Return first txid-matching transaction

[romanz]

Should resolve the ordering issue (returning the first matching tx), as well as not parsing the next blocks.

[romanz]

Tested manually:

$ echo '{"jsonrpc": "2.0", "method": "blockchain.transaction.get", "params": ["e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468", true], "id": 0}' | netcat 127.0.0.1 50001
{"id":0,"jsonrpc":"2.0","result":{"blockhash":"00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e","blocktime":1289723848,"confirmations":714144,"hash":"e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468","hex":"01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff060456720e1b00ffffffff0100f2052a01000000434104124b212f5416598a92ccec88819105179dcb2550d571842601492718273fe0f2179a9695096bff94cd99dcccdea7cd9bd943bfca8fea649cac963411979a33e9ac00000000","in_active_chain":true,"locktime":0,"size":133,"time":1289723848,"txid":"e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468","version":1,"vin":[{"coinbase":"0456720e1b00","sequence":4294967295}],"vout":[{"n":0,"scriptPubKey":{"asm":"04124b212f5416598a92ccec88819105179dcb2550d571842601492718273fe0f2179a9695096bff94cd99dcccdea7cd9bd943bfca8fea649cac963411979a33e9 OP_CHECKSIG","desc":"pk(04124b212f5416598a92ccec88819105179dcb2550d571842601492718273fe0f2179a9695096bff94cd99dcccdea7cd9bd943bfca8fea649cac963411979a33e9)#ss7pe7ny","hex":"4104124b212f5416598a92ccec88819105179dcb2550d571842601492718273fe0f2179a9695096bff94cd99dcccdea7cd9bd943bfca8fea649cac963411979a33e9ac","type":"pubkey"},"value":50.0}],"vsize":133,"weight":532}}

$ echo '{"jsonrpc": "2.0", "method": "blockchain.transaction.get", "params": ["d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599", true], "id": 0}' | netcat 127.0.0.1 50001
{"id":0,"jsonrpc":"2.0","result":{"blockhash":"00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f","blocktime":1289757588,"confirmations":714054,"hash":"d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599","hex":"01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff060456720e1b00ffffffff0100f2052a010000004341046896ecfc449cb8560594eb7f413f199deb9b4e5d947a142e7dc7d2de0b811b8e204833ea2a2fd9d4c7b153a8ca7661d0a0b7fc981df1f42f55d64b26b3da1e9cac00000000","in_active_chain":true,"locktime":0,"size":133,"time":1289757588,"txid":"d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599","version":1,"vin":[{"coinbase":"0456720e1b00","sequence":4294967295}],"vout":[{"n":0,"scriptPubKey":{"asm":"046896ecfc449cb8560594eb7f413f199deb9b4e5d947a142e7dc7d2de0b811b8e204833ea2a2fd9d4c7b153a8ca7661d0a0b7fc981df1f42f55d64b26b3da1e9c OP_CHECKSIG","desc":"pk(046896ecfc449cb8560594eb7f413f199deb9b4e5d947a142e7dc7d2de0b811b8e204833ea2a2fd9d4c7b153a8ca7661d0a0b7fc981df1f42f55d64b26b3da1e9c)#4pqpyumn","hex":"41046896ecfc449cb8560594eb7f413f199deb9b4e5d947a142e7dc7d2de0b811b8e204833ea2a2fd9d4c7b153a8ca7661d0a0b7fc981df1f42f55d64b26b3da1e9cac","type":"pubkey"},"value":50.0}],"vsize":133,"weight":532}}