{
  "manageEntity": {
    "action": "Save",
    "entityId": "1605311711",
    "entityType": "Track",
    "nonce": "0x43878af009c8339350a93bd886c90a1c734415886b0f2b59c17a4317f4a4edf8",
    "signature": "0x1dcd2c2685dde7dc664087bfe384a81c6fceb7b89c9d35cbe4851b512d9d64af208171ba820a659bf16d9c9716307862854584931ff3ea80a197e5ade5439a4e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}