{
  "manageEntity": {
    "action": "Save",
    "entityId": "283688103",
    "entityType": "Track",
    "nonce": "0xab73a45d745c84a9e631a22baa434b5607610de03a301cee96de494a796f9922",
    "signature": "0x89d9da5185f8297b02f6b1601322b1141edb155ce9cbd75dceb54946e65c3ba30b5db2ad7eeb4aeed667e6e3aab8ca0fc28e901db6cf70e4d2d403be87220a981b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}