{
  "manageEntity": {
    "action": "Save",
    "entityId": "1242696597",
    "entityType": "Track",
    "nonce": "0x19fd7e259002f43bac71b3e4a657e50a16d91d2ea3cfc4488da78df37440882a",
    "signature": "0x1dfb72429ff5eb54965a45193e6f60a58fcabb7e2998ee6aef4c3ff6a7b8ebcc18c9e799e1574032dd3d640107c40db2ccf1543ff6f31e16a8b647d5a998ab7e1b",
    "signer": "0x3e48DC5763519fbdE0A26db7C59929E8Bb6B8Fe2",
    "userId": "971129804"
  }
}