{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621062651",
    "entityType": "Track",
    "nonce": "0xdbd7c756792384bc142cd212edb7b76370899d8e473d5a18f5adcc32c913db5f",
    "signature": "0xa7665ffe6c252a36d1dcb2b0219c9d58ec7963e100988f7d926ca2712aa2d1f2396f55531aec05b25a464b4bf81d5ef7e16cf86029e687e83a11462963ef61e91c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}