{
  "manageEntity": {
    "action": "Save",
    "entityId": "421048",
    "entityType": "Track",
    "nonce": "0xbe3172da3cb1fc3cc2b280e379b9e1657023b70cad877ab9db64607c4f5f1249",
    "signature": "0xc39ad782f424f47554252732b07a7fd0eb7cf3d27f606e124a2a84a79d66bca73170ec2af9760d83dade2f7022309c6c9ece69dab1e3e7f36c4546e41d580b921b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}