{
  "manageEntity": {
    "action": "Save",
    "entityId": "764237269",
    "entityType": "Track",
    "nonce": "0xd29c4628ae449d6711100c9906d7f01681fbf9e9a53685e1a0ede8d5617b7e4f",
    "signature": "0xe9aedb82a9aa3ac2cf4a0878c9624df1d45f95e8cf206931ffc3d0a92efcc900580b8e8e2908fc3f9d6135c65182f6cdab7306c1f25be695d0787b7d195e043b1c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}