{
  "manageEntity": {
    "action": "Save",
    "entityId": "1218595498",
    "entityType": "Track",
    "nonce": "0x0b050b546ea36496f37e5dc4b52cb407cd4a022788e09c519efeafb843c7c6aa",
    "signature": "0x54bc642a72b57ec0ebffb0f9d38fd2523d7e82f4991b579b09f7a02cfacfd5d97c5435058db3db1c8af8cc756f131976e171f8cfd0d05a55ba7746eeae42a6e21c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}