{
  "manageEntity": {
    "action": "Save",
    "entityId": "770066",
    "entityType": "Track",
    "nonce": "0x43c7b8d530c40c92bcaa9194b0fed87d87b65a1783c09463796cc881095a0c81",
    "signature": "0xc44cc5de9f36292bbc830e24e9b69ffcd531fa992afdee009fd00e74c7a364c64d76d385457dc5b27b4e41947c39727ec9e56146ac01119a72cbcdaa98d7e6841c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}