{
  "manageEntity": {
    "action": "Save",
    "entityId": "466607",
    "entityType": "Track",
    "nonce": "0x3fa46c5deead8389ca5a5ca60267522eb92d454f2737c4406c7536024b5478e3",
    "signature": "0xd8f15f20451227ff8a8bb5e5abe66a0d2cf832a0e79a624ee95ec4d04a96f7ac10cec66a64d2bb4e76c79f92a6cc4f52ba6d83c096d02fbae20a2f8057137f401b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}