{
  "manageEntity": {
    "action": "Save",
    "entityId": "423571290",
    "entityType": "Track",
    "nonce": "0x3f7a60faf397028d29eea4d0096a8b7cdecbff0c48eb9cada5c3b96cbba70b1c",
    "signature": "0x147b8b06ba982442e16adb531f4c08bda760900660e66c1d80201b2f47ad66334d0de90164a9c9d94938b6135cfd96d4cbabdb31883050d10aad9ca5ca32573a1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}