{
  "manageEntity": {
    "action": "Save",
    "entityId": "1220774170",
    "entityType": "Track",
    "nonce": "0x73253db8546d5b08c3e2b304dec59449e31b61f8aeebb9a5cdc1a6b559d6a27c",
    "signature": "0x1fbfb5183409ed6c46301c903a4a07917a7bbbbf4c44bff4db86a7b85a4c41cf221325dd4e6521d1c4bec1d6be5c195ead9e8b89fa30f7d0e9ae7ca26a8fa2ff1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}