{
  "manageEntity": {
    "action": "Save",
    "entityId": "212896575",
    "entityType": "Track",
    "nonce": "0x06db23935a136453bdd137129c33cce7a2744b8d54ce82a8591cf093cb459faf",
    "signature": "0x780d596388ce09654ef56c59eeedc3523872b1aba6081fc02e0d485b9bb2b0fb26a97e799008f63fcc44ccb475d7f6a77dee88105d1559dd46e399f4869e4a881b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}