{
  "manageEntity": {
    "action": "Save",
    "entityId": "1592580444",
    "entityType": "Track",
    "nonce": "0x961566370309bccda460fc281bd51b6615ed01023057bcf6298955814cbf66c7",
    "signature": "0x2e713546d2bfff22f8e99846166701a8898e1f4f6c6fa495699d2f269172eccc6518b57a089db66bc0033591e8794262f3f20b6db1687d14388e6d73b6318ec11c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}