{
  "manageEntity": {
    "action": "Save",
    "entityId": "603054565",
    "entityType": "Track",
    "nonce": "0x9d9a6c193c21ed958e632400a5bd0953dcb62e4443198cd1a86b456135ce9298",
    "signature": "0x4370da0673ba5c923604c942023ce7ccca58364a38a1be42cc3f2f8c59170f704207590b72e6e34add51d35f7baa588232405aa33973fb55a46f88d5ea50d1bf1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}