{
  "manageEntity": {
    "action": "Save",
    "entityId": "25028",
    "entityType": "Track",
    "nonce": "0x2a3fd51e120a01d70497cac6a955830bb8bf3978091ab5bd460d04a2512a95df",
    "signature": "0x439e9e1f9bdb97c499ea3a72c7fd1d30fdfa269924696840edc0cddc2ae20dc2095aa6684217bba3c7e33937ec3aa6f3b42a6f1d04a7415ec10d14d54b4901ca1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}