{
  "manageEntity": {
    "action": "Save",
    "entityId": "495000568",
    "entityType": "Track",
    "nonce": "0xd6c3d9780c80673189d33bcc81b652831b12219e316813e87073925753b51f15",
    "signature": "0x73bc2f7e2ddd9220a08d52ff918410db910a5293a6fb56bbea7a8a9e05413b455e08dd8dc2e68406d864d0166bd14e5567383fb2dad97b65cd8b07d77f9400711c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}