Jing's mining node will then add a 4-byte timestamp, encoded as a Unix "epoch" timestamp, which is based on the number of seconds elapsed from January 1, 1970, midnight UTC/GMT. The time +1388185914+ is equal to Friday, 27 Dec 2013, 23:11:54 UTC/GMT.
Jing's mining node will then add a 4-byte timestamp, encoded as a Unix "epoch" timestamp, which is based on the number of seconds elapsed since midnight UTC, Thursday, January 1, 1970. The time +1388185914+ is equal to Friday, December 27, 2013, 23:11:54 UTC.
Jing's node then fills in the target, which defines the required Proof-of-Work to make this a valid block. The target is stored in the block as a "target bits" metric, which is a mantissa-exponent encoding of the target. The encoding has a 1-byte exponent, followed by a 3-byte mantissa (coefficient). In block 277,316, for example, the target bits value is +0x1903a30c+. The first part +0x19+ is a hexadecimal exponent, while the next part, +0x03a30c+, is the coefficient. The concept of a target is explained in <<target>> and the "target bits" representation is explained in <<target_bits>>.
Will Binns
5 years ago
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