{
  "manageEntity": {
    "action": "Save",
    "entityId": "207544",
    "entityType": "Track",
    "nonce": "0x72a6368de55ae98a40c7e775ce52aec32d9a969ca001d9ba8ac471492cfa1e64",
    "signature": "0x16d3bf0854aea4f0c9d93c7cf96e181a26a980b0159b7fabd72e40115ab40bb20a6e672bec276a4c828a34b3c91c1842e1ad5eaed0f9ef83a92caa195beb9e851c",
    "signer": "0x8739aB96B52ccc56d0E5226Ff69659162d4269A9",
    "userId": "320952162"
  }
}