{
  "manageEntity": {
    "action": "Save",
    "entityId": "1749523534",
    "entityType": "Track",
    "nonce": "0x4523de735ad10776444c4c4b2fca77b1bf3b0c7450440ef3c5d7c1e8fd0d45d9",
    "signature": "0xcaef46dc840275ed8bc1cb73b44a3646e22dbab7e1038f13c7c8cdd37f2ab5ef3921fc0b9d4f0fbafd6e2988359a1d0c5d284e9d6cb6134ebc0d8924772cfaca1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}