{
  "manageEntity": {
    "action": "Save",
    "entityId": "2120261136",
    "entityType": "Track",
    "nonce": "0x19b3843540fb09bab97d0b95e0e39e7d02599f156786b9f9f53575cae195c4e2",
    "signature": "0x584a73ee1643ab1e6c50cbfc2270398a292dc9f665e93a044f2e7ea439acb34a1c763a3a21487160872b5b498d61c8bf266e7e10a56886ee8757242c4438c4e81c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}