{
  "manageEntity": {
    "action": "Save",
    "entityId": "1299524820",
    "entityType": "Track",
    "nonce": "0x221f447f21f9fc54946d1983d7f069d822015356d0380d2c6e41f5e0aad9342a",
    "signature": "0xdc655afb0e0896e9a5aef1fcf5e3bf3659544bde9a9d3288dccf48bc9823050a60e8e1e4208f953c1eeeed746185a1a853bdef2cf5fe470790698da1507864541c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}