{
  "manageEntity": {
    "action": "Save",
    "entityId": "652778775",
    "entityType": "Track",
    "nonce": "0x316b6f4cd14dd4115a9f2ff924ff08400c37bac6dc080e3f2627f2f0939228a3",
    "signature": "0x3a42d5fc9d03740212b2aa7ba2480b0459d3df794dc532e40f362afbfdf461797e7e4c69f59f3ef03f3eaada9d611ef63ec79c03863baca0a148a777d5e5447a1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}