{
  "manageEntity": {
    "action": "Save",
    "entityId": "338943495",
    "entityType": "Track",
    "nonce": "0x75c7ef92015ec35143669b0c0fa07abcb73910092e020e69fe9d07cfa05589bd",
    "signature": "0xfe5af7a81d865b65c4ca7600d4392e820109ec09466fc00b6d527b7eb096c0e3009ef9ae84a0464a38c39aca47d5b2826517353092da3db26cecf5d73eda2d851b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}