{
  "manageEntity": {
    "action": "Save",
    "entityId": "603919254",
    "entityType": "Track",
    "nonce": "0x541145553b1f73fe3af0cde659c62e4ca7ac98914c3ee1c5a511d28b7973e4ef",
    "signature": "0xb066a88ef92ef618a0e45d9aaadb5f1ec4a83059397662dd56cf9db8b8456b8c1e1e365ed23aa42372e784f2aac0746a05433dbe84646ecb61bfb5667165c89a1b",
    "signer": "0xdA0eFB0e7b973C487c12501759aDb23012CB5248",
    "userId": "178070"
  }
}