Ī SHA256(SHA256()) hash in internal byte order. See the list of block versions below.Ī SHA256(SHA256()) hash in internal byte order of the previous block’s header. The block version number indicates which set of block validation rules to follow. Block headers are serialized in the 80-byte format described below and then hashed as part of Bitcoin’s proof-of-work algorithm, making the serialized header format part of the consensus rules.
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