{
  "manageEntity": {
    "action": "Save",
    "entityId": "742464",
    "entityType": "Track",
    "nonce": "0x3d2530742ef71bfd08abdc69ebeea36b141d33cd130b6cfd28be29c584a06518",
    "signature": "0x800351cfc5faa86f22172960a3190fb7c49929b4d07554dd00c5c2ee526579bd50f0e6612e837c182bfa5e28d71d62f1d8d99f9cfe39dcf6b361b6a78b2a35f71b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}