past October in Las Vegas and I have no intention of starting a flame war. You should consult following sources: - PHP m/coinspark/php-OP_return - Python consult m/maraoz/proofofexistence for examples - Services for example Proof of existence - Java/bitcoinj consult this bitcoinj group thread. Bitcoin-core, currently handles OP_return without any problems. These bytes comprise the arbitrary less-than-40 bytes you are allowed to send in a transaction marked comment utiliser bitcoin wallet by the OP_return opcode.
I recall columns from late 2001 gasping in amazement how a bubble could have possibly created US13 billion in online advertising revenue and how that could never happen again. Yet, the Web has created trillions of dollars of wealth and social media has created hundreds of billions of dollars in its own sector. This first byte it followed by a byte which represents the length of the rest of the bytes in the scriptPubKey. It was also possible to create checkmultisig transactions which have similar implications. OP_return scripts are limited to 40 bytes, this is enough for a SHA-256 checksum (32 bytes) with 8 bytes of prefix or for a shortened URL There can be only one OP_return per transaction OP_returns are stored in blockchain, but they are not utxos. The folks I feel sorry for are the new users who bought in at US1,000 on the upside hype of the initial Wall Street dipping of toe in the water, then sold in a panic at US180 and will curse themselves and perhaps buy. Moreover, in most cases the coins used to write messages were destroyed.
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