{
  "manageEntity": {
    "action": "Save",
    "entityId": "408958817",
    "entityType": "Track",
    "nonce": "0xf7f5cf949a0aa3e52c4747385c2812efde5cb37b006048238db57fddca6a785c",
    "signature": "0x58282269caa161c162307d8f3377b4c10d6229c2a5edf05c71bca818413266b2029dac6d0f94a2f92e7e478f679eb9b40e7acd69a93987b6626c6a94e205f6b41b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}