{
  "manageEntity": {
    "action": "Save",
    "entityId": "1223640246",
    "entityType": "Track",
    "nonce": "0x738d5d46d430aa7eef7a95e173c5be1d6d66cc47f43ce10520188ddf46c6f68e",
    "signature": "0x973cfa53ac3494304723ea756662e61f98ecd618a097673212528c8d7522b9f806308d874b2966bfced4e802f4d28e7396501d312dcd961a0c3bb2c161a2a4841b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}