{
  "manageEntity": {
    "action": "Save",
    "entityId": "588821",
    "entityType": "Track",
    "nonce": "0xda7b31ed5c36d2511009e953c62ec6d774b92069f8be39403074fb96ee88955d",
    "signature": "0xb978da93c8da5115d9365e1ea8ab8a86c8b5d0b5a0308380d177f2d6cf934c607b837a352e2af93ba86b0774e67bcc9c055efd504abbd5d0852d0f3f519727171c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}