{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421882812",
    "entityType": "Track",
    "nonce": "0xd8d541f0f404b894ec52e795973f9040968ede7554c449288de46a9eb7cfdf99",
    "signature": "0xacf98804295131cefd5a8bdb6a2db86943d5243972739026bff6c7b38002d19b794cba00bdebe54d6ffa9b58fbcfcb8a119cedf78b760adea68dd55fbbca819e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}