{
  "manageEntity": {
    "action": "Save",
    "entityId": "804565958",
    "entityType": "Track",
    "nonce": "0xda4be844afc9941ac12c5a1a5a55d74d07db812b2ac50f0bb32b84f9006b41b2",
    "signature": "0x74de4435802b049b9a41de07f8afbcc43d5a90e3ebee9e2e451df39f880bec4f1a3f9b0d55ef5cf0a1b12d313df6890072576120c5d97651f1c4528f86e971341b",
    "signer": "0x6cf53cBFf67b220c22Cfce0D9EbAA3542a86295B",
    "userId": "147204"
  }
}