{
  "manageEntity": {
    "action": "Save",
    "entityId": "1219007108",
    "entityType": "Track",
    "nonce": "0x42af837bb8ddf24d0f69b570b5dcea76138ffffaf507b80cad285ad8a7209d7a",
    "signature": "0xb5e12637be5f9e3dc456b0be23f5de69a4a12242e64139df3f9ecacaabfd156e3855b57ab1242c893b6326c65304d6e63a1248d3eb96adbb9d8d3e0c70d2a8421b",
    "signer": "0xb1B522e4c290853bC2ABb1D802d311A7EB1e696B",
    "userId": "94334210"
  }
}