{
  "manageEntity": {
    "action": "Save",
    "entityId": "138851321",
    "entityType": "Track",
    "nonce": "0xd9e24108f86ba91aa1b78fa2ea642887d4f23ba89c74c59d0d5c846e448d9ef6",
    "signature": "0xe1b1b6239e56f1ad7c63ff3502e000f8b33840d9eab6c3ba8cf8391474ebc44c206340cb2eeb6ac729b99ffecd86d35443473719eaf32ed54a3fc28e782cb0bf1c",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}