{
  "manageEntity": {
    "action": "Save",
    "entityId": "537261237",
    "entityType": "Track",
    "nonce": "0x2f003f047a7dcff57f97e90fc953f48ac9b6af47849d43b22d36ddf0d1bd78b1",
    "signature": "0x5f99f589b2267cc00b0e2dd23af182b188e83851b7780434e7da4d71d762a3b77fc9e4d2d1f400d71110f2c91ffa29dc11fe62d1fc7f2a6c82d577b541292dd01b",
    "signer": "0x4086Dda2D91F77cd46De0859a4de37F888508faA",
    "userId": "568518925"
  }
}