{
  "manageEntity": {
    "action": "Save",
    "entityId": "135898",
    "entityType": "Track",
    "nonce": "0x01e4ba9e2ebbe12ebc6208449c839048907418514cab7735cdd561535a5a8d2b",
    "signature": "0x444a80031d4ea8a92484f5fa7d4655405879ab74b4cdde4ba8e4b7f96ce38674201518508a420aa7065c081e111c831cca655cf11b2f5becc949cdebcd690f0e1b",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}