{
  "manageEntity": {
    "action": "Save",
    "entityId": "148395473",
    "entityType": "Track",
    "nonce": "0x0ba50447bb8e4a35a650faccefa276bcd4c9d954e797b8231be455b13f22ad64",
    "signature": "0x751faf47f9da1a79922b8aaf850abe6449566f1da6bdb0e32f6394cdd8871e6d36ef25097ec9ee3013472eb331561b8da4b8013357d638f957cbdba64e2801351c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}