{
  "manageEntity": {
    "action": "Save",
    "entityId": "7661",
    "entityType": "Track",
    "nonce": "0x75acde4d19c17ce22d81a91f303bb6b38ba1e4ae70143e86464a877bfbcf7ecd",
    "signature": "0x61ea80fb53e4410876da9f828373eeec21d425da03122b680f4e685c16f7cfe2074254043de9d65dbb65a99826d3a0259618c285c360eb49150f896b483267d81c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}