{
  "manageEntity": {
    "action": "Save",
    "entityId": "284612",
    "entityType": "Track",
    "nonce": "0x78a8695b576e3ce9f9e41d28811f38e5bf86427aa62e86c300b4cd0e6289a629",
    "signature": "0x921b4519daefb3289c4199eaa2f8fef520883c749a69c97f02847b4ca8a0af476eea4376d240b9b77f3f8ed5577c43e48063fbb32da0f03fdccad243b6de5b961b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}