{
  "manageEntity": {
    "action": "Save",
    "entityId": "200857",
    "entityType": "Track",
    "nonce": "0xe6a4aa4775f9a7c4dc2a12c22242ba733108f13ae9a1739dea12df6dc236d792",
    "signature": "0xdc3a5cb3efd2b7e98e92c2670fd06494fd2bdb950639d5d94a33b90775cf4a2455a0c678278b2460aedb7bc5356b9639f2cbbf2fb44aad933896959161814c9a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}