{
  "manageEntity": {
    "action": "Save",
    "entityId": "2120922773",
    "entityType": "Track",
    "nonce": "0x0c5f30dece2a6d80fddcb93c740c5e33c861b51a5f1b34daa66455c60f476f73",
    "signature": "0xf73f45d1c7a75047c74c8507cd668f6a96b8959fa4fecda335a6c8bf25edf1a54605c711047ac5ce3ba52859ab025a649d3aeba5db7960e6a6cb6802608be7031b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}