{
  "manageEntity": {
    "action": "Save",
    "entityId": "350290448",
    "entityType": "Track",
    "nonce": "0x5221ede2a470b131bfcc5271153e8a35a58e8ec0c8384a63c4a560a535a7af6d",
    "signature": "0x235052e99c7e9602f7ee8f4dd07563a2b32b67e0cb6ae590eb1f6546dd716d915520450ab99c9be8dfca589afb038fdc0505cdb9c3beb10bb734ef1b634898471b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}