ECDSA Bitcoin, Ethereum, Dash, Litecoin, Zcash, Ripple, Byteball Signature 128 bits Brok en (Shor) 256 bits 520 bits RSA-1024 - Signature, Encryption 80 bits Broken (Shor) 1024 bits 1024 bits An Ethereum transaction - as in, what you pass to sendRawTransaction() - consists of the following fields, in order and RLP-encoded (note that the field names are not part of the encoded data):. nonce - transaction sequence number fr the sending account; gasprice - price you are offering to pay ; startgas - maximum amount of gas allowed for the transaction I've written a small script that will create a bitcoin transaction from scratch, using an ECDSA library. It works, but sometimes I get this error: 64: non-mandatory-script-verify-flag (Non-canonical signature: S value is unnecessarily high) I found this reply answer on bitcoin talk: The signature is composed of two values, the r value and the s ... With bitcoin, a hard fork would be necessary to change defining parameters such as the block size, the difficulty of the cryptographic puzzle that needs to be solved, limits to additional ... An ECC (ECDSA, ECDH, ECMQV, etc) key is always relative to some 'curve' (more exactly, prime-order subgroup over a curve with an identified generator aka base point). For bitcoin this is secp256k1, but your question doesn't say it's limited to bitcoin and this answer would require modification for other applications using other curves.
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