{
  "manageEntity": {
    "action": "Save",
    "entityId": "138345643",
    "entityType": "Track",
    "nonce": "0x304acd935d2a1a52aa4682d8f5ac8acea05c4164a37f25c4ecfec9d356ec2545",
    "signature": "0x49fa23d6e9c94aec54d878a3e58ab19da7fff299a5dd734ed76cc696c4ab140965239876ba4b3bfc2c92be92f56748baaa8ab792e3175f03bb1637aada68637b1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}