{
  "manageEntity": {
    "action": "Save",
    "entityId": "1187966457",
    "entityType": "Track",
    "nonce": "0x3ffc360c7ebd70750ed7ac465aaea1c7bcb13da6b5dd88c78abfd0035ecda898",
    "signature": "0xe69f571d3effca98553d0cdb2631aded4bc4e6a7a0a33fd383e1bc37da8ab7906702f9864c51ab2641e15ad72a259b5c942fc7b3b3681d0445189447cde3aace1b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}