{
  "manageEntity": {
    "action": "Save",
    "entityId": "657803751",
    "entityType": "Track",
    "nonce": "0xfe288233d1fb2638f9a6417788e8e744cbd6f4613e869f5d23c2251d859a1763",
    "signature": "0xcc3feef89fd04814850a2517fc145884575fb9ccfaf3316194182c092d4bed8a0e5954e2e4732517d8c857c5a6d9f63ae2ec748da157a3341bf4cebd8ef2d22b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}