{
  "manageEntity": {
    "action": "Save",
    "entityId": "1545033104",
    "entityType": "Track",
    "nonce": "0x4de5372e1aa881e2e453a8865b13dde4dd20b372e18de06c9adf13a5abe03e24",
    "signature": "0x54d89457ea1cdbc7796cb4bc00db7e171b2f5c7b0ca9f53d41fb4b054011c9923ce3942dcaaf6ef5c5694b5d4e8ca117f9c66f611cbfe590cdc07491a2948aac1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}