{
  "manageEntity": {
    "action": "Save",
    "entityId": "272812539",
    "entityType": "Track",
    "nonce": "0x0b13e442a856da9f64666b69edeed3a6e6fa8500de6fdf927cfb9779b244c148",
    "signature": "0xd6e68d2772723b5e6e405494f69062ad440b04757fe74b04898f24c1f19ba0c440f5a644cc9ad33c42a8b3e6c04aeff1fb8416ad14b3b4cff79eb291bdcd9d131b",
    "signer": "0xdDBB4aBaD51C5A5deEBCcDA911F4514b0F5FdED1",
    "userId": "146690675"
  }
}