What version of php are you using? This was mentioned a few months back on github:
https://github.com/blockcypher/php-client/issues/1I did some work for someone with an Arch linux server, was forced to downgrade php version to get it to work, it seems their API breaks against some upgrades.
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Thanks for the pointer. That issue resolved after upgrading the version, but a new one has popped up. Now it is throwing...
Fatal error: Uncaught exception 'BlockCypher\Exception\BlockCypherSignatureException' with message '1 private keys do not correspond to any input. Please check private keys provided.' in /www/myserver.com/blockcypher1/php-client/blockcypher/php-client/lib/BlockCypher/Api/TXSkeleton.php:148 Stack trace: #0 /www/myserver.com/blockcypher1/php-client/blockcypher/php-client/lib/BlockCypher/Api/TXSkeleton.php(96): BlockCypher\Api\TXSkeleton->generateSignatures(Object(BlockCypher\Crypto\PrivateKeyList), 'btc') #1 /www/myserver.com/blockcypher1/php-client/blockcypher/php-client/lib/BlockCypher/Client/TXClient.php(35): BlockCypher\Api\TXSkeleton->sign(Array, 'btc') #2 /www/myserver.com/blockcypher1/send.php(19): BlockCypher\Client\TXClient->sign(Object(BlockCypher\Api\TXSkeleton), Array) #3 {main} thrown in
/www/myserver.com/blockcypher1/php-client/blockcypher/php-client/lib/BlockCypher/Api/TXSkeleton.php on
line 148But, I have provided unencrypted Hex private key of my address. Also tried with WIF. None is working!