{
  "manageEntity": {
    "action": "Save",
    "entityId": "642548169",
    "entityType": "Track",
    "nonce": "0x87b9b5bc6af5927c199ff0472a27f30e2d668c7faaadcf2a920ea08cebf327cb",
    "signature": "0x3a4f6a705fa7138373ae23115c3d1f3187376a2d16ef869d795ccb7da3e9777477142d57d8a061ab726ad7cd35af050bcc2b71d29e59ef9752742def0fc7f4fa1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}