{
  "manageEntity": {
    "action": "Save",
    "entityId": "152891213",
    "entityType": "Track",
    "nonce": "0x7ca4eff336c194ec606ba33b3b89bd295c72a4122b1e97d0e2a130b53372caaa",
    "signature": "0xa756c2a1c36863bb4f8fb7c2935f673ff12c858e9ffe92feb77f5ff7284a4a347c0b128f7ebb19419195160b110e04ac5bee4a1d1296557a537028d8cd4b74401c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}