{
  "manageEntity": {
    "action": "Save",
    "entityId": "1987737829",
    "entityType": "Track",
    "nonce": "0xf8c3ab5dcd1ffe366b21ddfed9fd2abf6b2fb70e0561c8aafc2265bfb9c91bb7",
    "signature": "0x3458738f83ea84b4e47f58673d9eeb9ed92704b2699bbdc9e0ded3f6e6de47197a5bf818a1283bfa411f38492f7f975bf8a36a2d9456ece364bc0dbaacb5f1511c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}