{
  "manageEntity": {
    "action": "Save",
    "entityId": "912141546",
    "entityType": "Track",
    "nonce": "0x7620851d1f563c4f75b7283343fe1be832572f42f446d87abf3ded71bbbbace4",
    "signature": "0x1c182d925c112753194382fb2f3a2a566b2ef596d646c09177208bf16c6b860d4f78652175eb609c4c31662bcb4cec28e70469f51cc48984f066f10b1a71e8461b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}