{
  "manageEntity": {
    "action": "Save",
    "entityId": "285851050",
    "entityType": "Track",
    "nonce": "1791868631489663813",
    "signature": "0xe8707780fa894f567d4d9ecda8679f6e49784e0f70e9e93ad3ea34198a6937b07b86ff4489a38996fc01bfc5844b5d1923a79b8fe59f6cb8991d9b4abd4158901c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}