{
  "manageEntity": {
    "action": "Save",
    "entityId": "1308221612",
    "entityType": "Track",
    "nonce": "0x0d5de429a703d7fbfa2fad0480ddfe649004b04d615d7580069381c6b574f0dc",
    "signature": "0x287468d4febf6e4df8978f179762dd32e902d1fed6d1fba39a79ad27a3ba29683242a16d02f19739fa6ec60606fbef5e86b4643dee4be943f6dc6021f4425c0c1b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}