{
  "manageEntity": {
    "action": "Save",
    "entityId": "197419149",
    "entityType": "Track",
    "nonce": "0xfa3f1fe133600007f5de479be187fc38d314b39c89b74d99d042566a89a602e5",
    "signature": "0x2a9a521acedac88b5f1e1c7e4ea8ba6957f491ff4929a6356a2632278233032102ddddfc7b2ef2e43d80d1cee7a574ba06119993b18505a3ed066678ee7821061c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}