{
  "manageEntity": {
    "action": "Save",
    "entityId": "880337693",
    "entityType": "Track",
    "nonce": "0xaeaf9611d88b2500bb90349e287111245fa535449a4684edae51c96da1dd6623",
    "signature": "0x57aca63c7bd9e437616e67a6e455c10fd6353b1add6b94ce12805ab92e767273269c9849e0bd869b872b4d279a5721229c4f7e6401f8ac63c87fbaf5ba094d591b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}