{
  "manageEntity": {
    "action": "Save",
    "entityId": "752646",
    "entityType": "Track",
    "nonce": "0xf16ec946abd0b9fa69836af885f47b37c7fced629d06d7bd2f53dfe918237cf0",
    "signature": "0xebfd31c0da6fa9b4d76a0b2755a88c145baebfce8061cfddbbaad53262c3c78a1678c0cfd8e9f2638aa20c3a6dff807c950865fcf0e84ffdf37a92dd8eaba5511b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}