{
  "manageEntity": {
    "action": "Save",
    "entityId": "669832901",
    "entityType": "Track",
    "nonce": "0x7be2bcbe2222c156985e6d1788d7f79b36f957e8864581def80b073a2bf14cf7",
    "signature": "0xb9629a3f8e50c6ff782dd0d6b051c886b5f1a1b0d10bc5864975546e80a252c20e2d693460b575ded0ea4a80f23c96d8ee9820a6cb848ad511e69fcbe8a07bff1b",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}