{
  "manageEntity": {
    "action": "Save",
    "entityId": "445542978",
    "entityType": "Track",
    "nonce": "0xfa729f6d66583f7ca2fbf365da8b9eadbde8acd39566d95376d4aebee7f38c00",
    "signature": "0x634a9dfb5000e864e561e536438f0cf4aa30e3b143f75cdedde47ac514dd09cf0545ae58830268811f9f0f43fc5692d5dc64c8f05ca96d27681312cc3bd139371c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}