{
  "manageEntity": {
    "action": "Save",
    "entityId": "1208973318",
    "entityType": "Track",
    "nonce": "0xd4459cc5e43c70f43bf6417eab4f59d3658da52d2e77364e3a8e16a789a02a1a",
    "signature": "0x5dd5902e14ccc55cbc3e46e6f29810664cd72feb252c93668e70da75391c89f20402e5f7b5e37de17c7fb7164a6cce61d3afd8b5c7afc0b37b2e655fd71dc02c1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}