{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999119518",
    "entityType": "Track",
    "nonce": "0x255cef3fa2601e4c6567c85363e03b4801f4aa79021db8ffaef33c6baf3be962",
    "signature": "0xe81e6f6d4cb727af5e71e1a711ef7a5aba5c6b11db452030c8d99173af034c65668f2c737a032a07c88a82f4d28a50dabda853856c81cef8fd141b81b5ec4bd51c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}