{
  "manageEntity": {
    "action": "Save",
    "entityId": "778921105",
    "entityType": "Track",
    "nonce": "0xa5e3e649ecd22c00ba199ccf474cc7db3ad1507688fc643ee73359f8a30cb52e",
    "signature": "0x5f7591e18cbb701cad7518a981e112725ed32a98a6307e647072cd51c1519fb87db162cac143fa63fcb76f5ad4490ea97f5c3017ad145ebf4516eda8b5afb9961b",
    "signer": "0x05D4434893815F914255C028DF9Da0a3e11FE0E8",
    "userId": "181835656"
  }
}