{
  "manageEntity": {
    "action": "Save",
    "entityId": "18475954",
    "entityType": "Track",
    "nonce": "0x2318f2a94821d2bf56775fe9e97fc509ae87ff39c154e6fc381696a7f29ea731",
    "signature": "0x66259ea22f525e9b89f5997f455adec7838b401e597094d2492cbfe2635c019a5131105cdda453d7fc6d5e314453a0715971943ea28ac6dd3c7b7a3c9811f6e71c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}