{
  "manageEntity": {
    "action": "Save",
    "entityId": "1873406708",
    "entityType": "Track",
    "nonce": "0x59c6695d6dabf7aef58b58bf06f1894650acf14e9a530c0739bdbeca8e6e5efc",
    "signature": "0xea570d52c82f8ca428a2af763fa7d7478c2ed447d05af6bb53614f7278c25dd4438af41fb94de112104d4ed591c69362b6de580c10ebe191a9041ce7c0e8ee011c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}