{
  "manageEntity": {
    "action": "Save",
    "entityId": "602133467",
    "entityType": "Track",
    "nonce": "0xf892e59288b89ee1a3221849ef0c91ca1c889f5e44f3ffadcd244640353f8d02",
    "signature": "0x20f33409a3789eae975c6ba791a6466800c320280d4da2fbb60dfc770ca3067a4d5afc8f92c3383a88b3504015553fa872b1b9d7e1606d236a4f6e17a3ba0e201c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}