{
  "manageEntity": {
    "action": "Save",
    "entityId": "306575",
    "entityType": "Track",
    "nonce": "0xae19b1833f5fa7768b9d9f5b3150fd8bb48d1139ba5ef6c37211c6c3753bc857",
    "signature": "0x76f120b8af5ab2d59581fc8e3e9f0fbbc4cc33bb3e9bf08910244e224035228579ddebddf82e60a616a3e62d9beaf4da50f05e8e5cf28bb8e65b3c2da142ab121c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}