{
  "manageEntity": {
    "action": "Save",
    "entityId": "1451576778",
    "entityType": "Track",
    "nonce": "0xd19e42f39d73846da74a08043e550f2638d3eebec8bb68fe2bfc995370a63403",
    "signature": "0xc4350af495ddae2d3fcd2a72bb0286c3ebdc09bb827c09ed6d31326ef55d08a62d7b06b3069c725065a10ad5fcaf72e5bcbef5f12edd3c34a8513345b80d8d0f1c",
    "signer": "0x28945B345Dc8334c21B4e932dA506ca6Fac7e18a",
    "userId": "290283513"
  }
}