{
  "manageEntity": {
    "action": "Save",
    "entityId": "359775584",
    "entityType": "Track",
    "nonce": "0x58b80c52b3699914a64e7c1dd9fe1cc87ea5a931d42e6208062031d38d27fa0a",
    "signature": "0xfb8eeae932a8c321809b69eaf936f4e03aa2664a5eaecb8b2ac63077cf7e20e029f77965f0ac95053100a456f5f5984e2e6edad6367d762a4d8a7211682b46601c",
    "signer": "0xF4d72ab7AeC2F5C6F14b2D78Ac07400f637E8187",
    "userId": "97788201"
  }
}