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m7 op return update

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This has been right in the code, but I kept forgetting to update the BIP.
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Paul Sztorc 2018-04-23 20:50:11 -04:00 committed by GitHub
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bip-blind-merged-mining.mediawiki
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@ -85,12 +85,12 @@ Mainchain nodes are going to need this data later, so it must be easy to find. W
==== M7 -- "Blind-Mine the Sidechain(s)" ====
Thus, (for n sidechains) we have a coinbase output with:
Thus, (for n sidechains) we have a coinbase output with multiple OP_RETURNs (we've changed the tx-standardness policy to allow multiple OP_RETURNs):
1-byte - OP_RETURN (0x6a)
1-byte - Push the following (4+(n*35)) bytes (0x??)
1-byte - Push the following 39 bytes (0x27)
4-byte - Message header (0xD3407053)
(n*(32+5))-byte - A sequence of bytes, of the three Mini-Header items (h*, prevBlockRef, ChainIndex).
37-byte - A sequence of bytes, of the three Mini-Header items (h*, prevBlockRef, ChainIndex).
( We assume that 5 bytes are used for the Critical Data bytes (non h* parts of the Sidechain Mini-Header). For 256 sidechains, a total of 9,478 bytes [1+1+4+256\*(32+5)] are required, conveniently just below the 10 KB scriptPubKey size limit.)